The title donor–π–acceptor compounds were prepared by the reaction of acetylenes containing a 1,3-dithiol-2-ylidene unit with tetracyanoethylene (TCNE). They showed amphoteric properties and intramolecular charge-transfer absorptions in the visible region. The molecular and crystal structures were revealed by X-ray analysis.
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Morioka et al. (2004) studied this question.
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