Paramagnetic oxotungsten(V) complexes containing the hydrotris(3,5- dimethylpyrazol-1-yl)borate ligand

Abstract

Sky-blue Tp*WOCl2 has been synthesized from the high-yielding reaction of Tp*WO2Cl with boron trichloride in refluxing toluene. Dark-red Tp*WOI2 was prepared via thermal decarbonylation followed by aerial oxidation of Tp*WI(CO)3 in acetonitrile. From these precursors, an extensive series of mononuclear tungstenyl complexes, Tp*WOXY [X = Cl-, Y = OPh-, SPh-; X = Y = OPh-, 2-(n-propyl)phenolate (PP -), SPh-, SePh-; XY = toluene-3,4-dithiolate (tdt2-), quinoxaline-2,3-dithiolate (qdt2-), benzene-1,2-diselenolate (bds2-); Tp* = hydrotris(3,5- dimethylpyrazol-1-yl)borate], was prepared by metathesis with the respective alkali-metal salt of X-/XY2- or (NHEt3) 2(qdt). The complexes were characteriz..