A SIMPLE METHOD FOR CALCULATING THE FORCE-FIELDS OF M(CO)(5)L AND SQUARE PYRAMIDAL M(CO)(5) COMPLEXES

A relationship between the interaction constant of cis-COeq-COax and t he observed (CO)-C-12-O-16 stretching frequencies has been derived to solve the secular equations for M(CO5)L and M(CO)(5) complexes which b elong to C-4v symmetry. The solution obtained has led to the relations by which carbonyl stretching force constants and interaction constant s can be calculated directly from (CO)-C-12-O-16 stretching frequencie s. The calculated force constants for complexes containing a wide vari ety of M and L have been found to be in excellent agreement with those obtained from isotopic enrichment studies.