Carbonyl halides of the Group VI transition metals. VIII. Paramagnetic and diamagnetic dicarbonyl derivatives of molybdenum(II)

Abstract

Complexes of the general formula Mo(CO)₂L₂X₂ (L = pyridine (py), 2,2'- dipyridyl (dipy), 1,l0-phenanthroline (phen); X = Cl, Br) have been isolated. The pyrldine derivatives are yellow monomeric compounds which are paramagnetic, but the complexes with dipy and phen contain diamagnetic seven-coordinate cations and are correctly formulated as [Mo(CO)₂L₂X]⁺X^-. Conductance, infrared, magnetic, and electron spin resonance studies have been carried out.