hy The HXD95: a modified Bassett-type hydrothermal diamond-anvil cell for in situ XRD experiments up to 5 GPa and 1300 K By scripts.iucr.org Published On :: 2020-01-29 A new diamond-anvil cell apparatus for in situ synchrotron X-ray diffraction measurements of liquids and glasses, at pressures from ambient to 5 GPa and temperatures from ambient to 1300 K, is reported. This portable setup enables in situ monitoring of the melting of complex compounds and the determination of the structure and properties of melts under moderately high pressure and high temperature conditions relevant to industrial processes and magmatic processes in the Earth's crust and shallow mantle. The device was constructed according to a modified Bassett-type hydrothermal diamond-anvil cell design with a large angular opening (θ = 95°). This paper reports the successful application of this device to record in situ synchrotron X-ray diffraction of liquid Ga and synthetic PbSiO3 glass to 1100 K and 3 GPa. Full Article text
hy Limited angle tomography for transmission X-ray microscopy using deep learning By scripts.iucr.org Published On :: 2020-02-13 In transmission X-ray microscopy (TXM) systems, the rotation of a scanned sample might be restricted to a limited angular range to avoid collision with other system parts or high attenuation at certain tilting angles. Image reconstruction from such limited angle data suffers from artifacts because of missing data. In this work, deep learning is applied to limited angle reconstruction in TXMs for the first time. With the challenge to obtain sufficient real data for training, training a deep neural network from synthetic data is investigated. In particular, U-Net, the state-of-the-art neural network in biomedical imaging, is trained from synthetic ellipsoid data and multi-category data to reduce artifacts in filtered back-projection (FBP) reconstruction images. The proposed method is evaluated on synthetic data and real scanned chlorella data in 100° limited angle tomography. For synthetic test data, U-Net significantly reduces the root-mean-square error (RMSE) from 2.55 × 10−3 µm−1 in the FBP reconstruction to 1.21 × 10−3 µm−1 in the U-Net reconstruction and also improves the structural similarity (SSIM) index from 0.625 to 0.920. With penalized weighted least-square denoising of measured projections, the RMSE and SSIM are further improved to 1.16 × 10−3 µm−1 and 0.932, respectively. For real test data, the proposed method remarkably improves the 3D visualization of the subcellular structures in the chlorella cell, which indicates its important value for nanoscale imaging in biology, nanoscience and materials science. Full Article text
hy The HARE chip for efficient time-resolved serial synchrotron crystallography By scripts.iucr.org Published On :: 2020-02-27 Serial synchrotron crystallography (SSX) is an emerging technique for static and time-resolved protein structure determination. Using specifically patterned silicon chips for sample delivery, the `hit-and-return' (HARE) protocol allows for efficient time-resolved data collection. The specific pattern of the crystal wells in the HARE chip provides direct access to many discrete time points. HARE chips allow for optical excitation as well as on-chip mixing for reaction initiation, making a large number of protein systems amenable to time-resolved studies. Loading of protein microcrystals onto the HARE chip is streamlined by a novel vacuum loading platform that allows fine-tuning of suction strength while maintaining a humid environment to prevent crystal dehydration. To enable the widespread use of time-resolved serial synchrotron crystallography (TR-SSX), detailed technical descriptions of a set of accessories that facilitate TR-SSX workflows are provided. Full Article text
hy The indexing ambiguity in serial femtosecond crystallography (SFX) resolved using an expectation maximization algorithm By journals.iucr.org Published On :: An expectation maximization algorithm is implemented to resolve the indexing ambiguity which arises when merging data from many crystals in protein crystallography, especially in cases where partial reflections are recorded in serial femtosecond crystallography (SFX) at XFELs. Full Article text
