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
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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-[CoⅢ(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.
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