Photochemical and Photophysical Properties of Three Carbon-Bridged Fullerene Dimers: C121 (I, II, III)

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• 作者：Tongxiang Ren ; Baoyun Sun ; Zhenling Chen ; Li Qu ; Hui Yuan ; Xingfa Gao ; Shukuan Wang ; Rui He ; Feng Zhao ; Yuliang Zhao ; Zhongshi Liu ; Xiping Jing
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：June 14, 2007
• 年：2007
• 卷：111
• 期：23
• 页码：6344 - 6348
• 全文大小：167K
• 年卷期：v.111,no.23(June 14, 2007)
• ISSN：1520-5207

文摘

The photochemical and photophysical properties of the three C₁₂₁ isomers (I, II, III) were investigated withMADLI-TOF-MS, UV-vis spectra, fluorescence spectra, absorption spectra of their DMA complexes, andtheoretical calculations. The three isomers of C₁₂₁ (I, II, III) have different stabilities under laser irradiation,but isomer I and isomer II show good stability against the heat-induced conversion between differentisomers: No conversion between the isomers was found after heating the mixture of isomer I and isomer IIat 353 K for 12 h in Ar atmosphere. The results of UV-vis absorption and fluorescence spectra indicate thatinteractions between two C₆₀ moieties of C₆₀=C=C₆₀ in the ground and singlet states are not significant, C₁₂₁(I, II, III) behaves as an electron-acceptor similar to C₆₀. These indicate that the formation of the fullerenechain structure (e.g., C₆₀=C=C₆₀) does not disturb the photochemical and photophysical properties of theC₆₀ monomer itself, even that the properties were enhanced by the formation of the polymer. This is significantfor the C₆₀ polymer in photochemical or photoelectronic applications in which C₆₀=C=C₆₀ can be an excellentbasic unit of polymers.