Chemistry of iron complexes—III. X-ray diffraction,ESR and other spectral studies of new iron(II) and iron(III) complexes with tri-p-tolylarsine oxide

Reactions of iron(II) and iron(III) salts with tri-p-tolylarsine oxide(L) in suitable organic solvents yield complexes of formulas: (i) FeL₂Cl₂(OH₂)₂] FeCl₄].2H₂O, FeL₂Br₂] FeBr₄].2H₂O; (ii) Fe(NCS)₃L₂].H₂O; (iii) FeL(O₂ClO₂)₂(OH₂)] (ClO₄).0.25C₆H₆; (iv) FeL₃I] FeI₃].H₂O and (v) Fe(CO)₃LI]I. Characterization has been done through elemental analyses, IR, far IR, ESR, and reflectance spectra, molar conductance, magnetic moments, t.g.a. and X-ray diffraction (powder) data. The species FeL₂Cl₂(OH₂)₂]⁺, FeL₂Br₂]⁺, Fe(NCS)₃L₂], FeL(O₂ClO₂)₂OH₂]⁺, FeL₃I]⁺ and Fe(CO)₃LI]⁺ have been assigned trans-octahedral, trans-square planar, trans-trigonal bipyramid, trans-octahedral, tetrahedral and cis-trigonal bipyramid structures respectively.