hy Structure and function of dioxygenases in histone demethylation and DNA/RNA demethylation By journals.iucr.org Published On :: The structure and function of dioxygenases in histone demethylation and DNA/RNA dimethylation are discussed. Full Article text
hy Binding site asymmetry in human transthyretin: insights from a joint neutron and X-ray crystallographic analysis using perdeuterated protein By journals.iucr.org Published On :: A neutron crystallographic study of perdeuterated transthyretin reveals important aspects of the structure relating to its stability and its propensity to form fibrils, as well as evidence of a single water molecule that affects the symmetry of the two binding pockets. Full Article text
hy Chemical crystallography and crystal engineering By journals.iucr.org Published On :: Today, there is very little doubt that chemistry owes as much to crystallography as crystallography does to chemistry. This mutual synergy defines modern chemical crystallography. Full Article text
hy Impacts on groundwater quality from abandoned hydrocarbon wells - GOV.UK By www.gov.uk Published On :: Tue, 22 Oct 2019 07:00:00 GMT Impacts on groundwater quality from abandoned hydrocarbon wells GOV.UK Full Article
hy Earth's North Magnetic Pole Keeps Drifting towards Siberia, Latest World Magnetic Model Shows | Geophysics, Geoscience - Sci-News.com By www.sci-news.com Published On :: Fri, 27 Dec 2019 08:00:00 GMT Earth's North Magnetic Pole Keeps Drifting towards Siberia, Latest World Magnetic Model Shows | Geophysics, Geoscience Sci-News.com Full Article
hy Researchers Describe Why Earth's Magnetic North Pole Is Straying Away From Canada Towards Siberia - The Digital Wise By thedigitalwise.com Published On :: Sat, 09 May 2020 06:54:00 GMT Researchers Describe Why Earth's Magnetic North Pole Is Straying Away From Canada Towards Siberia The Digital Wise Full Article
hy Scientists Explain Why Earth’s Magnetic North Pole Is Drifting Away From Canada Towards Siberia - Mashable India By in.mashable.com Published On :: Fri, 08 May 2020 13:10:00 GMT Scientists Explain Why Earth’s Magnetic North Pole Is Drifting Away From Canada Towards Siberia Mashable India Full Article
hy Why the UK's streets have turned silent during coronavirus lockdown - Express.co.uk By www.express.co.uk Published On :: Wed, 29 Apr 2020 07:00:00 GMT Why the UK's streets have turned silent during coronavirus lockdown Express.co.uk Full Article
hy Crystal structure of gluconate 5-dehydrogenase from Lentibacter algarum By scripts.iucr.org Published On :: 2020-04-29 Gluconate 5-dehydrogenase (Ga5DH; EC 1.1.1.69) from Lentibacter algarum (LaGa5DH) was recombinantly expressed in Escherichia coli and purified to homogeneity. The protein was crystallized and the crystal structure was solved at 2.1 Å resolution. The crystal belonged to the monoclinic system, with space group P1 and unit-cell parameters a = 55.42, b = 55.48, c = 79.16 Å, α = 100.51, β = 105.66, γ = 97.99°. The structure revealed LaGaDH to be a tetramer, with each subunit consisting of six α-helices and three antiparallel β-hairpins. LaGa5DH has high structural similarity to other Ga5DH proteins, demonstrating that this enzyme is highly conserved. Full Article text
hy Structure of the 4-hydroxy-tetrahydrodipicolinate synthase from the thermoacidophilic methanotroph Methylacidiphilum fumariolicum SolV and the phylogeny of the aminotransferase pathway By scripts.iucr.org Published On :: 2020-04-28 The enzyme 4-hydroxy-tetrahydrodipicolinate synthase (DapA) is involved in the production of lysine and precursor molecules for peptidoglycan synthesis. In a multistep reaction, DapA converts pyruvate and l-aspartate-4-semialdehyde to 4-hydroxy-2,3,4,5-tetrahydrodipicolinic acid. In many organisms, lysine binds allosterically to DapA, causing negative feedback, thus making the enzyme an important regulatory component of the pathway. Here, the 2.1 Å resolution crystal structure of DapA from the thermoacidophilic methanotroph Methylacidiphilum fumariolicum SolV is reported. The enzyme crystallized as a contaminant of a protein preparation from native biomass. Genome analysis reveals that M. fumariolicum SolV utilizes the recently discovered aminotransferase pathway for lysine biosynthesis. Phylogenetic analyses of the genes involved in this pathway shed new light on the distribution of this pathway across the three domains of life. Full Article text
