The chemistry of π-cyclopentadienyl nitrosyl molybdenum complexes. Tertiary-phosphine and -arsine, and isonitrile complexes

Abstract

The syntheses of the neutral complexes, [(π-C₅H₅)Mo(NO)I₂L](L = PMe₂Ph, AsMe₂Ph, AsPh₃ or p-MeOC₆H₄NC), and of monocationic species [(π-C₅H₅)Mo(NO)I₂L]⁺I^–(L = PMe₂Ph), by the reaction of the appropriate Lewis base with [{(π-C₅H₅)Mo(NO)I₂}₂], is described. From conductance measurements in acetone and dimethyl sulphoxide (Me₂SO) it is considered that (π-C₅H₅)Mo(NO)IL(S)]⁺(S = Me₂CO or Me₂SO) and [(π-C₅H₅)Mo(NO)L(Me₂SO)₂]²⁺ are formed in these solvents. The ¹H n.m.r. spectra of all the complexes, in a variety of solvents have been interpreted in terms of the solvated species mentioned above, and the form of the methyl proton resonances obtained from the spectra of the species containing PMe₂Ph and AsMe₂Ph show that these solvated species exist as isomers.