Substituted metal carbonyls: VI. Convenient syntheses and characterizations of group 6 metal tricarbonyls with ligating α-diimine and triethyl phosphite

Abstract

Syntheses of group 6 mixed-ligand tricarbonyls M(CO 3(NN)[P(OC 2H 5) 3] (M = Cr, Mo, W; NN = 2,2′-bipyridyl and 1,10-phenanthroline) have been reinvestigated, simplified and the complexes spectroscopically characterized. The Cr and Mo complexes can be prepared conveniently from the tetracarbonyls M(CO) 4(NN) at ambient temperature via a trimethylamine N-oxide-initiated decarbonylation pathway. All the tricarbonyls can also be satisfactorily prepared by refluxing a mixture of M(CO) 6, (CH 3) 3NO, P(OC 2H 5) 3 and the α-diimine ligand in a one-pot reaction. FT-IR, 1H and 31P NMR spectroscopic data are presented and discussed.