Intensity of the carbonyl stretching modes in certain halogenocarbonyl derivatives of chromium, tungsten, manganese, rhenium and iron

Abstract

The infra-red absorption intensities of the metal-carbonyl stretching modes have been determined for the following species Mn(CO)₅I, Mn(CO)₅Br, Mn(CO)₅Cl, Re(CO)₅I, Re(CO)₅Br, [Cr(CO)₅I]^–, [Cr(CO)₅Br]^–, [Cr(CO)₅Cl]^–, [W(CO)₅I]^–, [W(CO)₅Br]^–, [W(CO)₅Cl]^–, Fe(CO)₄I₂, [Mn(CO)₄I₂]^–, [Mn(CO)₄Br₂]^–, [Mn(CO)₄IBr]^–, [Mn(CO)₄BrCl]^–, Mn₂(CO)₈I₂, Mn₂(CO)₈Br₂, Mn₂(CO)₈Cl₂, Cr(CO)₆, Mo(CO)₆ and W(CO)₆. The spectra are discussed and some force constants have been calculated. The spectrum of di-iodotetracarbonyliron has been assigned.