RESUMO
The title compound, [Ag(C(6)H(4)N(3)O(3))](n) or [Ag(pyzca)](n) (where pyzca is 3-aminocarbonylpyrazine-2-carboxylate), (I), was obtained by silver-catalysed partial hydrolysis of pyrazine-2,3-dicarbonitrile in aqueous solution. The compound has a distorted trigonal-planar coordination geometry around the Ag(I) ion, with each ligand bridging three Ag(I) ions to form a one-dimensional strand of molecules parallel to the b axis. An extensive hydrogen-bond pattern connects these strands to form a three-dimensional network of mog topology.
RESUMO
The title compound, [Ag(C(7)H(10)N(2))(2)]NO(3).2H(2)O or [Ag(dmap)(2)]NO(3).2H(2)O, where dmap is 4-(dimethylamino)pyridine, has a distorted linear coordination geometry around the Ag(I) ion. A novel pattern of water-nitrate hydrogen-bonded anionic strands is formed in the c direction, with the cationic [Ag(dmap)(2)](+) monomers trapped between them. The Ag(I) ion and the nitrate group atoms, as well as the water molecules (including the H atoms), are on a crystallographic mirror plane (Wyckoff position 4a). The influence of bulky methyl substituents in position 4 of the 4-(dimethylamino)pyridine ligand on packing is discussed. The absolute structure was determined unequivocally.
RESUMO
The title compound, [Ag(C(3)H(6)N(6))(2)]NO(3), has an alternating two-dimensional bilayer structure supported by extensive hydrogen bonds. The [Ag(melamine)(2)](+) cationic monomers (melamine is 1,3,5-triazine-2,4,6-triamine) are connected via N-H...N hydrogen bonds to form two-dimensional sheets. Nitrate groups are sandwiched between two sheets through N-H...O hydrogen bonds. An almost perfectly linear coordination geometry is found for the Ag(I) ions. The triazine ligands are slightly distorted due to pi-pi interactions.