hy Structure of P46, an immunodominant surface protein from Mycoplasma hyopneumoniae: interaction with a monoclonal antibody By journals.iucr.org Published On :: Structures of the immunodominant protein P46 from M. hyopneumoniae has been determined by X-ray crystallography and it is shown that P46 can bind a diversity of oligosaccharides, particularly xylose, which exhibits a very high affinity for this protein. Structures of a monoclonal antibody, both alone and in complex with P46, that was raised against M. hyopnemoniae cells and specifically recognizes P46 are also reported. Full Article text
hy Structural basis of carbohydrate binding in domain C of a type I pullulanase from Paenibacillus barengoltzii By journals.iucr.org Published On :: Full Article text
hy Macromolecular X-ray crystallography: soon to be a road less travelled? By journals.iucr.org Published On :: From the perspective of a young(ish) structural biologist who currently specialises in macromolecular X-ray crystallography, are the best years of crystallography over? Some evidence and hopefully thought-provoking analysis is presented here on the subject. Full Article text
hy 2,3-Dichloro-3',4'-dihydroxybiphenyl By scripts.iucr.org Published On :: 2019-05-14 The title compound [systematic name: 4-(2,3-Dichlorophenyl)benzene-1,2-diol], C12H8Cl2O2, is a putative dihydroxylated metabolite of 2,3-dichlorobiphenyl (PCB 5). The title structure displays intramolecular O—H⋯O hydrogen bonding, and the π–π stacking distance between inversion-related chlorinated benzene rings of the title compound is 3.371 (3) Å. The dihedral angle between two benzene rings is 59.39 (8)°. Full Article text
hy Polymeric poly[[decaaquabis(μ6-1,8-disulfonato-9H-carbazole-3,6-dicarboxylato)di-μ3-hydroxy-pentazinc] decahydrate] By scripts.iucr.org Published On :: 2019-05-14 The asymmetric unit of the title MOF, [Zn5(C14H5NO10S2)2(OH)2(H2O)10]n comprises three ZnII atoms, one of which is located on a centre of inversion, a tetra-negative carboxylate ligand, one μ3-hydroxide and five water molecules, each of which is coordinated. The ZnII atom, lying on a centre of inversion, is coordinated by trans sulfoxide-O atoms and four water molecules in an octahedral geometry. Another ZnII atom is coordinated by two carboxylate-O atoms, one hydroxy-O, one sulfoxide-O and a water-O atom to define a distorted trigonal–bipyramidal geometry; a close Zn⋯O(carboxylate) interaction derived from an asymmetrically coordinating ligand (Zn—O = 1.95 and 3.07 Å) suggests a 5 + 1 coordination geometry. The third ZnII atom is coordinated in an octahedral fashion by two hydroxy-O atoms, one carboxylate-O, one sulfoxide-O and two water-O atoms, the latter being mutually cis. In all, the carboxylate ligand binds six ZnII ions leading to a three-dimensional architecture. In the crystal, all acidic donors form hydrogen bonds to oxygen acceptors to contribute to the stability of the three-dimensional architecture. Full Article text
hy 1,3-Bis{[(2,6-dimethylphenyl)sulfanyl]methyl}benzene By scripts.iucr.org Published On :: 2019-05-24 The structure of the title compound, C24H26S2, an example of a pincer ligand with an SCS-chelation motif, illustrates the steric effects of the methyl groups in the thiophenyl rings at the 2- and 6-positions, forcing a dissimilar spatial orientation of the thiophenyl rings relative to the central aryl group [dihedral angles = 33.58 (7) and 40.49 (7)°]. In the crystal, weak S⋯S contacts [3.4009 (7) Å] link the molecules into inversion dimers. Full Article text
