手性Salen-Ni(Ⅱ)络合物的ECD光谱及其绝对构型关联:可见区第一ECD吸收带的指纹作用

doi:10.3866/PKU.WHXB201510301

摘要/Abstract

摘要：

对系列手性salen-Ni(Ⅱ)络合物的电子圆二色(ECD)光谱及其绝对构型关联进行了概述.根据晶体结构和对固、液ECD光谱的表征,结合理论计算,着重探讨了准平面型手性[Ni(salen)]的固态结构及其在溶液中的绝对构型和优势构象.在此基础上通过若干实例说明了平面四方形[M(salen)]络合物两种绝对构型命名法,并给出了我们的建议.对[Ni(sal-R, R-chxn)] [sal-R, R-chxn = (R, R)-N, N'-双(亚水杨基)-1, 2-二亚氨基环己烷]的二氯甲烷溶液ECD光谱的计算结果表明,可见区第一个ECD吸收带主要是π →d荷移跃迁(LMCT)所致,而不是通常认为的d-d跃迁: [Ni(sal-R, R-chxn)]的绝对构型为Λ,其在可见区第一个ECD吸收带为正.将此ECD指纹应用于具有“闭壳层”电子结构的其它平面型手性[Ni(salen)]和六配位trans-[Co^Ⅲ(salen)L₂]络合物的绝对构型指认,具有一定的普适性.本文的研究结果对于深入理解手性[M(salen)]络合物的配位立体化学、手征光学性质及其手性识别和不对称催化机理具有重要科学意义.

关键词: Salen-Ni(Ⅱ)络合物, 电子圆二色, 固体手性光谱, 绝对构型关联, 指纹技术

Abstract:

A correlation between the electronic circular dichroism (ECD) spectra and the absolute configurations of a serials' chiral salen-Ni(Ⅱ) complexes was investigated. The solid-state structures, absolute configurations, and preferential conformations in solution of quasi-planar chiral [Ni(salen)] complexes were studied using their crystal structures, solid-state and solution ECD spectra in combination with theoretical ECD calculations. Furthermore, two different nomenclatures for the absolute configurations of square-planar [M(salen)] complexes were inspected carefully, and suggestions for proper use of them are discussed. The calculated ECD spectra of [Ni(sal-R, R-chxn)] [sal-R, R-chxn = (R, R)-1, 2-cyclohexylene bis(salicylicdeneiminate)] in dichloromethane solution revealed that the first ECD band in the visible region was dominated by the ligandto-metal charge transfer transition (LMCT), which was incorrectly assigned to a d-d transition in the literature. When the absolute configuration of [Ni(sal-R, R-chxn)] was Λ, the first ECD absorption band in the visible region was positive. This ECD fingerprint is universally applicable for assigning the absolute configurations of other square-planar chiral [Ni(salen)] and six-coordinate trans-[Co^Ⅲ(salen)L₂] complexes with a "closed-shell" electronic structure. This work provides some insight into the coordination stereochemistry and chiroptical properties of chiral [M(salen)] complexes. Additionally, this work is significant for the understanding of chiral recognition and asymmetric catalytic mechanisms.

Key words: Salen-based Ni(Ⅱ) complex, Electronic circular dichroism, Solid-state chiroptical spectroscopy, Absolute configuration correlation, Fingerprint technique

章慧,曾丽丽,王越奎,曹石,郭栋,李丹,方雪明,林丽榕. 手性Salen-Ni(Ⅱ)络合物的ECD光谱及其绝对构型关联:可见区第一ECD吸收带的指纹作用[J]. 物理化学学报, 2015, 31(12), 2229-2250. doi: 10.3866/PKU.WHXB201510301

Hui. ZHANG,Li-Li. ZENG,Yue-Kui. WANG,Shi. CAO,Dong. GUO,Dan. LI,Xue-Ming. FANG,Li-Rong. LIN. Correlation between ECD Spectra and the Absolute Configurations of Chiral Salen-Ni(Ⅱ) Complexes: a Fingerprint Role of the First ECD Band in the Visible Region[J]. Acta Phys. -Chim. Sin. 2015, 31(12), 2229-2250. doi: 10.3866/PKU.WHXB201510301

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201510301

https://www.whxb.pku.edu.cn/CN/Y2015/V31/I12/2229

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