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[求助] 关于蛋白质红外酰胺一带发生化学位移问题请教

不同溶剂中酶结构变化,左侧数据显示酰胺I带波峰横坐标变化从a到d为1662 cm-1→1652 cm-1→1643 cm-1→1641cm-1发生化学位移。
1.横坐标有大到小变化,这是不是叫做红移?
2.从a到d基本符合我提高立体选择性的实验结果,逐渐提高。1660左右的峰为羰基的伸缩振动峰,如果发生红移我这个该怎么靠在立体选择性上解释?
求前辈指导

关于蛋白质红外酰胺一带发生化学位移问题请教
酰胺I带.png
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