Mesoscopic Donor−Acceptor Multilayer by Ultrahigh-Vacuum Codeposition of Zn-Tetraphenyl-Porphyrin and C70

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• 作者：Paolo Vilmercati ; Carla Castellarin-Cudia ; Ralph Gebauer ; Prasenjit Ghosh ; Silvano Lizzit ; Luca Petaccia ; Cinzia Cepek ; Rosanna Larciprete ; Alberto Verdini ; Luca Floreano ; Alberto Morgante ; Andrea Gold
• 刊名：Journal of the American Chemical Society
• 出版年：2009
• 出版时间：January 21, 2009
• 年：2009
• 卷：131
• 期：2
• 页码：644-652
• 全文大小：432K
• 年卷期：v.131,no.2(January 21, 2009)
• ISSN：1520-5126

文摘

The peculiar electrochemical and photophysical properties of porphyrin and fullerene molecules make them promising candidates for the construction of two- and three-dimensional organic-based materials. An important question is how pristine fullerene and porphyrin will organize when deposited on surfaces via in vacuum molecular beam evaporation. Here we show that codeposition of C₇₀ and Zn-tetraphenyl-porphyrin (ZnTPP) induces the self-assembly of electron-rich flat aromatic molecules at the curved surface of C₇₀, thus enhancing the chromophore interaction and forming a supramolecular multilayer donor−acceptor structure. While the ground-state electronic spectra almost reflect a simple summation of ZnTPP and C₇₀ components, the excited-state electrons at the porphyrin macrocycle can rapidly delocalize to the fullerene. The excited charge transfer time scale is faster than 1−2 fs, as shown by resonant photoemission for the core-excited charges.