We report two corrole based donor–acceptor (D–A) dyads, Cbz-Cor and Ptz-Cor to understand the energy/electron transfer reactions. In these D–A systems, the donor, either carbazole (Cbz) or phenothiazine (Ptz), is covalently connected at the meso-phenyl position of 10-(phenyl)-5,15-bis-(pentafluorophenyl)corrole (Ph-Cor) by C–N linkage. Both the dyads were characterized by ¹H NMR, MALDI-TOF MS, UV-vis, electrochemical, computational methods, study state fluorescence and TCSPC techniques. A comparison of absorption spectra with their reference monomeric compounds (Cbz-Ph, Ptz-Ph and Ph-Cor) revealed minimal ground-state interactions between chromophores in both dyads. Fluorescence studies suggested that singlet–singlet energy transfer from ¹Cbz* to corrole is the major photochemical pathway in the Cbz-Cor dyad with a quenching efficiency of ∼99%. Detailed analysis of the data suggests that Forster’s dipole–dipole mechanism does not adequately explain this energy transfer. However, at a 410 nm excitation, florescence quenching is detected in Ptz-Cor (49%) supporting a photo induced electron transfer (PET) process from the ground state of PTZ to the excited state of corrole macrocycle. The electron-transfer rates (kET) of Ptz-Cor are found in the range 0.6 × 107 to 1.24 × 108s−1 and are concluded to be solvent dependent.

中文翻译：

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咔唑-咯咯和吩噻嗪-咯咯二元中的光诱导分子内能量和电子转移事件

我们报告了两个基于corrole的供体-受体（D-A）二元组，Cbz-Cor和Ptz-Cor了解能量/电子转移反应。在这些 D-A 系统中，供体咔唑 (Cbz) 或吩噻嗪 (Ptz) 在中观10-(苯基)-5,15-双-(五氟苯基)corrole (Ph-Cor)的-苯基位置通过C-N键。这两个对子都通过¹ H NMR、MALDI-TOF MS、UV-vis、电化学、计算方法、研究状态荧光和 TCSPC 技术进行了表征。吸收光谱与它们的参考单体化合物（Cbz-Ph、Ptz-Ph 和 Ph-Cor）的比较揭示了两个二元体中发色团之间的最小基态相互作用。荧光研究表明，从¹ Cbz* 到 corrole 的单线态 - 单线态能量转移是光化学过程中的主要光化学途径。Cbz-Cordyad 的淬火效率为 ～99%。对数据的详细分析表明，福斯特的偶极-偶极机制并不能充分解释这种能量转移。然而，在 410 nm 激发下，荧光猝灭在Ptz-Cor(49%) 支持从 PTZ 的基态到 corrole 大环的激发态的光诱导电子转移 (PET) 过程。电子转移率 (ķ乙吨)的Ptz-Cor在范围内找到0.6 × 107到1.24 × 108s-1并得出结论是溶剂依赖性的。