X-ray analysis has shown that the complexes of silver(I) with the anionic forms of 2-pyrazinecarboxylic and 2,3-pyrazinedicarboxylic acids are three-dimensional network polymers. Ag(C5H3O2N2) (1) crystallizes in space groupPna21witha=7.028(2),b=11.510(3),c=6.949(2) Å andZ=4. Silver tetrahedral coordination occurs through three ligands: the first one acts as a bidentate chelator (Ag−O=2.539(4), Ag−N=2.334(4)Å), the second one involves one N pyrazine atom (Ag−N=2.196(4)Å) and the third one bonds through one O-carboxylato atom (Ag−O=2.323(4)Å). The dinuclear complex Ag2(C6H2O4N2)(NH3) (2) crystallizes in space groupP21/cwitha=7.775(2),b=16.455(2),c=7.174(1) Å, β-115.21(1)° andZ=4. Each of the two silver atoms shows a trigonal environment. The first silver atom involves two O carboxylic atoms (Ag−O=2.312(4), 2.374(4)Å) and one N pyrazine atom (Ag−N=2.277(3)Å) belonging to three different ligands. The second one involves one O carboxylic atom (Ag−O=2.364(3)Å) and one N pyrazine atom (Ag−N=2.304(4)Å) from the same chelating ligand and one N am
展开▼
