Responsive surfaces pyrene

Figure 8. Response surface for resolution, R of fluoranthene and pyrene (----) is the isopleth for k (fluoranthene)...

Figure 9. Response surface for resolution of benz(a)anthracene and pyrene ...

The influence of the nonuniform character of the interior of zeolites on the photophysics of adsorbed guest molecules has been observed. Pyrene molecules included in zeolite faujasites show both monomer and excimer emission [232,233]. As in the case of silica surfaces, the excitation spectra of the emission corresponding to the monomer and the excimer differ (Figure 36), suggesting that there are at least two independent sites, each responsible for monomer emission and excimer emission. Time-resolved emission studies of pyrene included in Na + -X and Na + -Y (<0.1 molecule per cage) indicate... 

Properties of a solute may differ gready between a free solution and that confined in pores of a sol-gel glass. Pyrene fluorescence was used to study the solute-silica interactions (Badjic, 2000). The entry of various aromatic compounds was examined from solution into the monolith of sol-gel sihca immersed in this solution. The solute-sihca interactions responsible for the extraction are not of die van der Waals type, but hydrogen bonding between the aromatic n system in the solutes and the hydroxyl groups on the sihca surface. 

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