Molecular Assemblies from Imidazolyl-Containing Haloalkenes and Haloalkynes: Competition between Halogen and Hydrogen Bonding
作者:Karim Bouchmella、Bruno Boury、Sylvain G. Dutremez、Arie van der Lee
DOI:10.1002/chem.200601508
日期:2007.7.16
The first network involves N-H...O interactions between nearby morpholinium cations, and the second network is based on N-H...N hydrogen bonding between morpholinium cations and imidazolyl groups. Both hydrogen-bonding schemes are charge-assisted. Halogen bonding is not completely wiped out, however, as the triiodoalkene fragment forms a halogen bond with an iodide anion in its vicinity (d(I...I)=3
据报道,由含咪唑基的卤代烯烃和卤代炔烃构成的分子组装体的结构表征。由1-炔丙基咪唑(1)合成1-(3-碘炔丙基)咪唑(2)和1-(2,3,3-三碘烯丙基)咪唑(5)。在固态下,这些完全有机的模块通过N ... I卤素键相互作用自组装,从而形成聚合物链。相对于先前报告的数据,在2中观察到的N ... I相互作用(d(N ... I)= 2.717 A,角球C(sp)-I ... N = 175.8度)非常强。根据阶数C(sp,N ... I在5(d(N ... I)= 2.901 A,角球C(sp2)-I ... N = 173.6度)中的相互作用较弱)-X <-base> C(sp2)-X <-base。发现化合物5与吗啉碘化物(1)形成1:1共晶体4。在4的X射线晶体研究中,N ... 由于分子的排列是由两个交织的氢键网络控制的,因此表明不存在与5中观察到的相似的I卤素键相互作用。第一个网络涉及附近的吗啉阳离子之间的NH