Single-wall carbon nanotubes bearing covalently linked phthalocyanines -: photoinduced electron transfer
Single-wall carbon nanotubes bearing covalently linked phthalocyanines -: photoinduced electron transfer
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DOI：
10.1021/ja068240n
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发表时间：
2007-04-25
影响因子：
15
通讯作者：
Torres, Tomas
中科院分区：
文献类型：
--
作者：
Ballesteros, Beatriz;de la Torre, Gema;Torres, Tomas
HiPco单壁碳纳米管（SWNTs）的侧壁功能化与酞菁administers以下两种不同的方法：一个简单的普拉托反应与N-辛基甘氨酸和含甲酰基的酞菁，和逐步的方法，涉及前普拉托环加成到SWNTs的双键使用对甲酰基苯甲酸，然后酯化的衍生化的纳米管与适当的酞菁分子。通过这些途径获得的两种材料包含不同的碳/Pc-附加物比率，如通过拉曼、TGA和热物理研究所证明的。在瞬态吸收实验中观察到从光激发的酞菁到这些ZnPc-SWNT系综中的纳米管框架的电子转移的发生，这证实了单电子氧化的ZnPc阳离子的吸收和伴随的货车霍韦奇异性的典型从SWNT的漂白。电荷分离（即，2.0× 10（10）s（-1））和电荷复合（即，1.5 x 10（6）s（-1））动力学揭示了自由基离子对产物在二甲基甲酰胺中的显著稳定性。
HiPco single-walled carbon nanotubes (SWNTs) have been sidewall-functionalized with phthalocyanine addends following two different approaches: a straightforward Prato reaction with N-octylglycine and a formyl-containing phthalocyanine, and a stepwise approach that involves a former Prato cycloaddition to the double bonds of SWNTs using p-formyl benzoic acid followed by esterification of the derivatized nanotubes with an appropriate phthalocyanine molecule. The two materials obtained by these routes comprise different carbon/Pc-addenda ratios, as evidenced by Raman, TGA, and photophysical studies. The occurrence of electron transfer from photoexcited phthalocyanines to the nanotube framework in these ZnPc-SWNT ensembles is observed in transient absorption experiments, which confirm the absorption of the one-electron oxidized ZnPc cation and the concomitant bleaching of the van Hove singularities typical from SWNTs. Charge-separation (i.e., 2.0 x 10(10) s(-1)) and charge-recombination (i.e., 1.5 x 10(6) s(-1)) dynamics reveal a notable stabilization of the radical ion pair product in dimethylformamide.