含噻吩环的吡啶Ru(II)配合物的电子结构和非线性光学性质

doi:10.3866/PKU.WHXB20110236

物理化学学报 >> 2011, Vol. 27 >> Issue (02): 315-321.doi: 10.3866/PKU.WHXB20110236

含噻吩环的吡啶Ru(II)配合物的电子结构和非线性光学性质

孙秀欣, 刘艳, 赵海波, 孙世玲, 刘春光, 仇永清

东北师范大学化学学院，功能材料化学研究所，长春 130024

收稿日期:2010-09-20 修回日期:2010-12-02 发布日期:2011-01-25
通讯作者: 仇永清 E-mail:qiuyq466@nenu.edu.cn
基金资助:
国家自然科学基金(20873017)和吉林省自然科学基金(20101154)资助项目

Electronic Structures and Nonlinear Optical Properties of Pyridine- Based Ru(II) Complexes Containing Thiophene Rings

SUN Xiu-Xin, LIU Yan, ZHAO Hai-Bo, SUN Shi-Ling, LIU Chun-Guang, QIU Yong-Qing

Institute of Functional Material Chemisty, Faculty of Chemistry, Northeast Normal University, Changchun 130024, P. R. China

Received:2010-09-20 Revised:2010-12-02 Published:2011-01-25
Contact: QIU Yong-Qing E-mail:qiuyq466@nenu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (20873017) and Natural Science Foundation of Jilin Province, China (20101154).

摘要/Abstract

摘要：

采用密度泛函理论(DFT) B3LYP方法对含有噻吩环的吡啶Ru(II)配合物的电子结构和非线性光学(NLO)性质进行理论研究. 结果表明: 配合物[Ru^II(NH₃)₅L]²⁺(L为含噻吩环的有机基团)中, 配位原子与中心金属离子间没有形成稳定的化学键, 但存在较强的供体-受体(D-A)相互作用; NH₃被羰基(CO)取代后, Ru-C间形成了稳定的σ-π配键, 降低了受体的空轨道能级. 噻吩环的增加增大了体系的共轭程度, 有利于分子内电荷转移, 使配合物的极化率α和一阶超极化率β明显增加. 结合配合物的前线分子轨道分析发现, 电荷转移过程中, 对体系二阶NLO系数贡献较大的是配体内电荷转移(ILCT)和配体间电荷转移(LLCT)跃迁, 羰基引入后配体到金属的电荷转移(LMCT)使配合物[Ru^II(CO)₅L]²⁺比对应的配合物[Ru^II(NH₃)₅L]²⁺的β值增大约7倍.

关键词: 密度泛函理论, 吡啶Ru(II)配合物, 电子结构, 非线性光学性质

Abstract:

Density functional theory (DFT) with the B3LYP functional was used to investigate the electronic structures and nonlinear optical (NLO) properties of a series of pyridine-based Ru(II) complexes containing thiophene rings. The results indicate that stable chemical bonds do not form between the coordinated atoms and the metal ion for [Ru^II(NH₃)₅L]²⁺ (L: organic groups containing the thiophene ring) complexes. However, strong donor-acceptor (D-A) interactions do exist. The Ru(II) and carbon atoms form stable σ-π coordinated bonds after NH3 is substituted by CO, which decreases the unoccupied orbital energies of the acceptor groups. The degree of system conjugation increases because of an increase in the number of thiophene rings, which is favorable for intramolecule charge transfer. The polarizability α and the first-order hyperpolarizability β values of all the systems are enhanced significantly because of the abovementioned reasons. According to the frontier molecular orbitals, the contribution to the second-order NLO coefficient mainly comes from an intraligand charge transfer (ILCT) and an interligand charge transfer (LLCT). The introduction of CO increases the β value for the [Ru^II(CO)₅L]²⁺ complex about seven times compared with the [Ru^II(NH₃)₅L]²⁺ analogue, which can be attributed to a ligand-to-metal charge transfer (LMCT).

Key words: Density functional theory, Pyridine-based Ru(II) complex, Electronic structure, Nonlinear optical property

孙秀欣, 刘艳, 赵海波, 孙世玲, 刘春光, 仇永清. 含噻吩环的吡啶Ru(II)配合物的电子结构和非线性光学性质[J]. 物理化学学报, 2011, 27(02), 315-321. doi: 10.3866/PKU.WHXB20110236

SUN Xiu-Xin, LIU Yan, ZHAO Hai-Bo, SUN Shi-Ling, LIU Chun-Guang, QIU Yong-Qing. Electronic Structures and Nonlinear Optical Properties of Pyridine- Based Ru(II) Complexes Containing Thiophene Rings[J]. Acta Phys. -Chim. Sin. 2011, 27(02), 315-321. doi: 10.3866/PKU.WHXB20110236

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20110236

https://www.whxb.pku.edu.cn/CN/Y2011/V27/I02/315

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含噻吩环的吡啶Ru(II)配合物的电子结构和非线性光学性质

Electronic Structures and Nonlinear Optical Properties of Pyridine- Based Ru(II) Complexes Containing Thiophene Rings

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