Closely Stacked Oligo(phenylene ethynylene)s: Effect of π-Stacking on the Electronic Properties of Conjugated Chromophores
作者:Subodh P. Jagtap、Sukrit Mukhopadhyay、Veaceslav Coropceanu、Glen L. Brizius、Jean-Luc Brédas、David M. Collard
DOI:10.1021/ja3019065
日期:2012.4.25
In this work, a bicyclo[4.4.1]undecane scaffold is used to hold oligo(phenylene ethynylene) units in a cofacially stacked arrangement along the entire length of the conjugated units. We study the impact that the resulting strong interchain interactions have on the photophysical properties. The length of the individual oligomer branches was varied from three to five rings to investigate the effect of
在这项工作中,使用双环 [4.4.1] 十一烷支架将低聚(亚苯基乙炔)单元沿共轭单元的整个长度以共面堆叠排列。我们研究了由此产生的强链间相互作用对光物理特性的影响。单个低聚物分支的长度从三到五个环不等,以研究共轭对堆叠段的电子特性的影响。吸收和荧光光谱被记录并与相应的未堆叠类似物的那些进行比较。进行了与时间相关的密度泛函理论计算,并有助于使堆叠系统荧光光谱中存在的低能量特征合理化。计算表明,低能量排放是由于准分子态的存在。与三环类似物相比,在五环堆叠系统中观察到的低能荧光带的强度更强,这归因于将局部链内状态与前化合物中的准分子样状态分开的较小的激活屏障。