Photoinduced Electron Transfer in a Supramolecular Nanohybrid Between a Carbon Nanohorn with an NH3+ Moiety and C60 with a Crown Ether Moiety
Photoinduced Electron Transfer in a Supramolecular Nanohybrid Between a Carbon Nanohorn with an NH3+ Moiety and C60 with a Crown Ether Moiety
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具有 NH3 部分的碳纳米角和具有冠醚部分的 C60 之间的超分子纳米杂化物中的光诱导电子转移
DOI：
10.1039/c3sc53342e
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
F.
中科院分区：
文献类型：
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作者：
Vizuete;M.; Gomez-Escalonilla;M. J.; Fierro;J. L. G.; Ohkubo;K.; Fukuzumi;S.; Yudasaka;M.; Iijima;S.; Nierengarten;J.-F.; Langa;F.
结合两种同素异形碳的纳米杂化物，即碳纳米角（CNH）和C60，是从带有苯并冠醚亚基（冠-C60）的C60衍生物和通过铵冠醚相互作用用NH3+基团功能化的CNH（CNH-sp-NH3+F−）获得的。由此产生的 CNH-C60 纳米杂化物已通过拉曼光谱和 XPS 光谱、热重分析 (TGA) 和高分辨率透射电子显微镜 (HR-TEM) 进行了表征。 CNH-C60 缀合物的光物理性质已在苯甲腈中进行了研究。飞秒激光闪光光解测量揭示了从C60部分的单重激发态到CNH的有效电子转移，速率常数为6.5×1010 s−1，产生自由基离子对，该自由基离子对通过电荷复合而衰变，寿命为1.0 ns，提供CNH-sp-NH3+F−和冠-C60的三重激发态。因此，两种碳纳米形态在 CNH-C60 缀合物中发挥互补作用，CNH 充当电子供体，C60 充当电子受体。
A nanohybrid combining two allotropic forms of carbon, namely carbon nanohorns (CNH) and C60, has been obtained from a C60 derivative bearing a benzocrown ether subunit (crown–C60) and a CNH functionalized with NH3+ groups (CNH-sp-NH3+F−) through ammonium–crown ether interactions. The resulting CNH–C60 nanohybrid has been characterized by Raman and XPS spectroscopies, thermogravimetric analysis (TGA) and high-resolution transmission electron microscopy (HR-TEM). The photophysical properties of the CNH–C60 conjugate have been investigated in benzonitrile. Femtosecond laser flash photolysis measurements revealed the occurrence of an efficient electron transfer from the singlet excited state of the C60 moiety to the CNH with a rate constant of 6.5 × 1010 s−1 to produce a radical ion pair, which decayed by charge recombination with a lifetime of 1.0 ns to afford the triplet excited state of CNH-sp-NH3+F− and crown–C60. The two carbon nanoforms play therefore complementary roles in the CNH–C60 conjugate, the CNH acting as an electron donor and C60 as an electron acceptor.