Notes. The co-ordination of small molecules by manganese(II) phosphine complexes. The reaction of some [MnX2L](X = Cl, Br, or I; L = PPrn3, PMe2Ph, or PPh3) complexes with tetracyanoethylene

Abstract

When [MnX₂L](X = Cl, Br, or I; L = PPrⁿ₃, PMe₂Ph, or PPh₃) complexes react with tetracyanoethylene (tcne) in toluene slurries the 1 : 1 adducts [MnX₂L(tcne)] are formed. The magnetic moments of the adducts at room temperature, µ_eff.= 4.6–4.9, are consistent with a d⁴ manganese(III) species, and i.r., visible, and e.s.r. spectroscopic data are also consistent with the transfer of an electron from manganese(II) to tcne on adduct formation resulting in a manganese(III)–tcne˙^– species. The tcne co-ordinates via a nitrile nitrogen.