A Disparate 3-D Silver(I) Coordination Polymer of Pyridine-3,5 and Pyrimidine with Strong Intermetallic Interactions: X-Ray Crystallography, Photoluminescence and Antimicrobial Activity

Abstract

A polymeric silver(I) complex, [Ag<inf>4</inf>(-pydc)<inf>2</inf>(-pm)<inf>2</inf>]<inf>n</inf> (1) (pydc = pyridine-3,5-dicarboxylate and pm = pyrimidine), has been synthesized and characterized by elemental analysis, IR spectroscopy, thermal analysis, and single-crystal X-ray diffraction. X-ray crystallographic data of 1 revealed that pydc exhibits two different coordinaton modes that play a key role in the construction of the 3-D crystal network including Ag-carboxylate clusters in which close Ag-Ag distances exist. The magnitudes of close Ag-Ag interactions in second-order energy (E2) have been revealed by natural bond orbital analysis performed with single point energy calculation using the experimental geometry of 1. Furthermore, the luminescent properties of 1 show strong fluorescence with two emission maxima in the visible region. Also, 1 has antifungal activity on Candida albicans (MIC value, 4 g mL-1) and good antibacterial activity on micro-organisms (MIC value, 64-256 g mL-1). © 2014 Taylor & Francis.