作者:V.V. Krishnan、Salvador Vazquez、Kalyani Maitra、Santanu Maitra
DOI:10.1016/j.cplett.2017.10.013
日期:2017.12
temperatures. This conformational adaptation is unique to o-DBET, while the corresponding meta- and para- forms do not show such behavior. Variable-temperature (VT) NMR, two-dimensional exchange spectroscopy (EXSY), and qualitative molecular modeling studies are used to demonstrate how multiple competing interactions such as restricted amide rotation and steric hindrance effects can lead to versatile
CN键的特性直接取决于由电子的离域氮孤对驱动的共振贡献结构。在N,N-二苄基-邻甲苯酰胺(o- DBET)的情况下,该分子采用具有独特的NMR光谱特征的构象子亚群,尤其是在低温下。这种构象适应是o -DBET特有的,而相应的meta-和para-表格不显示这种行为。可变温度(VT)NMR,二维交换光谱(EXSY)和定性分子建模研究用于证明多重竞争性相互作用(例如受限制的酰胺旋转和位阻效应)如何导致溶液状态下的多种分子适应。