Cooperative halogen bonding and polarized π-stacking in the formation of coloured charge-transfer co-crystals
作者:Chideraa I. Nwachukwu、Zachary R. Kehoe、Nathan P. Bowling、Erin D. Speetzen、Eric Bosch
DOI:10.1039/c8nj00693h
日期:——
isomeric 4-(N,N-dimethylamino)phenylethynylpyridines and the electron poor halogen bond donor, 1-(3,5-dinitrophenylethynyl)-2,3,5,6-tetrafluoro-4-iodobenzene. The red 1 : 1 cocrystals exhibit strong halogen bonding and strong π-stacking. The N⋯I distances range from 2.80 to 2.85 Å and the C–I⋯N angles are between 169.9 and 175.8°. In all four structures the donor and acceptor molecules are alternately
在匹配的互补富电子卤素键受体,异构体4-(N,N-二甲基氨基)苯基乙炔基吡啶和贫电子卤素键供体1-(3,5-二硝基苯基乙炔基)-2,3,5之间形成红色共晶体,6-四氟-4-碘苯。红色的1:1共晶表现出强卤素键和强π堆积。N⋯I距离范围为2.80至2.85Å,C–I⋯N角度在169.9至175.8°之间。在所有四个结构中,供体和受体分子交替π-堆叠,二硝基苯基部分和二甲基氨基苯基部分之间的质心到质心距离为3.61至3.73。所计算出的π-π堆叠结合能为-22.24千卡摩尔-1为4- [4-(之间的复杂Ñ,N-二甲氨基)苯基乙炔基]吡啶和1-(3,5-二硝基苯基乙炔基)-2,3,5,6-四氟-4-碘代苯,而相同对之间的卤键结合能为−7.97 kcal mol -1。