The NâH stretching vibrations of the oxygenated âhybridâ haemoprotein models with an axial hindered base indicate that there is no conventional hydrogen bond with the terminal oxygen of the FeâO2 moiety, contrary to the models with an axial unhindered base; however, the FeâO2 moiety is highly polarizable as indicated by 17O NMR spectroscopy.
带有轴向受阻碱基的含氧“混合”血红蛋白模型的N-H伸展振动表明,与带有轴向无阻碱基的模型相反,
铁-氧部分末端氧不存在常规氢键;然而,
铁-氧部分具有高度极化性,17O NMR光谱表明了这一点。