Tetrahedron p. 10169 - 10178 (1997)
Update date:2022-08-03
Topics:
Yamashita, Yoshiro
Ono, Katsuhiko
Tomura, Masaaki
Tanaka, Shoji
Benzo[1,2-c:4,5-c']bis([1,2,5]thiadiazole) containing a hypervalent sulfur atom has a low LUMO energy. The aryl derivatives were synthesized using a Stille coupling reaction. The selenadiazole analogues were also prepared. The electron accepting properties of these nonclassical heterocycles were shown by their high reduction potentials. Introduction of electron-donating groups into the electron-withdrawing heterocycles afforded novel donor-acceptor compounds. Their cyclic vollammograms showed that they are easily both oxidized and reduced. Some of them have the absorption maxima above 700 nm due to the small HOMO-LUMO separation. X-ray structure analysis of the diphenyl derivative revealed the formation of a tape-like network through short S···N contacts.
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