A photoluminescent dinuclear silver(I) complex exhibits C-H center dot center dot center dot Ag close interactions and a new coordination mode of the pyridine-2,3-dicarboxylate

In this study, a novel dinuclear Ag(I)-pyridine-2,3-dicarboxylate complex with 1,3-diaminopropane ligand (pda). [Ag-2(mu-2,3-pydc)(2)(Hpda)(2)]center dot 2H(2)O (H(2)2,3-pydc = pyridine-2,3-dicarboxylic acid), has been synthesized. The molecular structure of complex has been determined by the single crystal X-ray diffraction. The complex has been observed to crystallize in the triclinic space group P-1. The Ag(I) ion exhibits a distorted trigonal pyramidal geometry by two 2,3-pydc and one protonated monodentate Hpda ligands. The 2,3-pydc ligand acts as a tridentate bridging ligand with a new coordination mode between two Ag(I) centers through the pyridine N and carboxyl mu-O atoms, forming a 4-membered parallelogram Ag2O2 ring. The most striking feature is that the structure contains both intra- and inter-molecular C-H center dot center dot center dot Ag hydrogen bonding interactions to form infinite 1D chains containing R-2(2)(8) rings. (C) 2011 Published by Elsevier B.V.