Unusual structural distortions induced by charge-transfer interactions through conjugated molecules: crystal structures of NH2(C6H4)(C.tplbond.C)n(C6H4)NO2 (n = 0-3)
作者:Eva M. Graham、Vincent M. Miskowski、Joseph W. Perry、Daniel R. Coulter、A. E. Stiegman、William P. Schaefer、Richard E. Marsh
DOI:10.1021/ja00206a001
日期:1989.11
A detailed structural analysis of the series of donor-acceptor molecules O2NC6H4(C~C),C6H4NH2 (n = 0-3) has been performed in order to investigate ground-state donor-acceptor interactions through a conjugated framework. The results of the investigation reveal an unusual bonding pattern that is not adequately explained by a simple quinonoid resonance structure resulting from bond migration through the
对一系列供体-受体分子 O2NC6H4(C~C)、C6H4NH2 (n = 0-3) 进行了详细的结构分析,以通过共轭框架研究基态供体-受体相互作用。研究结果揭示了一种不寻常的键合模式,该模式无法通过键迁移通过共轭骨架产生的简单醌型共振结构充分解释。相反,电荷转移特性仅通过硝基苯基和氨基苯基官能团本身的醌类扭曲表现出来。提供了表明电荷转移的分子内起源的证据。必须参与电荷迁移的乙炔桥本身在结构上没有改变。这些观察得出的结论是,基态中的电荷转移特性不是高度离域的,而是导致电荷集中在受体轨道中。从 n = 1-3 的化合物中观察到弱粉末二次谐波的产生。这是相对于单晶 X 射线结构进行讨论的。
A series of donor-acceptor molecules of the form NH2(C6H4)(C.tplbond.C)n(C6H4)NO2. Unusual effects of varying n
作者:A. E. Stiegman、Vincent M. Miskowski、Joseph W. Perry、Daniel R. Coulter
DOI:10.1021/ja00253a070
日期:1987.9
Liquid crystals for non-linear optics: mesophases formed by push–pull stilbenes and diacetylenes
The push–pullstilbene and diacetylene derivatives (1f–h) and (2c–k) display nematic and smectic phases, which may be of special interest for their non-linear optical properties.