Hydrogen bonded 3D-network of silver and 2,6-pyridinedicarboxylic acid complex: Structure and applications

Abstract

The addition of an aqueous solution of silver nitrate to an aqueous acetonitrile solution of 2,6-pyridinedicarboxylic acid (2,6-pydcH2) affords a new complex, {[Ag(2,6-pydcH)(2,6-pydcH2)]·2H2O}, 1, at ambient conditions. The complex 1 was structurally characterized by means of elemental analysis, FT-IR, UV–Visible, NMR techniques and thermal gravimetric analysis. The structure of 1 was determined by single crystal X-ray diffraction. The asymmetric unit of complex 1 consists of one Ag(I) center bonded to one 2,6-pydcH2 and one deprotonated 2,6-pydcH with two water molecules acting as guest molecules connecting the discrete molecules of the complex 1. The Ag(I) atom adopts a distorted tetrahedral geometry. The discrete units of complex 1 extend along the b-axis creating 1D-chain via hydrogen bonds. The hydrogen bonds and π-π stacking interactions extend the structure of 1 to 3D-network structure accommodating the guest water molecules. The cytotoxic impact of 1 on the viability of MCF-7 cells was examined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay exhibiting great restraint action to MCF-7 cells. Furthermore, the catalytic degradation performance of 1 towards methylene blue dye (MB) in presence of H2O2 as oxidant had been also discussed. The luminescence spectra in the solid state of the 2,6-pydcaH2 and the complex 1 were discussed.