Synthesis and Characterization of Alkanethiolate-Coordinated Iron Porphyrins and Their Dioxygen Adducts as Models for the Active Center of Cytochrome P450: Direct Evidence for Hydrogen Bonding to Bound Dioxygen
verified by RR spectroscopy. When all hydroxyl groups were deuterated, only the frequencies of the nu(O--O) bands were upshifted by 2 cm(-1) without any perturbation in the porphyrin skeleton. This work shows the first directevidence for a hydrogenbond to dioxygen in an oxy form of a thiolate-coordinated heme modelsystem. These results are discussed in context of the process of dioxygen binding and