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-  2019 

扶手椅型单壁碳纳米管孔径对缬氨酸分子旋光异构的限域影响 Confinement Effect of the Diameter of Armchair Single-Walled Carbon Nanotubes on Optical Isomerization of Valine Molecules

Keywords: 缬氨酸,旋光异构,单壁碳纳米管,ONIOM方法,密度泛函理论,过渡态,微扰论

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Abstract:

采用量子力学与分子力学组合的ONIOM方法,研究了扶手椅型单壁碳纳米管(SWCNT)孔径对缬氨酸(valine,Val)分子两种构象Val_1和Val_2旋光异构的限域影响。结构分析表明:扶手椅型SWCNT(5,5)的限域作用致Val分子骨架明显形变,同时SWCNT(5,5)也发生了明显形变。势能面研究表明:限域在SWCNT内的Val分子以氨基氮为质子转移桥梁的旋光异构反应通道具有优势;Val_1和Val_2限域在SWCNT(5,5)内,在优势通道上旋光异构决速步骤的内禀能垒分别为340.55和361.13kJ·mol~(-1),限域在SWCNT(6,6)内,在优势通道上旋光异构决速步骤的内禀能垒分别为302.80和293.11kJ·mol~(-1),限域在SWCNT(7,7)内,在优势通道上旋光异构决速步骤的内禀能垒为265.54kJ·mol~(-1)左右。计算结果表明:SWCNT(5,5)的限域作用及其固体溶剂效应对Val分子的旋光异构反应具有显著的阻碍作用,SWCNT(5,5)可以安全地储存光学纯Val

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