Co-crystals: The neutral molecules in modification of crystal structure of [W(CN)6(bpy)]2− anion salts

Abstract

Ten new coformers were incorporated into structure of (PPh4)2[W(CN)6(bpy)] salt (bpy = 2,2′-bipyridine), this includes such neutral molecules as: 1,10-phenanthroline, 4-hydroxyacetophenone, 2-amino-5-nitrobenzonitrile, 5-amino-2-pyridinecarbonitrile, 2-nitrobenzonitrile, 4-formylbenzoic acid, 4-pyridinecarbonitrile, 2-pyridinecarbonitrile, 2-hydroxybenzonitrile and 2-naphtol. The composition of cocrystals were confirmed by elemental analysis while the incorporation of coformers was also proved by IR spectra. The single crystal structures were solved and described for salts with 2-naphtol and 4-hydroxyacetophenone. The formation of crystals was caused by formation of strong hydrogen bonds between coformers and cyanido ligands of the anion. The structures were compared and discussed with other similar systems. Additionally, the influence of the coformer on the packing structure of hexacyanido tungsten(IV) complexes was discussed.