Preparation and photochemistry of single wall carbon nanotubes having covalently anchored viologen units

被引:31
作者
Alvaro, M
Aprile, C
Atienzar, P
Garcia, H [1 ]
机构
[1] Univ Politecn Valencia, CSIC, Inst Tecnol Quim, Valencia 46022, Spain
[2] Univ Politecn Valencia, Dept Quim, Valencia 46022, Spain
关键词
D O I
10.1021/jp044273i
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
An asymmetrically substituted viologen (V) has been covalently anchored to single wall carbon nanotube (SWNT) through an ester linkage by reacting chlorinated purified SWNT with N-methyl-N-(6-hydroxyhexyl)4,4'-bipyridine. Spectroscopic evidence for the covalent bond of viologen in V-SWNT comes from the chemical shift of the -CH2-O-CO- methylene group in H-1 NMR and from the variations of the 1590 and 1380 cm(-1) bands in the Raman spectrum of the V-SWNT with respect to SWNT. The fact that the estimated quenching constant of the SWNT emission by viologen is about 2 orders of magnitude higher than the diffusion coefficient indicates the occurrence of a static quenching arising from the formation of a nonemissive viologen-SWNT complex. Laser flash photolysis shows the formation of viologen radical cation upon direct excitation of V-SWNT. The viologen moiety of V-SWNT is able to form a charge-transfer complex with 2,6-dimethoxynaphthalene (DMN) as evidenced by optical spectroscopy and, upon selective photoexcitation in the charge-transfer band, this V-DMN complex anchored to SWNT gives rise to the corresponding charge separated state decaying in the submillisecond time scales.
引用
收藏
页码:7692 / 7697
页数:6
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