Photoinduced Charge Separation in Reverse Micelles Prepared with Benzylhexadecyldimethylammonium Chloride (BHDC). The Electron-Transfer Reaction between Pyrene and N,N′-Dimethylaniline

Abstract

Laser flash photolysis was used to investigate the formation of radical ions produced in the quenching of the pyrene-N,N'-dimethylaniline exciplex by reverse micelles made with benzylhexadecyldimethylammonium chloride (BHDC) dispersed in benzene or chlorobenzene. The radical ion quantum yields, aion, were determined as a function of BHDC concentration and the amount of water dispersed. They were strongly dependent on the composition of the media. The charge separation was more effective in the BHDC-benzene than in the BHDC-chlorobenzene system. The results are discussed in terms of the properties of the micellar interface and the fast exchange of material produced by collisions between reverse micelles.

Hydrogen-bonding modulation of excited-state properties of flavins in a model of aqueous confined environment

“…As already observed for several molecules and molecular complexes, 33,41,42 all the above results indicate the effect of specific interactions of the flavins in the internal micellar interface, which depends on the increment of the size and fluidity of the RM governed by the hydration degree of the micellar interface. This assumption is supported by the time-resolved fluorescence experiments presented in the following section.…”