Intramolecular charge transfer processes and solvation dynamics of coumarin 490 in reverse micelles

Simulations of time-dependent fluorescence in nano-confined solvents

“…6 ͑Their time resolution is ϳ80 ps.͒ Sarkar and co-workers have investigated the solvation dynamics of Coumarin 490 in aqueous reverse micelles and Coumarin 152A in acetonitrile and methanol reverse micelles. 22 In all cases they find biexponential decay of S(t) with the fast decay ϳ0.5-1.7 ns and the long-time decay 7.6 -15.5 ns. In the aqueous reverse micelles the longest decay time was essentially independent of the water pool size and the shorter time constant was smaller for the larger solvent pool.…”

Exploring membrane organization and dynamics by the wavelength-selective fluorescence approach

“…3). These are bound water, trapped water, and free water (Jain et al, 1989;Ikushima et al, 1997;Hazra and Sarkar, 2001). The crucial parameter w o determines the relative proportions of these three types of water pools.…”

Vibrational energy relaxation of aqueous azide ion confined in reverse micelles

“…6,7 RMs have received considerable attention lately, in part because of their application in size-selective nanoparticle synthesis ͑due to -control of water pool radii͒, in studying confinement and interfacial effects on liquids and solvated species, and in investigations based on the biomimetic nature of RMs aimed at modeling biological systems, such as membranes. 1,4,5 Previous studies of RMs [1][2][3][4][5][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] indicate that water encapsulated in RMs is restricted or bound near the interface, which results in reduced hydrogen bonding and a lower polarity and dielectric constant compared to bulk water. Studies have shown the intuitively appealing result that as the size of the water pool increases by increasing , the molecular behavior tends toward bulk water.…”