Ballesteros, Beatriz and de la Torre, Gema and Ehli, Christian and Rahman, G. M. Aminur and Agullo-Rueda, F and Guldi, Dirk M. and Torres, Tomas (2007) Single-wall carbon nanotubes bearing covalently linked phthalocyanines - photoinduced electron transfer. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 129 (16). pp. 5061-5068.
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Official URL: http://dx.doi.org/10.1021/ja068240n
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.
|Subjects:||Physical Science > Nano objects|
Material Science > Nanostructured materials
Material Science > Nanochemistry
|Deposited By:||Anuj Seth|
|Deposited On:||13 Jan 2009 13:50|
|Last Modified:||12 Feb 2009 12:14|
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