hy 6-Amino-2-iminiumyl-4-oxo-1,2,3,4-tetrahydropyrimidin-5-aminium sulfate monohydrate By scripts.iucr.org Published On :: 2019-05-17 The title compound, C4H9N5O2+·SO42−·H2O, is the monohydrate of the commercially available compound `C4H7N5O·H2SO4·xH2O'. It is obtained by reprecipitation of C4H7N5O·H2SO4·xH2O from dilute sodium hydroxide solution with dilute sulfuric acid. The crystal structure of anhydrous 2,4,5-triamino-1,6-dihydropyrimidin-6-one sulfate is known, although called by the authors 5-amminium-6-amino-isocytosinium sulfate [Bieri et al. (1993). Private communication (refcode HACDEU). CCDC, Cambridge, England]. In the structure, the sulfate group is deprotonated, whereas one of the amino groups is protonated (R2C—NH3+) and one is rearranged to a protonated imine group (R2C=NH2+). This arrangement is very similar to the known crystal structure of the anhydrate. Several tautomeric forms of the investigated molecule are possible, which leads to questionable proton attributions. The measured data allowed the location of all hydrogen atoms from the residual electron density. In the crystal, ions and water molecules are linked into a three-dimensional network by N—H⋯O and O—H⋯O hydrogen bonds. Full Article text
hy Dichlorido{N,N,N'-trimethyl-N'-(1H-pyrazol-1-yl-κN2)methyl]ethane-1,2-diamine-κ2N,N'}copper(II) methanol monosolvate By scripts.iucr.org Published On :: 2019-05-31 In the title compound, [CuCl2(C9H18N4)]·CH3OH, the central CuII ion is coordinated by three N atoms from the pyrazole derivative ligand and two chloride co-ligands. The coordination geometry around the CuII ion is distorted trigonal–bipyramidal. In the crystal, the molecules are linked by C—H⋯O, C—H⋯Cl and O—H⋯Cl hydrogen bonds, forming a three-dimensional framework with the lattice solvent molecule. Full Article text
hy Dodecan-1-aminium sulfate trihydrate By scripts.iucr.org Published On :: 2019-05-21 The asymmetric unit of the title salt, 2C12H28N+·SO42−·3H2O, contains two n-dodecylammonium cations, one sulfate anion and three water molecules. In the crystal, N—H⋯O hydrogen bonds link the cations and anions into layers parallel to (100). These layers are further connected through O—H⋯O hydrogen-bonding interactions involving the sulfate ions and the isolated water molecules. The three-dimensional structure can also be considered as the superposition of thin inorganic layers of SO42− anions and thick layers of alkylammonium cations perpendicular to the c axis. Full Article text
hy Crystal structure of bis(1-ethyl-1H-imidazole-κN3)(meso-tetramesitylporphyrinato-κ4N,N',N'',N''')iron(III) perchlorate chlorobenzene sesquisolvate By scripts.iucr.org Published On :: 2019-05-31 In the complex cation of title compound, [Fe(C56H52N4)(C5H8N2)2]ClO4·1.5C6H5Cl, the ironIII atom is coordinated in a distorted octahedral manner by four pyrrole N atoms of the porphyrin ring system in the equatorial plane, and by two N atoms of the 1-ethylimidazole ligands in the axial sites. A disordered perchlorate anion and one and a half chlorobenzene solvent molecules are also present. The cationic complex exhibits a highly ruffled porphyrin core. The average Fe—Np (Np is a porphyrin N atom) bond length is 1.988 (5), and the axial Fe—NIm (NIm is an imidazole N atom) bond lengths are 1.962 (3) and 1.976 (3) Å. The two 1-ethylimidazole ligands are inclined to each other by a dihedral angle of 68.62 (16)°. The dihedral angles between the 1-ethylimidazole planes and the planes of the closest Fe—Np vector are 28.52 (18) and 43.57 (13)°. Intermolecular C—H⋯Cl interactions are observed. Full Article text
hy Redetermination of the crystal structure of BaTeO3(H2O), including the localization of the hydrogen atoms By scripts.iucr.org Published On :: 2019-05-31 The redetermination of the crystal structure of barium oxidotellurate(IV) monohydrate allowed the localization of the hydrogen atoms that were not determined in the previous study [Nielsen, Hazell & Rasmussen (1971). Acta Chem. Scand. 25, 3037–3042], thus making an unambiguous assignment of the hydrogen-bonding scheme possible. The crystal structure shows a layered arrangement parallel to (001), consisting of edge-sharing [BaO6(H2O)] polyhedra and flanked by isolated [TeO3] trigonal pyramids on the top and bottom. O—H⋯O hydrogen bonds of medium strength link adjacent layers along [001]. Full Article text
