A fast relaxation of electronically-excited inclusion complexes of a styryl dye with cucurbit[7]urilстатья
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Дата последнего поиска статьи во внешних источниках: 2 ноября 2014 г.
Аннотация:tThe relaxation of electronically-excited states of styryl dye (1) and its complexes with cucurbit[7]uril(CB[7]) in aqueous solution was studied by fluorescence steady-state and upconversion techniques. Thedecay of fluorescence, a 5-fold enhancement of which was observed upon addition of CB[7], was fitted tothree exponential functions with time constants of 274, 43 and 1.8 ps in the presence of CB[7], and 100,30, and 1.9 ps without it. In the framework of a simple model, based on the two-dimensional potentialenergy surface, the obtained results indicate that upon complexation the fluorescence rate constant ofdye 1 increases by 3.8 times.