The geometry and absorption of diketo-pyrrolo-pyrroles substituted with various aryls
作者:Stanislav Luňák Jr.、Lukáš Havel、Jan Vyňuchal、Petra Horáková、Jiří Kučerík、Martin Weiter、Radim Hrdina
DOI:10.1016/j.dyepig.2009.09.014
日期:2010.4
symmetrical and four unsymmetrical diaryl substituted diketo-pyrrolo-pyrroles was synthesized; two unsymmetrical derivatives are reported for the first time. The relationship between the theoretical excitation energies of the S0 → S1 transition, computed by time dependent density functional theory and the experimental positions of 0–0 vibronic bands in the visible absorption (or fluorescence excitation) spectra
合成了一系列五个对称和四个不对称的二芳基取代的二酮基-吡咯并吡咯;首次报道了两种不对称导数。S 0 →S 1的理论激发能之间的关系研究了由时变密度泛函理论计算的跃迁和可见吸收(或荧光激发)光谱中0-0振动带的实验位置。从溶液或从低温有机溶剂玻璃中获得实验数据,其中在某些情况下,振动结构的进行使得能够正确分配电子子带。理论计算预测,线性红移和高色移将伴随母体3,6-diphenyl-2,5-dihydro-pyrrolo [3,4- c通过为随后的平面衍生物提供更广泛共轭的芳基中心(2-萘基,联苯,二苯乙烯基)来合成]]吡咯-1,4-二酮。定性地,0-0振动子带的实验性红移与理论完全吻合,而高平移受平面对称导数的极低溶解度影响。对于非平面衍生物(芳基= 1,2-苯乙烯基或1-萘基),观察到了与这种理想行为的偏差,对于它们而言,描述芳基的二面角的平面外扭转可能被DFT低估了。