Chemistry of polynuclear compounds. Part IX. Infrared spectra of some mercury-metal carbonyl complexes

Abstract

The far infrared spectra of a series of complexes containing a mercury-transition metal bond have been determined. The mercury-metal stretching frequencies have been assigned. It is apparent that, in many of the complexes, a considerable mixing of the various vibrations within the molecule occurs. For complexes containing the binuclear-mercury-metal grouping, the intensity of the metal-mercury vibrations mainly arises from coupling with the mercury-halogen vibration. The infrared spectra in the metal-carbonyl stretching region are discussed in terms of the Cotton-Kraihanzel model. The force constants indicate that π-bonding may occur between the metals in the complexes XHg-Mn(CO) 5 (X = Cl, Br, or I) and R3Sn-Mn(CO)5 (where R = Ph or Cl). Show more