Effect of anions on cadmium(II) complexes with ligand 2-(pyrazin-2-yl)-1H-benzimidazole

► The anions play an important role in controlling the molecular architecture. ► Three complexes constructed by 2-(pyrazin-2-yl)-1H-benzimidazole and cadmium halide. ► The halide anions affect the structures and luminescent intensity of the products. ► The structures of products are not affected by the ratios of ligand and metal.