Iron(III) complexes of triphenylphosphine and triphenylarsine oxides; their electron paramagnetic resonance and vibrational spectra

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Abstract
E.p.r. spectra are reported for the complexes FeL4(ClO4)3 and FeL2X3(L = Ph3PO, X = Cl, Br, NO3,NCS; L = Ph3AsO, X = Cl, Br, NO3). The spin-Hamiltonian parameters D and λ deduced from these measurements are related to the structures of the complexes; the vibrational spectra are also discussed. Results imply that the perchlorate complexes contain planar FeL4 3+ ions, whilst the chloride and bromide complexes possess the structure trans-[FeL4X2]+(FeX4)–. The nitrate and thiocyanate complexes appear to be monomeric, pentaco-ordinate systems.