Some novel phosphoranides containing pentafluorophenyl groups

Abstract

Several novel phosphoranides containing pentafluorophenyl groups, of formulae [P(C₆F₅)X₂Y]^–(X = Cl, Y = Cl, Br, or I; X = Br, Y = Br or I; X = NCS, Y = Cl, Br, I, or NCS) or [P(C₆F₅)₂X(Y)]^–(X = Cl, Y = Cl, Br, or I; X = Br, Y = Br or I; X = CN, Y = Cl, Br, I, or NCS) have been identified in solution by means of ³¹P n.m.r. spectroscopy. Most of the species have been isolated as salts with tetra-alkylammonium ions, and further characterised by elemental analysis and (in some cases) i.r. spectroscopy. These ions {apart from [P(C₆F₅)₂(CN)Y]^–} represent the first simple phosphoranides with an organo-group attached to phosphorus and no cyano-groups present. The species with two pentafluorophenyl groups are the first phosphoranides with two organo-groups directly bound to phosphorus. No acceptor properties towards halide ions were shown by P(CCl₃)Cl₂ or P(C₆F₅)₂(NCS).