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■ The Radical Ions of Tetraphenylthieno[3,4-c]thiophene

Peter Fürderer, Fabian Gerson,* Michael P. Cava, and M. V. Lakshmikantham

*Physikalisch-Chemisches Institut der Universität Basel, Kingelbergstrasse 80,4056 Basel, Switzerland

Abstract

The radical anion and the radical cation of 1,3,4,6-tetraphenylthieno[3,4-c]thiophene have been studied by ESR and ENDO spectroscopy. The coupling constants, ^aH_p ^aH_o»^aH_m, of the phenyl protons in the para-, ortho- and meta-positions, respectively, suggest an angle θ<40° of twist about the bonds linking the phenyl substituents with the thieno[3,4-c]thiophene moiety.