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Conformational study of an axially chiral salen ligand in solution using two-photon circular dichroism and the fragment-recombination approach

机译:轴向手性salen配体在溶液中的构型研究,采用双光子圆二色性和碎片重组方法

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摘要

Herein we report on the conformational study of a chiral Salen ligand, AFX-155, in THF solution using two-photon absorption (TPA) and, even more importantly, two-photon circular dichroism (TPCD). The fragment-recombination approach (FRA), employed to perform computations on half-AXF-155 (AXF-169′) and the center (C-AXF-155), allowed us to overcome the current computational limitations found in calculations of the TPCD spectra of large molecules. The comparative experimental-theoretical analysis of AXF-155 showed that its TPA is mainly determined by AXF-169′ and validated, through TPCD, the presence of the two dominant Trans-R-Intra(NHB)//Trans-R-Extra(HB) and Trans-R-Intra(NHB)//Trans-R-Extra(NHB) structure in THF with a ΔΔ propeller chirality on the diphenylamine moieties at the end of each AXF-169′. The application of FRA for the analysis of the TPCD spectra of large chiral molecules has been proven to be effective.
机译:本文中,我们报告了使用两光子吸收(TPA),甚至更重要的是,两光子圆二色性(TPCD)在THF溶液中手性Salen配体AFX-155的构象研究。片段重组方法(FRA)用于对半AXF-155(AXF-169')和中心(C-AXF-155)进行计算,从而使我们能够克服TPCD计算中存在的当前计算限制大分子的光谱。 AXF-155的对比实验理论分析表明,其TPA主要由AXF-169'确定,并通过TPCD验证了两个主要的Trans-R-Intra(NHB)// Trans-R-Extra( HB)和THF中的反式-R-Intra(NHB)//反式-R-Extra(NHB)结构,每个AXF-169'末端的二苯胺部分均具有ΔΔ螺旋桨手性。已证明将FRA用于分析大手性分子的TPCD光谱是有效的。

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