catena-Poly[[[N′-(4-cyanobenzylidene)nicotinohydrazide)silver(I)]-μ-N′-(4-cyanobenzylidene)nicotinohydrazide] hexafluoridophosphate]

Abstract

In the title polymer, {[Ag(C14H10N4O)2]PF6}n, each AgI ion is coordinated by two N atoms from two pyridyl rings of independent N′-(4-cyanobenzylidene)nicotinohydrazide ligands, and one N atom from one carbonitrile group of a symmetry-related ligand in a distorted T-shaped geometry. The ligands exhibit two modes of coordination. One acts as a bridge connecting Ag atoms to form one-dimensional chains along [overline{1}01]. The other acts as a terminal monodentate ligand, coordinating to Ag through its pyridyl N atom. Two neighbouring antiparallel chains in the crystal are connected through N—H...O hydrogen bonds. Other adjacent chains are packed via Ag...O interactions, with Ag...O separations of 2.876 (2) Å. In addition, PF6− counter-anions interact with the hydrazone groups through N—H...F hydrogen bonds. The PF6− anion is disordered over two sites, with occupancies of 0.773 (8) and 0.227 (8).