hy Crystal structure of bis(benzoato-κO)[5,15-diphenyl-10,20-bis(pyridin-4-yl)porphyrinato-κ4N,N',N'',N''']tin(IV) By scripts.iucr.org Published On :: 2019-07-08 In the crystal structure of the title compound, [Sn(C42H26N6)(C7H5O2)2], the SnIV ion is located on a crystallographic inversion centre and is octahedrally coordinated with an N4O2 set. Four N atoms of the porphyrin ring form the equatorial plane while the axial positions are occupied by two O atoms from benzoate anions. The molecular packing of the title complex involves non-classical hydrogen bonds of the types C—H⋯O and C—H⋯N, leading to a three-dimensional network structure. Full Article text
hy Bis[benzyl 2-(heptan-4-ylidene)hydrazine-1-carboxylate]bis(thiocyanato)cobalt(II) By scripts.iucr.org Published On :: 2019-06-11 The title compound, [Co(NCS)2(C15H22N2O2)2] or C32H44CoN6O4S2, was prepared from cobalt(II) nitrate, benzyl carbazate and ammonium thiocyanate in the presence of 4-heptanone. The compound crystallizes with two centrosymmetric complexes in which the cobalt(II) atoms have a trans-CoO2N4 octahedral coordination geometry. In the crystal, N—H⋯S, C—H⋯S and C—H⋯.π contacts stack the complex molecules along the b-axis direction. Full Article text
hy 6-Methyluracil: a redetermination of polymorph (II) By scripts.iucr.org Published On :: 2019-06-21 6-Methyluracil, C5H6N2O2, exists in two crystalline phases: form (I), monoclinic, space group P21/c [Reck et al. (1988). Acta Cryst. A44, 417–421] and form (II), monoclinic, space group C2/c [Leonidov et al. (1993). Russ. J. Phys. Chem. 67, 2220–2223]. The structure of polymorph (II) has been redetermined providing a significant increase in the precision of the derived geometric parameters. In the crystal, molecules form ribbons approximately running parallel to the c-axis direction through N—H⋯O hydrogen bonds. The radical differences observed between the crystal packing of the two polymorphs may be responsible in form (II) for an increase in the contribution of the polar canonical forms C—(O−)=N—H+ relative to the neutral canonical form C(=O)—N—H induced by hydrogen-bonding interactions. Full Article text
hy Dibromido[N-(1-diethylamino-1-oxo-3-phenylpropan-2-yl)-N'-(pyridin-2-yl)imidazol-2-ylidene]palladium(II) dichloromethane monosolvate By scripts.iucr.org Published On :: 2019-07-15 In the molecule of the title N,N'-disubstituted imidazol-2-ylidene palladium(II) complex, [PdBr2(C21H24N4O)]·CH2Cl2, the palladium(II) atom adopts a slightly distorted square-planar coordination (r.m.s. deviation = 0.0145 Å), and the five-membered chelate ring is almost planar [maximum displacement = 0.015 (8) Å]. The molecular conformation is enforced by intramolecular C—H⋯Br hydrogen bonds. In the crystal, complex molecules and dichloromethane molecules are linked into a three-dimensional network by C—H⋯O and C—H⋯Br hydrogen bonds. Full Article text
hy n-Decyltrimethylammonium bromide By scripts.iucr.org Published On :: 2019-07-12 The title compound, C13H30N+·Br− (systematic name: N,N,N-trimethyl-1-decanaminium bromide), forms crystals having a bilayer structure, comprised of layers of trimethylammonium cations and bromide anions separated by the inter-digitated n-decyl groups of the cation; close ammonium-methyl-C—H⋯Br contacts connect the ions. The n-decyl chain adopts a slightly distorted all-trans conformation. The n-decyl chain exhibits positional disorder with all atoms at half occupancy. The sample was a racemic twin. Full Article text
hy N-Ethyl-N'-(3-methylbenzoyl)-S,S-diphenylsulfodiimide By scripts.iucr.org Published On :: 2019-07-15 The asymmetric unit of the title sulfodiimide, C22H22N2OS, consists of two crystallographically independent molecules with similar conformations The environment around each sulfur atom is a slightly distorted tetrahedron with two S=N bonds and two S—C bonds. The S= N(m-methylbenzoyl) and S=N(NEt) bond lengths are 1.584 (3) and 1.528 (2) Å, respectively, for one molecule, and 1.575 (2) and 1.529 (3) Å, respectively, for the other. The dihedral angles between the two phenyl rings in the molecules are 86.76 (8) and 82.49 (8)°. The N—S—N—C(m-methylbenzoyl) and N—S—N—C(ethyl) torsion angles are −60.5 (2) and −50.28 (19)°, respectively, for one molecule, and 62.9 (2) and 44.2 (3)°, respectively, for the other. In the crystal, each independent molecule is linked to its inversion-related molecule via a pair of C—H⋯O hydrogen bonds, forming a dimer. Full Article text
