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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Conformational change of a chiral Schiff base Ni(ii) complex with a binaphthyl moiety: Application of vibrational circular dichroism spectroscopy
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Conformational change of a chiral Schiff base Ni(ii) complex with a binaphthyl moiety: Application of vibrational circular dichroism spectroscopy

机译:具有双萘基部分的手性席夫碱Ni(ii)配合物的构象变化:振动圆二色光谱的应用

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摘要

Vibrational circular dichroism (VCD) spectroscopy was applied to study the structural change of a Ni(ii) complex (denoted by [Ni(ii)L]) with a chiral Schiff base ligand, (R)- or (S)-2,2′-bis(salicylideneamino)-1,1′- binaphthyl (denoted by H2L), in solution. The major signals in the mid-IR region were assigned on the basis of comparison with the DFT-calculated spectra. The complex transformed reversibly between the square-planar, tetrahedral and octahedral configurations, depending on solvents and temperature. The observed changes in the VCD peaks accompanying the transformation were analyzed in terms of the conformational change of the chiral ligand with a focus on the twisting angle in the Schiff base backbone and the dihedral angle of the binaphthyl group.
机译:使用振动圆二色性(VCD)光谱研究具有手性席夫碱配体(R)-或(S)-2的Ni(ii)配合物(用[Ni(ii)L]表示)的结构变化,溶液中的2'-双(水杨亚氨基)-1,1'-联萘基(以H2L表示)。在与DFT计算的光谱进行比较的基础上,分配了中红外区域的主要信号。取决于溶剂和温度,该络合物在正方形,四面体和八面体构型之间可逆转换。根据手性配体的构象变化,分析了伴随转化而来的VCD峰的变化,重点是席夫碱骨架的扭转角和联萘基的二面角。

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