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Abstract
A series of thienylene-ethynylene-tetrathiafulvalene oligomers 1–6 have been synthesized by the Sonogashira reaction of iodo-tetrathiafulvalene derivatives with thienylethynes. The X-ray structure of 4,5-bis(2-thienylethynyl)tetrathiafulvalene (1b) revealed a planar structure of the molecule. The electronic spectra of neutral oligomers 1–6 suggest a partial intramolecular charge transfer between the TTF and thienylethyne units. The cyclic voltammetric measurements of 1–4 showed multi-redox processes.
Acknowledgments
Dedicated to Professor Naomichi Furukawa on the occasion of his 70th birthday.The present affiliation for Masashi Hasegawa is Department of Chemistry, School of Science, Kitasato University, Kanagawa 228-8555, Japan.The authors are grateful to Dr. Y. Kuwatani (VSN, Inc.), Prof. H. Matsuyama (Muroran Institute of Technology), and Prof. M. Yoshida (Shimane University) for helpful discussions. This work was partly supported by a Grant-in-Aid for Science Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan.