Polarizability effect in transition metal carbonyl complexes

The literature date on substituent influence on the carbonyl stretching frequencies (ν), CO stretching force constants (k), as well as 13C NMR carbonyl chemical shifts (δ) have been analyzed for 19 series of the transition metal carbonyl complexes. It was established for the first time that the ν, k and δ values depend not only on the inductive and resonance effects but also on the polarizability of substituents. The polarizability contribution ranges up to 37%.

Graphical abstractThe properties of the transition metal carbonyl complexes (frequencies ν, force constants k, NMR chemical shifts δ) depend on joint influence of the inductive, resonance, and polarizability effects of X substituents.Figure optionsDownload full-size imageDownload as PowerPoint slide