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The Radical Cations and the Radical Anions of Some Weitz ‐Type S‐Donors
Author(s) -
Gerson Fabian,
Gescheidt Georg,
Knöbel Jürgen,
Murata Ichiro,
Nakasuji Kazuhiro
Publication year - 1987
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19870700812
Subject(s) - chemistry , hyperfine structure , hyperfine coupling , ion , radical ion , electron paramagnetic resonance , radical , ground state , photochemistry , crystallography , nuclear magnetic resonance , atomic physics , organic chemistry , physics
The radical cations and the radical anions of 1,6‐dithiapyrene ( 1 ) and 3,10‐dithiaperylene ( 2 ) as well as those of three further Weitz ‐type S‐donors 3 , 4 , and 5 have been studied by ESR spectroscopy. The experimental findings for \documentclass{article}\pagestyle{empty}\begin{document}$ 1^{\scriptstyle {{\relbar}\kern-4pt {.} }} $\end{document} (widths and behaviour on saturation of hyperfine lines) suggest that the ground state of this radical anion is effectively degenerate. With the exception of \documentclass{article}\pagestyle{empty}\begin{document}$ 1^{\scriptstyle {{\relbar}\kern-4pt {.} }} $\end{document} , the ESR studies of all radical ions could be complemented by the use of the ENDOR and general TRIPLE resonance techniques. In addition to proton hyperfine data, 33 S coupling constants have been determined for \documentclass{article}\pagestyle{empty}\begin{document}$ 1^{+ \atop \dot{}} $\end{document} (0.53mT), \documentclass{article}\pagestyle{empty}\begin{document}$ 2^{+ \atop \dot{}} $\end{document} (0.46mT), and \documentclass{article}\pagestyle{empty}\begin{document}$ 4^{+ \atop \dot{}} $\end{document} (0.34mT); they are in agreement with the predicted substantial π‐spin populations at the S‐atoms.