Structural effects on the photoelectrochemical properties of new push-pull dyes based on vinazene acceptor triphenylamine donor
作者:Wilmmer A. Arcos、Robson R. Guimarães、Braulio Insuasty、Koiti Araki、Alejandro Ortiz
DOI:10.1016/j.molstruc.2016.01.087
日期:2016.5
behavior of novel dyes, based on vinazene electron-acceptor groups linked to arrays of triphenylamine (TPA) electron-donor group, was studied by electronic absorption and emission spectroscopy, as well as by cyclic voltammetry. The most stable ground state structure and their electronic properties were modeled by density functional theory (DFT) calculations using the B3LYP functional and 6-31G++ basis set
摘要 通过电子吸收和发射光谱以及循环伏安法研究了新型染料的推挽行为,这些染料基于与三苯胺 (TPA) 电子供体基团相连的乙烯烯电子受体基团。最稳定的基态结构及其电子性质通过密度泛函理论 (DFT) 计算使用 B3LYP 泛函和 6-31G++ 基组进行建模,而激发态的电子性质由 TD-DFT 计算,在相同的泛函下和基组,使用 SCF 和 PCM 方法。理论计算与实验数据匹配良好,表明最低能量吸收带的 λmax 可以归因于分子内电荷转移跃迁。实际上,HOMO 和 LUMO 分别位于 TPA 供体和二氰基亚甲基受体部分,证实了显着的推拉特性。光电化学电池参数与染料结构特性相关,表明与通过 CN 基团的氮原子锚定一致。供体-受体基团的性质、构象和锚定 CN 基团的数量(2 个似乎是最好的)强烈影响染料敏化太阳能电池的整体效率。