Fe III in the high-spin state in dimethylammonium bis[3-ethoxysalicylaldehyde thiosemicarbazonato(2-)-κ 3 O 2 ,N 1 ,S]ferrate(III).

The synthesis and crystal structure (100 K) of the title compound, [(CH 3 ) 2 NH 2 ][Fe(C 10 H 11 O 2 N 3 S) 2 ], are reported. The asymmetric unit consists of an octahedral [Fe III (L) 2 ] - fragment, where L 2- is 3-ethoxysalicylaldehyde thiosemicarbazonate(2-), and a dimethylammonium cation. Each L 2- ligand binds with the thiolate S, the imine N and the phenolate O atoms as donors, resulting in an Fe III S 2 N 2 O 2 chromophore. The ligands are orientated in two perpendicular planes, with the O and S atoms in cis positions, and mutually trans N atoms. The Fe III ion is in the high-spin state at 100 K. The variable-temperature magnetic susceptibility measurements (5-320 K) are consistent with the presence of a high-spin Fe III ion with D = 0.83 (1) cm -1 and g = 2.