Photoinduced Charge Separation in Cyclohexylidene-Based Donor−(σ-Bridge)−Acceptor Compounds − Building Blocks for Materials
作者:Wibren D. Oosterbaan、Paul C. M. van Gerven、Cornelis A. van Walree、Mattijs Koeberg、Jacob J. Piet、Remco W. A. Havenith、Jan W. Zwikker、Leonardus W. Jenneskens、Rolf Gleiter
DOI:10.1002/ejoc.200200693
日期:2003.8
We describe the syntheses and properties of five semi-rigid donor−(σ-bridge)−acceptor (D−σ−A) compounds. These compounds, which are candidates for incorporation in materials, have aniline-type donors and (mixed) cyano- and alkoxycarbonyl-1,1-difunctionalized vinyl acceptors that are separated by a four-σ-bond bridge. Their electronic properties were studied by means of photoelectron spectroscopy in
我们描述了五种半刚性供体-(σ-桥)-受体(D-σ-A)化合物的合成和性质。这些化合物是加入材料的候选化合物,具有苯胺型供体和(混合)氰基和烷氧基羰基-1,1-双官能化乙烯基受体,它们由四σ键桥隔开。通过光电子能谱结合 ab initio MO 计算、循环伏安法、UV-Vis 吸收光谱、(时间分辨)荧光光谱和时间分辨微波电导率(TRMC)研究了它们的电子性质。我们发现这些 D-σ-A 化合物表现出弱的分子内电荷转移吸收带,其强度来自局部跃迁。在光激发时,以几乎定量的产率产生电荷分离状态。对于在非极性溶剂中具有双氰基乙烯基受体的两种 D-σ-A 化合物,发生这种状态的构象收缩或“折叠”。在具有烷氧基羰基官能化受体的化合物中不存在折叠归因于电荷分离状态的寿命缩短。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)