Abstract
Pyrene/β-cyclodextrin solid complexes (prepared using β-cyclodextrin, hydroxypropyl-β-cyclodextrin, and 2,3,6-triacetyl-β-cyclodextrin as hosts) were characterized by means of fluorescence spectroscopy and time-resolved diffuse reflectance laser flash photolysis. The relative intensity of the 0–0 and 0–2 vibronic bands in the emission spectrum of pyrene is found to increase as substitution of the cyclodextrin hydroxyl groups increases. Furthermore, a concomitant shortening in pyrene triplet lifetime results. Interestingly, a significant decrease in pyrene radical anion yield and lifetime is observed with 2,3,6-triacetyl-β-cyclodextrin as host; this effect is ascribed to the potential ability of the host matrix to trap electrons.
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