A photoluminescent dinuclear silver(I) complex exhibits Csingle bondH···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), [Ag2(μ-2,3-pydc)2(Hpda)2]⋅2H2O (H22,3-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 μ-O atoms, forming a 4-membered parallelogram Ag2O2 ring. The most striking feature is that the structure contains both intra- and inter-molecular Csingle bondH···Ag hydrogen bonding interactions to form infinite 1D chains containing R22(8) rings.