Pyridinium diaquabis(methylenediphosphonato-κ2O,O′)chromate(III) tetrahydrate

In the title complex, (C5H6N)[Cr(CH4O6P2)2(H2O)2]·4H2O, the CrIII atom, lying on an inversion centre, is coordinated by two bidentate methylene diphosphonate ligands and two water molecules in a distorted octahedral coordination geometry. The pyridinium cation is located on an inversion centre, with an N atom and a C atom sharing a position each at a half occupancy. A three-dimensional network is constructed by O—H...O, N—H...O and C—H...O hydrogen bonds between the pyridinium cation, complex anion and uncoordinated water molecules.

Abstract licence: CC BY

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