碘苯
化学
卤键
奎宁
卤素
加合物
非共价相互作用
结晶学
立体化学
光化学
分子
有机化学
氢键
烷基
催化作用
作者
Felix Otte,Johannes Kleinheider,Wolf Hiller,Ruimin Wang,Ulli Englert,Carsten Strohmann
摘要
The halogen bonded adduct between the commonly used constituents quinuclidine and iodobenzene is based on a single weak nitrogen–iodine contact, and the isolation of this adduct was initially unexpected. Iodobenzene does not contain any electron-withdrawing group and therefore represents an unconventional halogen bond donor. Based on excellent diffraction data of high resolution, an electron density study was successfully accomplished and confirmed one of the longest N···I molecular halogen bonds with a distance of 2.9301(4) Å. The topological analysis identified the XB as a directional but weak σ hole interaction and revealed secondary contacts between peripheral regions of opposite charge. These additional contacts and their competition with a nitrogen-based interaction were confirmed by NOESY experiments in solution. Integration enabled us to determine the relative NOE ratios and provided insight regarding the existing interactions.
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