Abstract
A new N-ammoniopropyl styryl dye and 18-crown-6 ether styryl dye of the pyridine series form a head-to-tail pseudodimeric complex through host-guest hydrogen bonding; the complex undergoes stereospecific [2 + 2]-photocycloaddition due to the stacking-induced pre-organization of the ethylene bonds of dye chromophores.
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