Tuning Wavefunction Mixing in Push-Pull Molecules: From Neutral to Zwitterionic Compounds
作者:Amedeo Capobianco、Antonio Esposito、Tonino Caruso、Fabio Borbone、Antonio Carella、Roberto Centore、Andrea Peluso
DOI:10.1002/ejoc.201200161
日期:2012.5
A new push–pull molecule, containing an (alkylamino)thiophene as electron donor and 1,3-bis(dicyanomethylidene)-2-indenylindene as electron acceptor, has been synthesized and characterized in the solid state by X-ray crystallography, in solution by UV/Vis and NMR spectroscopy and by theoretical calculations. The quinoidal zwitterionic form of this compound was underscored both in the solid state and
一种新的推挽式分子,含有(烷基氨基)噻吩作为电子供体和 1,3-双(二氰基亚甲基)-2-茚作为电子受体,已合成并通过 X 射线晶体学在固态溶液中表征通过紫外/可见光和核磁共振光谱和理论计算。该化合物的醌型两性离子形式在固态和中等极性溶剂中均得到强调。还对两个相似的推拉分子进行了实验和理论分析,它们有选择地改变基本化学特征,例如芳香基团的共振能和吸引子的位阻。三种化合物的比较分析表明,空间位阻、共振能量和环境的极性在使一种限制共振形式稳定在另一种上方面起着重要作用。通过改变这些化学变量,微调推挽分子的电子基态,从中性芳香形式到电荷分离的两性离子,通过两种限制形式贡献几乎相等的形式(花青极限) , 可以实现。