A new polymorph of bis[2,6-bis(1H-benzimidazol-2-yl-κN3)pyridinido-κN]zinc(II)

Abstract

The title compound, [Zn(C19H12N5)2], crystallizes in the tetragonal space groupP43212, with the monomer residing on a twofold axis. The imidazole N-bound H atoms are disordered over the two positions, with refined occupancies of 0.59 (3) and 0.41 (3). The strong similarities to, and slight differences from, a reportedP42212 polymorph which has a 50% smaller unit-cell volume [Harvey, Baggio, Muñoz & Baggio (2003).Acta Cryst.C59, m283–m285], to which the present structure bears a group–subgroup relationship, are discussed.