Photoinduced Processes of Supramolecular Nanoarrays Composed of Porphyrin and Benzo[ghi]perylenetriimide Units through Triple Hydrogen Bonds with One‐Dimensional Columnar Phases |
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| Authors: | Dr. Hayato Sakai Prof. Kei Ohkubo Prof. Shunichi Fukuzumi Prof. Taku Hasobe |
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| Affiliation: | 1. Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Kanagawa, Japan;2. Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA and SENTAN Japan Science and Technology Agency (JST), Suita, Osaka, Japan;3. Department of Chemistry and Nano Science, Ewha Womans University, Seoul, Korea;4. Faculty of Science and Engineering, ALCA and SENTAN, Japan Science and Technology Agency (JST), Meijo University, Nagoya, Aichi, Japan |
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| Abstract: | One‐dimensional supramolecular columnar phases composed of porphyrins (electron donor: D) and benzo[ghi]perylenetriimides (electron acceptor: A) through triple hydrogen bonds have been successfully constructed to perform sequential light‐harvesting and electron‐transfer processes. A series of benzo[ghi]peryleneimide derivatives have been synthesized to examine the substituent effects such as imide and nitrile groups on the spectroscopic and electrochemical properties. Then, formation of the 1:1 supramolecular complex between zinc porphyrin and benzo[ghi]perylenetriimide derivatives through triple hydrogen bonds was confirmed by Job's plot of 1H NMR titration. Next, the one‐dimensional supramolecular nanoarrays were successfully prepared in a mixed solvent. X‐ray diffraction (XRD) measurement suggested that these nanoarrays contained one‐dimensional columnar phases composed of stacked donor and acceptor layers. Finally, femtosecond transient absorption and electron spin resonance (ESR) measurements clearly indicated that photoinduced electron transfer occurred via the singlet excited states in the supramolecular columns. |
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| Keywords: | benzo[ghi]perylenetriimide donor– acceptor systems photoinduced electron transfer porphyrin supramolecular assembly |
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