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

The title compound, [Zn(C₁₉H₁₂N₅)₂], crystallizes in the tetra­gonal space group P4₃2₁2, 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 reported P4₂2₁2 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.