Abstract
Nanocarbons have attracted tremendous attention, as their extended π-conjugation offers intriguing characteristics in optical and electronic properties. These properties suggest their potential utility as basic components in various electronic devices including light-emitting diodes, solar cells, and field-effect transistors.In this talk, I will give an overview of our recent works focusing on photoinduced electron and energy transfer in nanocarbon-based systems. For instance, excitation of a porphyrin–hexabenzocoronene linked system resulted in selective energy transfer (EnT) from the first singlet excited state (S1) of the hexabenzocoronene to the porphyrin. In contrast, reverse exclusive EnT took place from the first and second singlet excited states (S1 and S2) of the porphyrin to the π-extended hexabenzocoronene in the porphyrin–π-extended hexabenzocoronene linked system. Specifically, ultrafast efficient EnTs from both the S2 and S1 states of the porphyrin to the π-extended hexabenzocoronene are similar to the corresponding ultrafast EnTs from the S2 and S1 states of carotenoids to chlorophylls in natural photosynthesis. Such characteristic photophysical properties will be informative for the elaborated design of nanocarbon-based materials for optoelectronics and solar energy conversion.[1] T. Umeyama, T. Hanaoka, H. Yamada, Y. Namura, S. Mizuno, T. Ohara, J. Baek, J. Park, Y. Takano, K. Stranius, N. V. Tkachenko, H. Imahori, Chem. Sci., 10, 6642 (2019).[2] X. Liu, M. Kozlowska,T. Okkali, D. Wagner,T. Higashino, G. Brenner-Weiß, S. Marschner, Z. Fu, Q. Zhang, H. Imahori, S. Bräse, W. Wenzel,C. Wöll, L. Heinke, Angew. Chem. Int. Ed., 58, 9590 (2019).[3] T. Umeyama, K. Igarashi, D. Sasada, Y. Tamai, K. Ishida, T. Koganezawa, S. Ohtani, K. Tanaka, H. Ohkita, H. Imahori, Chem. Sci., in press.
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