Do ν(CO) Stretching Frequencies in Metal Carbonyl Complexes Unequivocally Correlate with the Intrinsic Electron-Donicity of Ancillary Ligands?
Résumé
Distorting the ν(CO) response: Weak Cipso⋅⋅⋅C≡O and Hortho⋅⋅⋅C≡O interligand interactions within MnI aryloxycarbene complexes are seen to induce a significant redshift of the corresponding IR ν(CO) stretching frequencies, revealing that the position of such bands may not unequivocally correlate with the intrinsic electron-donicity of ancillary ligands.