Silver(I) coordination polymer and nine-coordinated cadmium(II) complex with dimethyl pyridine-2,6-dicarboxylate supported by solid state and electrochemical studies

Two complexes of dimethyl pyridine-2,6-dicarboxylate (L), [CdL3][CdI4] (1) and [Ag(L)NO3](n) (2) were prepared and identified by elemental analysis, FT-IR, Raman and H-1 NMR spectroscopy, cyclic voltammetry, and single-crystal X-ray diffraction. The crystal structure of 1 contains both complex cation and complex anion of the metal. Cadmium in [CdL3](2+), coordinated by three nitrogens and six oxygens, has a distorted tricapped trigonal prismatic geometry while [CdI4](2-), with four coordinated iodides, has a slightly distorted tetrahedral geometry. In the crystal structure of 2, silver has distorted tetrahedral geometry by coordination of nitrogen and three oxygens. One oxygen of nitrate in 2 bridges two silvers. Extension of these bridges forms a 1-D coordination polymer. Cyclic voltammetry of L reveals two reduction steps which are shifted after coordination in 1, while no significant shifts are observed in 2. Hydrogen bonds including C-HI, C-HO and C-HC and short interactions such as CI, , and O are compared with Cambridge Structural Database analogs . Two brief structural surveys on ligand coordination modes and silver polymers are also presented.