Some factors influencing the absolute intensity of the carbonyl stretching modes of a series of transition-metal pentacarbonylhalide derivatives

Abstract

Available data on the absolute i.r. intensities of carbonyl stretching vibrations of the series of transition-metal pentacarbonylhalides of general formula XM(CO)₅(X = Cl, Br, l; M = Mn, Re) and XM(CO)₅^–(X = Cl, Br, l; M = Cr, W) has been analysed. The present treatment recognises that a local carbonyl bond moment derivative need not necessarily be colinear with the carbonyl bond.