Crystal structures of fluorinated aryl biscarbonates and a biscarbamate: a counterpoise between weak intermolecular interactions and molecular symmetry
作者:Amol G. Dikundwar、Ch. Venkateswarlu、Ross O. Piltz、Srinivasan Chandrasekaran、Tayur N. Guru Row
DOI:10.1039/c0ce00537a
日期:——
adopts a non-centrosymmetric “twisted” (syn) conformation, whereas 2, 3 and 4 acquire a centrosymmetric “extended” (anti) conformation. Weak intermolecular interactions and in particular those involving fluorine are found to dictate this conformational variation in the crystal structure of 1. A single-crystal neutron diffraction study at 90 K was performed on 1 to obtain further insights into these interactions
已探究了三个碳酸氢芳基酯和具有可变间隔基长度的刚性炔属单元的碳酸氢芳基芳基酯的构象特征和超分子结构组织,以深入了解与分子对称性相关的堆积特征以及涉及“有机”氟的分子间相互作用。四个结构,但-2-炔基-1,4-二基双(2,3,4,5,6-五氟苯基碳酸酯),1 ; 丁-2-炔基-1,4-二烷基双(4-氟代碳酸苯酯),2 ;丁-2-炔基-1,4-二基双(2,3,4,5,6-五氟苯基氨基甲酸酯),3和己-2,4-二炔-1,6-二基双(2,3,4,5,6-五氟苯),4已经在这种情况下进行分析。化合物1采用非中心对称“扭曲”(顺式)构象,而2,3和4获得中心对称“扩展”(反)构象。发现分子间的相互作用较弱,尤其是涉及氟的分子间相互作用决定了1的晶体结构中的这种构象变化。对1进行了90 K的单晶中子衍射研究,以进一步了解涉及“有机”氟的这些相互作用。