mer-Tris­(ethyl­diphenyl­phosphine oxide)tris(isothio­cyanato)iron(III)

The title compound, [Fe(NCS)₃(C₁₄H₁₅OP)₃], adopts a meridional coordination of the three NCS⁻ ligands and three OPEtPh₂ ligands. The Fe—N and Fe—O bond lengths fall in the range 1.982 (2)–2.045 (2) Å, and the bond angles around the Fe³⁺ centre deviate only slightly from an ideal octa­hedral geometry. The three OPEtPh₂ ligands have similar geometries to each other and adopt the same general conformation with differences in the relative orientations of the phenyl groups. The NCS⁻ ligands are almost linear and the Fe—N—C angles range from 170.78 (17) to 177.56 (17)°. In contrast, the Fe—O—P angles show a great variation with two angles close to 180° [166.29 (10) and 171.21 (10)°] and the angles corresponding to a disordered OPEtPh₂ ligand far from 180° [137.0 (10) and 137.9 (5)°]. Both the disorder and the variations in the angles around the N and O atoms seem to result from weak inter­molecular C—H...S inter­actions.