基于非手性邻苯酚胺衍生物的半醌Fe(III)络合物的镜面对称性破缺及其绝对构型关联

doi:10.3866/PKU.WHXB201304122

摘要/Abstract

摘要：

以2- 苯胺基-4,6- 二叔丁基苯酚(H₂L)和FeCl₂·4H₂O为原料制备了一对手性半醌Fe(III) 络合物Λ-mer-[Fe(L^ISQ)₃]和Δ-mer-[Fe(L^ISQ)₃] (L^ISQ: 2-苯亚胺基-4, 6-二叔丁基苯酚, mer: 经式构型), 通过单晶X射线衍射分析结合单晶压制片膜的固体圆二色(CD)光谱确定了该络合物的绝对构型, 在此基础上建立了此类半醌络合物[M(L^I^SQ)₃] (M=Cr, Fe, Co)的惟手性金属中心绝对构型与固体CD光谱之间的关联. 此外, 还对10份合成的[Fe(L^ISQ)₃]的大宗产物粉末与单晶的固体CD谱进行了比对分析, 以及对1 份合成产物进行10 次重结晶的固体CD 光谱表征. 研究表明该化合物在结晶过程中发生了镜面对称性破缺(MSB), 对映体过量(ee) 值在15%-100%之间.

关键词: 半醌Fe(III)络合物, 镜面对称性破缺, 绝对构型, 固体CD光谱, 单晶X射线衍射

Abstract:

A pair of chiral o-iminobenzosemiquinonato Fe(III) complexes, Λ-mer- [Fe(L^ISQ)₃] and Δ-mer-[Fe(L^ISQ)₃] (L^ISQ: 2-phenylimino-4, 6-di-tert-butylphenol, mer: meridian configuration), were synthesized from 2-anilino-4,6-di-tert-butylphenol (H₂L) and FeCl₂·4H₂O. Their absolute configurations were determined by single crystal X-ray diffraction (XRD) and solid-state circular dichroism (CD) spectra (the same single crystal for XRD was dispersed in KCl). Correlations between the absolute configurations of the chiral-atmetal o-iminobenzosemiquinonato M(III) complexes [M(L^ISQ)₃] (M=Cr, Fe, Co) and their solid-state CD spectra were also established. Comparison between solid-state CD spectra of the bulk samples from 10 different syntheses and their single crystals were thoroughly analyzed. The solid-state CD spectra of the powdered samples from 10 different crystallizations of one product were characterized. These studies indicated that mirror symmetry breaking (MSB) occurred during the crystallization process of the Fe(III) complexes and their enantiomeric excess (ee) values were between 15% and 100%.

Key words: Semiquinone Fe(III) complexes, Mirror symmetry breaking, Absolute configuration, Solid-state CD spectroscopy, Single crystal X-ray diffraction

赵檑, 万仕刚, 陈成栋, 林以玑, 方雪明, 章慧. 基于非手性邻苯酚胺衍生物的半醌Fe(III)络合物的镜面对称性破缺及其绝对构型关联[J]. 物理化学学报, 2013, 29(06), 1183-1191. doi: 10.3866/PKU.WHXB201304122

ZHAO Lei, WAN Shi-Gang, CHEN Cheng-Dong, LIN Yi-Ji, FANG Xue-Ming, ZHANG Hui. Mirror Symmetry Breaking and Absolute Configuration Correlations of Fe(III) Complexes with Achiral Substituted o-Iminobenzosemiquinonato Ligands[J]. Acta Phys. -Chim. Sin. 2013, 29(06), 1183-1191. doi: 10.3866/PKU.WHXB201304122

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201304122

https://www.whxb.pku.edu.cn/CN/Y2013/V29/I06/1183

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