Circular Dichroism and TDDFT Investigation of Chiral Fluorinated Aryl Benzyl Sulfoxides
作者:Roberto Berardozzi、Ciro A. Guido、Maria Annunziata M. Capozzi、Cosimo Cardellicchio、Lorenzo Di Bari、Gennaro Pescitelli
DOI:10.1002/ejoc.201500648
日期:2015.9
A series of ten chiral aryl benzyl sulfoxides with perfluorinated aryl or benzyl rings, obtained by enantioselective oxidation of sulfides, has been investigated by means of electronic circular dichroism (ECD) spectroscopy and time-dependent DFT (TDDFT) calculations. The (per)fluorination of the aromatic rings has a large impact on the conformer population, the molecular orbitals shape, and the character
已经通过电子圆二色性 (ECD) 光谱和时间相关 DFT (TDDFT) 计算研究了通过硫化物的对映选择性氧化获得的一系列 10 种具有全氟化芳基或苄基环的手性芳基苄基亚砜。芳环的(全)氟化对构象异构体群、分子轨道形状和电子跃迁特征有很大影响。在这个系列中,负责“亚砜主”CD 带的跃迁具有大的电荷转移 (CT) 特征,如 CT 度量指数 ΓNTO 所示。因此,诸如 B3LYP 之类的全局 DFT 混合体在激发态的预测方面很不准确;尽管如此,通过使用范围分离的泛函(例如 CAM-B3LYP)可以实现 CD 光谱的正确模拟。