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

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.