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All in the twist: Unusually large Stokes shifts and nonlinear optical properties are exhibited by furan-containing teraryl cyclophene derivatives (see picture). These cyclophenes have neither particularly strong electron-donating nor electron-withdrawing groups and have low polarity. DFT calculations have shown that the unusual photophysical properties are dictated by twisted π systems in the teraryl systems and the bridging double bond.
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Lin et al. (2006) studied this question.
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