Synthesis and crystal structure of a novel one-dimensional coordination chain:: [Ag(▭3-Hbpyca)(H2O)]n (bpyca=2,2′-bipyridine-3,3′-dicarboxylate)

A novel one-dimensional silver(I) complex with monoprotonated 2,2'-bipyridine-3,3'-dicarboxylate (Hbpyca), namely [Ag(square (3)-Hbpyca)(H2O)](n), has been prepared and characterized by X-ray crystallography. The title complex crystallizes in the monoclinic space group P2(1)/c with a 12.699(7), b 11.877(7), c 8.427(4) Angstrom, beta 107.53(1)degrees, V 1212.0(11) Angstrom (3), Z 4. The crystal structure comprises one-dimensional [Ag(square (3)-Hbpyca)(H2O)](n) chains in which the metal atom is coordinated in a distorted tetrahedral AgN2O2 environment by one aqua ligand, two pyridyl groups from two different Hbpyca ligands and one oxygen atom from the carboxy group of the third Hbpyca ligand. Each Hbpyca ligand acting in an unusual square (3) mode (N,N',O) bridges three Ag-I atoms to form a one-dimensional polymeric chain. Adjacent chains are further interlinked into a three-dimensional supramolecular array by the interchain hydrogen bonding and pi pi interactions among the aqua ligands, pyridyl groups and carboxylato groups.