期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 2, 期 3, 页码 211-215出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/S1388-2481(00)00007-2
关键词
cation radicals; oligomerization; dimerization; substituted thiophenes; 2,5 ''-dihexylterthiophenes
The reversible dimerization of cation radicals of a series of end-capped 2,5-dihexylterthiophenes with the median thiophene ring either unsubstituted (1) or mono- and di-substituted by methyl and hexyl groups (2-5) has been investigated. Concentration-dependent cyclic voltammetry UV-Vis-NIR spectroelectrochemistry and temperature-dependent ESR spectroscopy lead to consistent results showing that, whereas the cation radical of compound 1 already dimerizes at room temperature, substitution of the median thiophene ring leads to a dramatic decrease in the propensity of the corresponding cation radical to dimerize. These results provide conclusive evidence for a steric control of the reversible dimerization of short-chain oligothiophene cation radicals. (C) 2000 Elsevier Science S.A. All rights reserved.
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