作者:Melissa A. Stokes、Refik Kortan、Sandrine Rivillon Amy、Howard E. Katz、Yves J. Chabal、Christian Kloc、Theo Siegrist
DOI:10.1039/b701035d
日期:——
The crystal structure of phenylene–bithiophene oligomers (PTTP) has been investigated by powder X-ray diffraction measurements and ab initio Monte Carlo modelling. Two new hydroxyl-terminated PTTP powders, 5,5′-bis-4-(6-hydroxyhexyloxy)-phenyl-2,2′-bithiophene and the shorter alkyl chain substituted oligomer 5,5′-bis(4-hydroxyphenyl)-2,2′-bithiophene, are compared to single crystals of 5,5′-bis(4-ethylphenyl)-2,2′-bithiophene. The new molecules are characterized by a close packed, distorted hexagonal array with tilted short axes in a herringbone-type structure. Neighbouring molecules within layers are displaced along the long axis. Modelling the electrostatic potential surface suggests that electrostatic interactions are responsible for the observed herringbone-like ordering. Alkyl chains facilitate a partial mixing through interdigitation of aromatic and aliphatic moieties.
通过粉末 X 射线衍射测量和从头开始蒙特卡罗建模研究了亚苯基联噻吩低聚物 (PTTP) 的晶体结构。两种新型羟基封端 PTTP 粉末,5,5'-双-4-(6-羟基己氧基)-苯基-2,2'-联噻吩和较短的烷基链取代低聚物 5,5'-双(4-羟基苯基)- 2,2'-联噻吩与 5,5'-双(4-乙基苯基)-2,2'-联噻吩单晶进行比较。这些新分子的特点是紧密堆积、扭曲的六角形阵列,具有倾斜的短轴,呈人字形结构。层内的相邻分子沿长轴位移。对静电势表面进行建模表明,静电相互作用是造成观察到的人字形排序的原因。烷基链通过芳香族和脂肪族部分的交叉促进部分混合。