hy 7-(Biphenyl-4-yl)-6-hydroxyindan-1-one By scripts.iucr.org Published On :: 2019-07-16 The title compound, C21H16O2, was isolated from the reaction of 1-(2-methoxyethoxy)-1-vinylcyclopropane, 4-ethynylbiphenyl, and CO in a [5 + 1 + 2 + 1] cycloaddition reaction catalysed by [Rh(CO)2Cl]2. The crystals precipitated directly from the crude reaction mixture. A hydrogen-bonding framework between the hydroxy and carbonyl groups of a symmetry-related neighbour connects the molecules into chains running parallel to the crystallographic c axis. A minor non-merohedral twin component was included in the refinement. Full Article text
hy Ethyl 4-(4-chloro-3-fluorophenyl)-6-methyl-2-sulfanylidene-1,2,3,4-tetrahydropyrimidine-5-carboxylate By scripts.iucr.org Published On :: 2019-07-12 In the title compound, C14H14ClFN2O2S, the dihydropyrimidine ring adopts a shallow-boat conformation and subtends a dihedral angle of 81.91 (17)° with the phenyl ring. In the crystal, N—H⋯O, N—H⋯S and C—H⋯F hydrogen bonds and C—H⋯π interactions are found. Full Article text
hy N-Methyl-N-propyltryptamine (MPT) By scripts.iucr.org Published On :: 2019-07-09 The title compound {systematic name: [2-(1H-indol-3-yl)ethyl](methyl)propylamine}, C14H20N2, has a single molecule in the asymmetric unit. The molecules in the unit cell are held together in infinite one-dimensional chains along [010] through N—H⋯N hydrogen bonds between indole H atoms and trialkylamine N atoms. Full Article text
hy Bis(2-methyllactato)borate tetrahydrate By scripts.iucr.org Published On :: 2019-07-12 The asymmetric unit of the title compound (systematic name: 3,3,8,8-tetramethyl-1,4,6,9-tetraoxa-λ4-boraspiro[4.4]nonane-2,7-dione tetrahydrate), C8H12BO6·4H2O, consists of half a bis(2-methyllactato)borate molecule and two water molecules of solvation. In the crystal, O—H⋯O hydrogen bonds link the components into a three-dimensional network. Full Article text
hy (2S,3S,4R,4a'R,5R,5a'R,11a'R,12'S,12a'R)-5-(Acetoxymethyl)-2',2',10',10'-tetramethyloctahydro-3H,8'H-spiro[furan-2,7'-[1,3]dioxino[4',5':5,6]pyrano[3,2-d][1,3,6]trioxocine]-3,4,12'-triyl tria By scripts.iucr.org Published On :: 2019-07-12 While the crystal structure analysis of the title compound, C26H38O15, a synthetic derivative of sucrose, was originally reported 40 years ago [Drew et al. (1979). Carbohydr. Res. 71, 35–42], the present work has allowed for the determination of its absolute configuration through the application of resonant scattering techniques. Full Article text
hy Di-μ-acetato-bis{[3-benzyl-1-(2,4,6-trimethylphenyl)imidazol-2-ylidene]silver(I)} By scripts.iucr.org Published On :: 2019-07-30 The title compound, [Ag2(C2H3O2)2(C19H20N2)2] (2), was readily synthesized by treatment of 3-benzyl-1-(2,4,6-trimethylphenyl)imidazolium chloride with silver acetate. The solution structure of the complex was analyzed by NMR spectroscopy, while the solid-state structure was confirmed by single-crystal X-ray diffraction studies. Compound 2 crystallizes in the triclinic space group Poverline{1}, with a silver-to-carbene bond length (Ag—CNHC) of 2.084 (3) Å. The molecule resides on an inversion center, so that only half of the molecule is crystallographically unique. The planes defined by the two imidazole rings are parallel to each other, but not coplanar [interplanar distance is 0.662 (19) Å]. The dihedral angles between the imidazole ring and the benzyl and mesityl rings are 77.87 (12) and 72.86 (11)°, respectively. The crystal structure features π–π stacking interactions between the benzylic groups of inversion-related (−x + 1, −y + 1, −z + 1) molecules and C—H⋯π interactions. Full Article text
hy trans-Bis(dimethyl sulfoxide-κO)bis(3-nitrobenzohydroxamato-κ2O,O')zinc(II) By scripts.iucr.org Published On :: 2019-07-19 Single crystals of the title complex, [Zn(C7H5N2O4)2(C2H6OS)2] or [Zn(NBZH)2(DMSO)2], were isolated from a dimethyl sulfoxide (DMSO) solution containing [Zn(NBZH)2]·2H2O (NBZH = 3-nitrobenzohydroxamate anion). The asymmetric unit comprises of one O,O'-chelating NBZH anion, one O-bound DMSO ligand and one zinc(II) cation localized on an inversion centre. The three-dimensional crystal packing includes N—H⋯O and C—H⋯O hydrogen bonding, as well as O⋯H and H⋯H contacts identified by Hirshfeld isosurface analysis. Full Article text
