Cationic metal nitrosyl complexes. Part 5. Synthesis of dinitrosylmolybdenum compounds
Abstract
The reaction of [Mo(NO)2L2Cl2][L = MeCN, PhCN, CH2CHCN, pyridine (py), or PPh3; L2= 2,2′-bipyridine (bipy) or 1,2-bis(diphenylphosphino)ethane (dppe)] in 1,2-dimethoxyethane (dme) affords monocationic [Mo(NO)2L2Cl(dme)]+ and dicationic [Mo(NO)2L2(dme)2]2+ species. The mechanism of chloride abstraction has been investigated by i.r., n.m.r., and u.v.–visible spectroscopy, conductimetry, and potentiometry. The dme solvates, when treated with nitries or bipy, yield a series of cationic dinitrosylmolybdenum complexes. Some of the dicationic complexes catalyse the polymerisation of norbornadiene. The characterization of all new complexes is described.