Effect of the π-bridge on the light absorption and emission in push-pull coumarins and on their supramolecular organization
作者:Edgar González-Rodríguez、Brenda Guzmán-Juárez、Montserrat Miranda-Olvera、María del Pilar Carreón-Castro、Mauricio Maldonado-Domínguez、Rafael Arcos-Ramos、Norberto Farfán、Rosa Santillan
DOI:10.1016/j.saa.2021.120520
日期:2022.2
directly conjugated (p-phenylene, alkyne, alkene) bridges were synthesized through a convergent strategy. Using an experimentally calibrated computational protocol, their UV–Visible light absorption and emission spectra in solution were investigated. Remarkably, amide-, alkyne- and alkene-bridges undergo comparable vertical excitations. The different nature of these bridges manifests during excited-state
八个π扩展一个家庭推-拉带交叉偶联(酰胺)香豆素和直接缀合(p-亚苯基、炔烃、烯烃) 桥是通过收敛策略合成的。使用实验校准的计算协议,研究了它们在溶液中的紫外-可见光吸收和发射光谱。值得注意的是,酰胺桥、炔桥和烯烃桥经历了类似的垂直激发。这些桥的不同性质在激发态弛豫和荧光期间表现出来。我们预测这些分子可以作为低重组能(低于 0.2 eV)的 p 型半导体的构建单元。由于固态自组装对于此应用至关重要,因此我们检查了 π 桥对此类化合物中超分子组织的影响,以确定这些 π 扩展香豆素衍生物中是否存在堆叠。对亚苯基阻碍平面性但允许容易结晶;烯烃桥连分子避开了所有结晶尝试。获得的所有晶体都具有密集的面对面 π 堆叠,层间距为 3.5-3.7 Å,有望促进固态电荷转移过程。