Through-space interactions between parallel-offset arenes at the van der Waals distance: 1,8-diarylbiphenylene syntheses, structure and QM computations
作者:Franco Cozzi、Rita Annunziata、Maurizio Benaglia、Kim K. Baldridge、Gerardo Aguirre、Jesús Estrada、Yongsak Sritana-Anant、Jay S. Siegel
DOI:10.1039/b800031j
日期:——
A model for studying polar–π interactions between arenes spaced at van der Waals distances is developed on the basis of peri-diarylbiphenylenes. A set of 1,8-diarylbiphenylenes is synthesized comprising two Hammett series, one with reference to mesityl ring interactions and the other with reference to pentafluorophenyl ring interactions. X-Ray crystal structures of several derivatives are determined. Barriers to rotation of the probe aryl ring are derived from dynamic NMR data and show a trend for the mesityl reference series (ΔG≠vs. σ°). The model is also used as a test for comparison of modern density functional methods, including B3LYP, M06-2X and BMK functionals; dispersive effects are seen to be an important factor in the proper theoretical treatment of arene interactions.
基于peri-二芳基联苯烯开发了一种研究间距为范德华距离的芳烃之间极-π相互作用的模型。合成了一组1,8-二芳基联苯烯,包含两个Hammett系列,一个以间二甲苯环相互作用为基准,另一个以五氟苯环相互作用为基准。确定了几个衍生物的X射线晶体结构。从动态核磁共振数据中得出了探针芳基环旋转的能垒,并显示出间二甲苯基准系列的趋势(ΔG≠vs. σ°)。该模型还被用作比较现代密度泛函方法(包括B3LYP、M06-2X和BMK泛函)的测试;分散效应被认为是正确理论处理芳烃相互作用的重要因素。