hy (2,2-Bipyridine-κ2N,N')chlorido[η6-1-methyl-4-(propan-2-yl)benzene]ruthenium(II) tetraphenylborate By scripts.iucr.org Published On :: 2019-07-19 The title complex, [RuCl(C10H14)(C10H8N2)](C24H20B), has monoclinic (P21) symmetry at 100 K. It was prepared by the reaction of the dichlorido[1-methyl-4-(propan-2-yl)benzene]ruthenium(II) dimer with 2,2'-bipyridine, followed by the addition of ammonium tetraphenylborate. The 1-methyl-4-(propan-2-yl)benzene group, the 2,2'-bipyridine unit and a chloride ion coordinate the ruthenium(II) atom, with the 1-methyl-4-(propan-2-yl)benzene ring and bipyridine moieties trans to each other. In the crystal, the complex cations are linked by C—H⋯Cl hydrogen bonds, forming chains parallel to [010]. These chains are linked by a number of C—H⋯π interactions, involving the phenyl rings of the tetraphenylborate anion and a pyridine ring of the bpy ligand, resulting in the formation of layers parallel to (10overline{1}). Full Article text
hy (1Z,2Z)-1,2-Bis{2-[3,5-bis(trifluoromethyl)phenyl]hydrazinylidene}-1,2-bis(4-methoxyphenyl)ethane including an unknown solvate By scripts.iucr.org Published On :: 2019-07-19 The complete molecule of the title compound, C32H22F12N4O2, is generated by a crystallographic twofold axis aligned parallel to [010]. The F atoms of one of the CF3 groups are disordered over three orientations in a 0.6: 0.2: 0.2 ratio. In the crystal, molecules are linked by N—H⋯O hydrogen bonds, forming zigzag chains propagating along the a-axis direction. In addition, weak C—H⋯O and C—H⋯F bonds are observed. The contribution of the disordered solvent to the scattering was removed using the SQUEEZE routine [Spek (2015). Acta Cryst. C71, 9–18] of PLATON. The solvent contribution is not included in the reported molecular weight and density. Full Article text
hy 8,13-Diisopropyl-10,11-dimethyl-bis([1,3]dioxolo[4',5':6,7]naphtho)[1,2-d;2,1-f][1,3]dioxepine By scripts.iucr.org Published On :: 2019-07-30 The title compound, C31H30O6, was obtained by protecting the six hydroxy groups of apogossypol by acetalization with dichloromethane. The molecule has a bridging dioxepine unit which hinders the rotation around the 2,2'-internaphthyl bond. The dihedral angle between the naphthyl units is 55.73 (3)°. In the crystal, very weak C—H⋯O interactions may help to consolidate the packing. Full Article text
hy (1,4,8,11-Tetraazacyclotetradecane)palladium(II) diiodide monohydrate By scripts.iucr.org Published On :: 2019-07-23 In the title compound, [Pd(C10H24N4)]I2·H2O, the PdII ion is four-coordinated in a slightly distorted square-planar coordination environment defined by four N atoms from a 1,4,8,11-tetraazacyclotetradecane ligand. The cationic complex, two I− anions and the solvent water molecule are linked through intermolecular hydrogen bonds into a three-dimensional network structure. Full Article text
hy (Pyridine-2,6-dicarboxylato-κ3O,N,O')(2,2':6',2''- terpyridine-κ3N,N',N'')nickel(II) dimethylformamide monosolvate monohydrate By scripts.iucr.org Published On :: 2019-07-26 In the title complex, [Ni(C7H3NO4)(C15H11N3)]·C3H7NO·H2O, the NiII ion is six-coordinated within an octahedral geometry defined by three N atoms of the 2,2':6',2''-terpyridine ligand, and two O atoms and the N atom of the pyridine-2,6-dicarboxylate di-anion. In the crystal, the complex molecules are stacked in columns parallel to the a axis being connected by π–π stacking [closest inter-centroid separation between pyridyl rings = 3.669 (3) Å]. The connections between columns and solvent molecules to sustain a three-dimensional architecture are of the type water-O—H⋯O(carbonyl) and pyridyl-, methyl-C—H⋯O(carbonyl). Full Article text
