Structural analysis of 2-(2-thienyl)-1-(2-pyrazinyl)ethene [C10H8N2S] and 2-(2-thienyl)1-(2-quinoxalinyl)ethene [C14H10N2S]

被引：8
|
作者：
Ichharam, V [1 ]
Boeyens, JCA [1 ]
机构：
[1] Univ Pretoria, Dept Chem, ZA-0002 Pretoria, South Africa
来源：
CRYSTAL ENGINEERING | 2001年 / 4卷 / 2-3期
基金：
美国安德鲁·梅隆基金会;
关键词：
disorder; nonlinear optics;
D O I：
10.1016/S1463-0184(01)00011-9
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The crystal structures of the 2-(2-thienyl)-1-(2-pyrazinyl)ethene (TPE) and 2-(2-thienyl)-1-(2-quinoxalinyl)ethene (TQE) have been studied by single crystal x-ray diffraction. Both the structures exhibit whole molecule disorder and each structure consists of two conformers, related to each other by approximate two fold rotation of one of the heterocyclic units, about a plane defined by the pi unit linking the electron rich (sulfur) heterocycle to the electron poor (nitrogen) heterocycle. TPE and TQE crystalize in the centrosymmetric space groups Pbca and C2/c respectively, consequently they will not be suitable candidates for second order NLO activity in the condensed phase. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：171 / 178
页数：8
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