The functional photoswitchable systems 1–3 and 12–15 display pronounced photochromic properties; the bis-pyridinium derivative 1 represents a prototype of a switched molecular wire which may be converted from an open unconjugated form to a closed electron-conducting state.
S. L. Gilat, S. H. Kawai and J. Lehn, J. Chem. Soc., Chem. Commun., 1993, 1439 DOI: 10.1039/C39930001439
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