M. Matsu-ura et al., Formation and spectroscopic characterization of the carbon monoxide adductof an alkanethiolate-coordinated heme, CHEM LETT, (7), 2000, pp. 814-815
The CO adduct of a thiolate-coordinated heme was obtained by two different
methods and characterized by UV-vis and resonance Raman spectroscopy. The n
u(Fe-CO) band was observed at 428 cm(-1). The unusually low frequency indic
ates the extremely strong sigma-donation from the thiolate axial ligand to
the heme iron.