FeCl3 behavior in acetonitrile: structures of [FeCl2(CH3CN)4][FeCl4] and [AlCl(CH3CN)5][FeCl4]2.CH3CN

The structures of the complexes [FeCl 2 (CH 3 CN) 4 ][FeCl 4 ], tetrakis(acetonitrile)dichloroiron(III) tetrachloroferrate(1-), and [AlCl(CH 3 CN) 5 ][FeCl 4 ] 2 .CH 3 CN, pentakis(acetonitrile)chloroaluminium(III) bis[tetrachloroferrate(1-)] acetonitrile solvate, have been determined from single-crystal X-ray diffraction data. [FeCl 2 (CH 3 CN) 4 ][FeCl 4 ] is built up from [FeCl 2 (Ch 3 CN) 4 ] + octahedra and [FeCl 4 ] - tetrahedra whereas [AlCl(CH 3 CN) 5 ][FeCl 4 ] 2 .CH 3 CN is composed of [AlCl(CH 3 CN) 5 ] 2+ octahedra, [FeCl 4 ] - tetrahedra and uncoordinated CH 3 CN molecules