Synthesis and Photophysical Properties of a Supramolecular Host鈥揋uest Assembly Constructed by Fullerenes and Tryptamine Modified Hypocrellin

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• 作者：Zhize Ou ; Helin Jin ; Yunyan Gao ; Shayu Li ; Haixia Li ; Yi Li ; Xuesong Wang ; Guoqiang Yang
• 刊名：The Journal of Physical Chemistry B
• 出版年：2012
• 出版时间：February 23, 2012
• 年：2012
• 卷：116
• 期：7
• 页码：2048-2058
• 全文大小：653K
• 年卷期：v.116,no.7(February 23, 2012)
• ISSN：1520-5207

文摘

The metal coordination polymer of hypocrellin A bearing tryptamine motif (M鈥揇TrpHA) can include fullerene via a two-point interaction, involving 蟺鈥撓€ stacking and electron donor鈥揳cceptor interaction. The 1:1 host鈥揼uest system M鈥揇TrpHA/fullerene exhibits a moderate association constant K_a (6.62 脳 10⁴ to 6.46 脳 10⁵ M^鈥?). Both of the metal ions in M鈥揇TrpHA and the substituents connected to the fullerene core play important roles in stabilizing the M鈥揇TrpHA/fullerene complex. Transient absorption spectral and NIR absorption spectral results demonstrate that, in the M鈥揇TrpHA/fullerene system, efficient photoinduced electron transfer from the tryptamine group in M鈥揇TrpHA to fullerene may occur, resulting in a long-lived fullerene anion radical. The observed order of quantum yield (桅_ET^T) and rate constants (K_ET^T) for electron transfer via ³C₆₀* is Y³⁺鈥揇TrpHA > La³⁺鈥揇TrpHA > DTrpHA, consistent with their binding ability to C₆₀. The nanostructure of M鈥揇TrpHA is rearranged to form an interpenetrating network after interaction with fullerene.