The co-ordination chemistry of manganese. Part V. The preparation and spectroscopic characterisation of some manganese(II) complexes of arsenic and antimony donor ligands

Abstract

Tetrahydrofuran has been found to be a convenient solvent for the preparation of complexes of manganese(II) the ‘hardest’ 3d metal ion, with o-phenylenebis(dimethylarsine)(pdma) and o-phenylene(dimethylarsine)(dimethylastibine)(pdads), bidentate ligands containing ‘soft’ arsenic and antimony donors. The i.r., electronic reflectance, and e.p.r. spectra indicate a trans-octahedra geometry for these [Mn(L–L)₂X₂](X = Cl, Br, or I) species. E.p.r. evidence also suggests that trace amounts of moisture readily decompose these complexes with the formation of [MnX₄]^2– ions.