hy S-Diethylamino-S-(3-methylbenzoylimino)-S,S-diphenylsulfonium tetrafluoroborate By scripts.iucr.org Published On :: 2019-07-30 The title salt, C24H27N2OS+·BF4−, was prepared by an alkylation at the amino N atom attached to the sulfur atom of the corresponding sulfodiimide. The configuration around the sulfur atom is a slightly distorted tetrahedral geometry with two S—N bonds and two S—C bonds. The lengths of the S—N(diethylamine) and S=N(m-methylbenzoylimine) bonds are 1.619 (2) and 1.551 (2) Å, respectively. The two N—S—N—C(ethyl) and the N—S—N—C(m-methylbenzoylimine) torsion angles are −85.43 (3), 58.94 (17) and 62.03 (16)°, respectively. The dihedral angle between the two phenyl rings is 84.03 (14)°. In the crystal, C—H⋯F hydrogen bonds link the cation and anion, forming a three-dimensional network. Full Article text
hy 3-(2,5-Dichlorothiophen-3-yl)-5-(2,4-dimethoxyphenyl)-1-methyl-4,5-dihydro-1H-pyrazole By scripts.iucr.org Published On :: 2019-07-26 In the title compound, C16H16Cl2N2O2S, the pyrazole ring has an envelope conformation with the C atom bearing the phenyl ring being the flap. The dihedral angles between the central pyrazole ring (all atoms) and pendant thiophene and phenyl rings are 2.00 (14) and 81.49 (12)°, respectively. In the crystal, weak C—H⋯O, Cl⋯π and π–π stacking interactions link the molecules into a three-dimensional network. Full Article text
hy 5,10-Dihydroindeno[2,1-a]indene By scripts.iucr.org Published On :: 2019-08-30 The title compound, C16H12, crystallizes with four half molecules in the asymmetric unit, each of which is located on a crystallographic centre of inversion. The molecules are essentially planar. The crystal studied was a non-merohedral twin. Full Article text
hy Bis(μ2-benzoato-κ2O,O')bis(benzoato-κO)bis(ethanol-κO)bis(μ3-hydroxido)hexakis(μ-pyrazolato-κ2N,N')hexacopper(II) ethanol disolvate By scripts.iucr.org Published On :: 2019-09-03 Trinuclear copper–pyrazolate entities are present in various Cu-based enzymes and nanojar supramolecular arrangements. The reaction of copper(II) chloride with pyrazole (pzH) and sodium benzoate (benzNa) assisted by microwave radiation afforded a neutral centrosymmetric hexanuclear copper(II) complex, [Cu6(C7H5O2)4(OH)2(C3H3N2)6(C2H5OH)2]·2C2H5OH. Half a molecule is present in the asymmetric unit that comprises a [Cu3(μ3-OH)(pz)3]2+ core with the copper(II) atoms arranged in an irregular triangle. The three copper(II) atoms are bridged by an O atom of the central hydroxyl group and by three bridging pyrazolate ligands on each of the sides. The carboxylate groups show a chelating mode to one and a bridging syn,syn mode to the other two CuII atoms. The coordination environment of one CuII atom is square-planar while it is distorted square-pyramidal for the other two. Two ethanol molecules are present in the asymmetric unit, one binding to one of the CuII atoms, one as a solvent molecule. In the crystal, stabilization arises from intermolecular O—H⋯O hydrogen-bonding interactions. Full Article text
hy 1:1 Co-crystal of 3-ethyl-4-methyl-3-pyrrolin-2-one and 3-ethyl-4-methyl-3-pyrroline-2,5-dione By scripts.iucr.org Published On :: 2019-09-10 Crystallization from a 20-year-old commercial source of 3-ethyl-4-methyl-3-pyrrolin-2-one afforded 1:1 co-crystals of this compound (C7H11NO) with its oxidized derivative, 3-ethyl-4-methyl-3-pyrroline-2,5-dione (C7H9NO2). The compound crystallizes in the space group Poverline{1}, with two molecules of each species in the asymmetric unit. These four molecules form a hydrogen-bonded tetramer with a dimer of 3-ethyl-4-methyl-3-pyrrolin-2-one as the core flanked by one molecule of the dione on each side. Full Article text
hy 7-{3-Ethoxy-4-[2-(2-methoxyethoxy)ethoxy]phenyl}-5,6,8,9-tetrahydrodibenzo[c,h]acridine By scripts.iucr.org Published On :: 2019-09-06 In the title compound, C34H35NO4, the dihedral angle between the pyridine ring and attached benzene ring is 79.17 (8)°. The methoxyethoxy–ethoxy side chain is disordered over two orientations in a 0.732 (7):0.268 (7) ratio. In the crystal, very weak C—H⋯N and C—H⋯O interactions link the molecules. Full Article text
hy N,N,N-Trimethyl-1-[4-(pyridin-2-yl)phenyl]methanaminium hexafluoridophosphate By scripts.iucr.org Published On :: 2019-09-06 In the cation of the title molecular salt, C15H19N2+·PF6−, the dihedral angle between the benzene and pyridine rings is 38.21 (10)°. In the crystal, weak C—H⋯F interactions arising from methyl and methylene groups adjacent to the quaternary N atom generate (001) sheets. Full Article text