Ultrafast photoinduced electron transfer in face-to-face charge-transfer π-complexes of planar porphyrins and hexaazatriphenylene derivatives

Toru Aoki, Hayato Sakai, Kei Ohkubo, Tomo Sakanoue, Taishi Takenobu*, Shunichi Fukuzumi, Taku Hasobe

*この研究の対応する著者

    研究成果: Article査読

    27 被引用数 (Scopus)

    抄録

    Charge-transfer (CT) π-complexes are formed between planar porphyrins and 1,4,5,8,9,12-hexaazatriphenylene (HAT) derivatives with large formation constants (e.g., 104 M-1), exhibiting broad CT absorption bands. The unusually large formation constants result from close face-to-face contact between two planar π-planes of porphyrins and HAT derivatives. The redox potentials of porphyrins and HAT derivatives measured by cyclic voltammetry indicate that porphyrins and HAT derivatives act as electron donors and acceptors, respectively. The formation of 1:1 CT complexes between porphyrins and HAT derivatives was examined by UV-vis, fluorescence and 1H NMR measurements in nonpolar solvents. The occurrence of unprecedented ultrafast photoinduced electron transfer from the porphyrin unit to the HAT unit in the CT π-complex was observed by femtosecond laser flash photolysis measurements. A highly linear aggregate composed of a planar porphyrin and an HAT derivative was observed by transmission electron microscopy (TEM) and atomic force microscopy (AFM).

    本文言語English
    ページ(範囲)1498-1509
    ページ数12
    ジャーナルChemical Science
    6
    2
    DOI
    出版ステータスPublished - 2015 2 1

    ASJC Scopus subject areas

    • 化学 (全般)

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