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Preparation and characterization of 3-(4,5-ethylenedithio-1,3-dithiol-2-ylidene)naphthopyranone: a luminescent redox-active donor–acceptor compound

Dolder, Stefan ; Liu, Shi-Xia ; Guégano, Xavier ; Atanasov, Mihail ; Daul, Claude A. ; Leiggener, Claudia ; Hauser, Andreas ; Neels, Antonia ; Decurtins, Silvio

In: Tetrahedron, 2006, vol. 62, no. 48, p. 11106-11111

A new 1,3-dithiol-2-ylidene substituted naphthopyranone 2 has been synthesized and characterized. UV–vis spectroscopic and cyclic voltammetry results, interpreted on the basis of density functional theory, show that 2 displays an intramolecular charge-transfer transition and acts like a donor–acceptor (D–A) system. Furthermore, a weak fluorescence originating from the excited...