ISSN:
0749-1581
Keywords:
EPR
;
ENDOR
;
Terthiophenes
;
Oligothiophenes
;
Radical cations
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Radical cations of a series of α-methyl-substituted bi-, ter- and quaterthiophenes were investigated by EPR and, in part, ENDOR spectroscopy. In the case of terthiophenes, the electronic and steric effects of methyl substituents were studied. The experimentally determined spin density distributions were rationalized by means of semi-empirical quantum-mechanical calculations (MNDO, PM3, RHF-INDO/SP). Sterically non-hindered oligothiophene radical cations are planar and form mixtures of cis and trans conformers, whereas uniform species were observed in the case of sterically hindered, non-planar radical cations.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/mrc.1260330112
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