Effect of Alkyl Chain Length and Linker Atom on the Crystal Packing in 6,12-Dialkoxy- and 6,12-Dialkylsulfanyl-Benzo[1,2-<i>b</i>:4,5-<i>b</i>′]bis[<i>b</i>]benzothiophenes
作者:Shahzad Riaz、Mark Edgar、Mark R. J. Elsegood、Lynne Horsburgh、Simon J. Teat、Thomas G. Warwick、George W. Weaver
DOI:10.1021/acs.cgd.9b00644
日期:2019.9.4
analysis revealed that all but two compounds crystallize in the triclinic space group P1. Two compounds were obtained as monoclinic crystals with space group P21/c. The alkoxy substituted compounds adopted a molecular conformation with a step from the core and a gauche conformation about the C1′–C2′ bond placing the alkyl chains close to parallel with the pentacyclic arene ring system, whereas in the alkylsufanyl
改变链长对6,12-二烷氧基和6,12-二烷基硫烷基-苯并[1,2- b:4,5- b ']双[ b ]苯并噻吩的固态构象和堆积的影响研究过。这些化合物是通过6,12-二氟苯并[1,2- b:4,5- b ']双[ b ]苯并噻吩与衍生自C 7 -C 10醇和链烷硫醇的醇盐或链烷硫醇的S N Ar反应制备的。单晶X射线衍射分析表明,除两种化合物外,所有其他化合物均在三斜晶空间群P 1中结晶。获得了两个化合物,其单斜晶体的空间群为P2 1 / c。烷氧基取代的化合物采用离核一步一步的分子构象和关于C1'–C2'键的gauche构象,使烷基链与五环芳烃环体系平行,而在烷基磺酰基衍生物中,烷基链为硫原子排列成与环的平面强烈偏离,且硫原子与烷基链的C3'垂直。NMR测量CDCl 3中的T1弛豫表明,烷氧基和烷基硫烷基取代基均在环境温度下在溶液中自由旋转,表明固态链的取向是由于结晶过程中的堆积相互作用。