(1–3-η-Allyl)dicarbonyl-molybdenum(II) and -tungsten(II) complexes and their reactions with some chelating anions

Abstract

Complexes [MX(η-C3H5)(CO)2L2][M = Mo or W; L2= 2.2′-bipyridyl (bipy) or di(2-pyridyl)amine (dpa); X = Cl, Br, I,NCS, MeCO2, CF3CO2, PhSO2, or p-MeC6H4SO2] have been prepared by one or more of four preparative routes. The oxo-anions are all unidentate and O bonded. Reaction of the molybdenum complexes with sodium pentane-2,4-dionate and dimethyl- or diethyl-dithiocarbamate in the presence of pyridine results in displacement of halide and bipy or dpa and formation of [Mo(η-C3H5)(CO)2(A)(py)](A = pd, Me2NCS2–, or Et2NCS2–). The salicylaldehyde anion (sal) reacts similarly with molybdenum dpa complexes but behaves as a unidentate ligand towards the corresponding bipy complexes with formation of [Mo(η-C3H5)(CO)2(sal)(bipy)].