The villagers fear losing their lands and livelihood and also adverse affects of uranium mining on their lives

Toronto : Viking Canada ; New York, NY : Penguin Group (USA), 2006

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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.

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.

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.

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}).

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.

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.