芳香性氨基酸的二次谐波非线性光学性质

引用本文: 魏婧, 程文旦. 芳香性氨基酸的二次谐波非线性光学性质[J]. 物理化学学报, 2013, 29(10): 2215-2220. doi: 10.3866/PKU.WHXB201308141 shu

Citation: WEI Jing, CHENG Wen-Dan. Nonlinear Optical Properties：Second Harmonic Generation for Aromatic Amino Acids[J]. Acta Physico-Chimica Sinica, 2013, 29(10): 2215-2220. doi: 10.3866/PKU.WHXB201308141 shu

芳香性氨基酸的二次谐波非线性光学性质

魏婧 ,
程文旦

基金项目:
国家自然科学基金(21173225, 21101156) (21173225, 21101156)

福建省理论与计算化学重点实验室基金项目资助

摘要:

采用密度泛函理论(DFT)-B3LYP方法在6-31G^*基组水平上,对芳香性氨基酸分子体系(Phe, [Phe―H]^-,PheH^*, Tyr, [Tyr―H]^-, TyrH⁺, Trp, [Trp―H]^-和TrpH⁺)进行结构优化. 在优化所得构型的基础上, 利用含时密度泛函理论(TDDFT)-B3LYP在6-31G^*基组上计算了它们的激发态性质,并结合态求和方法研究了它们在二次谐波过程中的二阶极化率值. 同时讨论了二次谐波非线性光学响应的起源及其产生变化的原因. 计算结果表明,相对于中性的氨基酸分子, 去质子化和质子化后的氨基酸分子的二阶极化率值都有明显的增加, 且符合规律Phe < PheH⁺ < [Phe―H]^-和Tyr < TyrH⁺ < [Tyr―H]^-. 通过对它们电极化起源的分析, 我们得到对于中性氨基酸分子, 侧链芳香环上的π→π^*跃迁对二阶极化率起主要贡献; 对去质子化和质子化后的氨基酸分子, 吲哚环上的π→π^*电荷跃迁和α碳原子相连的氨基和羧基基团内电荷跃迁对二阶极化率起到同样重要的贡献.

关键词:

English

Nonlinear Optical Properties：Second Harmonic Generation for Aromatic Amino Acids

WEI Jing ,
CHENG Wen-Dan

1.
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China; University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Received Date: 26 April 2013
Available Online: 26 September 2013
Fund Project:
国家自然科学基金(21173225, 21101156)

福建省理论与计算化学重点实验室基金项目资助

Abstract:

The geometrical structures of a series of neutral, protonated, and deprotonated aromatic amino acids (Phe, [Phe―H]^-, PheH⁺, Tyr, [Tyr―H]^-, TyrH⁺, Trp, [Trp―H]^-, and TrpH⁺) were optimized using density functional theory (DFT)-B3LYP with a 6-31G^* basis set. Based on the optimized structures, the excited state properties were studied using time-dependent DFT at the B3LYP/6-31G^* level. We calculated the second-order polarizabilities for second harmonic generation with the sum-over-states method. We examined the origins of the nonlinear optical responses and determined the cause for the variation in the second-order polarizabilities. Our calculations show that the second-order polarizabilities for protonated, and deprotonated aromatic amino acids are much higher than those for the neutral aromatic amino acids, with the order Phe < PheH⁺ < [Phe―H]^- and Tyr < TyrH⁺ < [Tyr―H]^-. By analyzing their electronic origins, we find that charge transitions in the side chains (benzene, phenol, and indole) make the main contributions to the second-order polarizability for neutral aromatic amino acids. For protonated and deprotonated aromatic amino acids, π→π^* charge transfers within indole rings, and charge transfers within amino groups and the carboxyl groups attached to alpha-carbon atoms make almost identical contributions to the second-order polarizability.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

芳香性氨基酸的二次谐波非线性光学性质

English

Nonlinear Optical Properties：Second Harmonic Generation for Aromatic Amino Acids

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

芳香性氨基酸的二次谐波非线性光学性质

English

Nonlinear Optical Properties：Second Harmonic Generation for Aromatic Amino Acids

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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