Citation: ZHANG Hui, ZENG Li-Li, WANG Yue-Kui, CAO Shi, GUO Dong, LI Dan, FANG Xue-Ming, LIN Li-Rong. 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 Physico-Chimica Sinica, ;2015, 31(12): 2229-2250. doi: 10.3866/PKU.WHXB201510301 shu

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

ZHANG Hui ^1,, ,
ZENG Li-Li ¹ ,
WANG Yue-Kui ^2,, ,
CAO Shi ¹ ,
GUO Dong ¹ ,
LI Dan ¹ ,
FANG Xue-Ming ¹ ,
LIN Li-Rong ^1,,

1.
1 Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China;
2.
2 Key Laboratory of Chemical Biology and Molecular Engineering of the Ministry of Education, Institute of Molecular Science, Shanxi University, Taiyuan 030006, P. R. China

Corresponding author: ZHANG Hui, WANG Yue-Kui, LIN Li-Rong,
Received Date: 9 September 2015
Available Online: 9 September 2015
Fund Project: 国家自然科学基金(21273175, 21273139, 21271150)资助项目 (21273175, 21273139, 21271150)

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.
- Salen-based Ni(Ⅱ) complex,
- Electronic circular dichroism,
- Solid-state chiroptical spectroscopy,
- Absolute configuration correlation,
- Fingerprint technique
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沈阳化工大学材料科学与工程学院沈阳 110142