Department of Chemistry, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan.
Dalton Trans. 2013 May 21;42(19):6873-8. doi: 10.1039/c3dt00112a.
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.
振动圆二色性（VCD）光谱被应用于研究具有手性希夫碱配体（（R）-或（S）-2,2'-双（水杨醛亚胺基）-1,1'-联萘（用 H2L 表示）的 Ni(II)配合物（表示为 [Ni(II)L]）在溶液中的结构变化。根据与 DFT 计算光谱的比较，对中红外区域的主要信号进行了归属。该配合物可根据溶剂和温度在平面四方、四面和八面构型之间可逆转化。对伴随转化的 VCD 峰的观察到的变化进行了分析，这些变化与手性配体的构象变化有关，重点是希夫碱骨架的扭转角和联萘基的二面角。
