FeIII in the high-spin state in dimethylammonium bis[3-ethoxysalicylaldehyde thiosemicarbazonato(2-)-κ3O2,N1,S]ferrate(III)

Abstract

The synthesis and crystal structure (100 K) of the title compound, [(CH₃)₂NH₂][Fe(C₁₀H₁₁O₂N₃S)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^IIIS₂N₂O₂ 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.

Keywords: FeIII complex; crystal structure; high-spin; magnetic susceptibility; salicylaldehyde; thiosemicarbazone.