Chemistry Letters, Vol.29, No.7, 814-815, 2000
Formation and spectroscopic characterization of the carbon monoxide adduct of an alkanethiolate-coordinated heme
The CO adduct of a thiolate-coordinated heme was obtained by two different methods and characterized by UV-vis and resonance Raman spectroscopy. The nu(Fe-CO) band was observed at 428 cm(-1). The unusually low frequency indicates the extremely strong sigma-donation from the thiolate axial ligand to the heme iron.