Abstract
Inclusion crystals of 7-bromo-1,4,8-triphenyl-2,3-benzo[3.3.0]octa-2,4,7-trien-6-one (1a) and its chloro-derivative (1b) showed a reversible colour change from yellow to green on exposure to UV-light, and this depends on the guest molecules present. The crystal structures of the inclusion complex were determined by X-ray analysis.
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