Crystal structure of octa-kis-(4-meth-oxy-pyridinium) bis-(4-meth-oxy-pyridine-κ N )tetra-kis-(thio-cyanato-κ N )ferrate(III) bis-[(4-meth-oxypyri-dine-κ N )pentakis-(thio-cyanato-κ N )ferrate(III)] hexa-kis-(thio-cyanato-κ N )ferrate(III) with iron in three different octa-hedral coordination environments.

The crystal structure of the title salt, (C6 H8 NO)8 [Fe(NCS)4 (C6 H7 NO)2 ][Fe(NCS)5 (C6 H7 NO)]2 [Fe(NCS)6 ], comprises three negatively charged octa-hedral FeIII complexes with different coordination environments in which the FeIII atoms are coordinated by a different number of thio-cyanate anions and 4-meth-oxy-pyridine ligands. Charge balance is achieved by 4-meth-oxy-pyridinium cations. The asymmetric unit consists of three FeIII cations, one of which is located on a centre of inversion, one on a twofold rotation axis and one in a general position, and ten thio-cyanate anions, two 4-meth-oxy-pyridine ligands and 4-meth-oxy-pyridinium cations (one of which is disordered over two sets of sites). Beside to Coulombic inter-actions between organic cations and the ferrate(III) anions, weak N-H⋯S hydrogen-bonding inter-actions involving the pyridinium N-H groups of the cations and the thio-cyanate S atoms of the complex anions are mainly responsible for the cohesion of the crystal structure.