Solvation dynamics study of 4-amino-N-methyl-phthalimide in n-alcohol solutions

Abstract

We have studied the solvation dynamics of 4-amino-N-methyl-phthalimide ͑4-ANMP͒ in n-butanol and n-decanol solutions. Solvation time correlation functions were evaluated from wavelength-dependent fluorescence lifetime distributions at two temperatures for the two solvents. Solvation dynamics of 4-ANMP was strongly temperature dependent in n-butanol, which is a more polar and less viscous solvent than n-decanol. A smaller effect was observed in n-decanol solution. We also measured the rotational correlation times of 4-ANMP in the same solutions and resolved two components indicative of a nonspherical structure of the molecule. The solvation times with relation to the dielectric relaxation times L and D for linear alcohols are discussed.

Cosurfactant Impact on Probe Molecule in Reverse Micelles

“…Indeed, longitudinal relaxation times from dielectric relaxation studies suggest that the solvation dynamics observed in 1-heptanol should have a characteristic relaxation time of ∼150 ps. 30,[51][52][53] Previous reports in the literature show that alcohol molecules added to solutions containing reverse micelles associate with the self-assembled structures rather than existing dispersed or as aggregates in the supporting nonpolar solvent, especially in systems such as the ones presented here where the overall concentration of alcohol in the reverse micellar solutions is quite low compared to other components, particularly the surfactant. In addition, the steady-state fluorescence spectrum of C343 in a mixture of heptanol dissolved in alkane solvent possesses a distinctly different shape from the steady-state spectra measured in samples containing reverse micelles, as shown in Figure 2.…”

Temperature effect on 4-aminophtalimide fluorescence in n-alcohols

“…As noticed in the introduction such behavior of p exp ν is expected. It is the consequence of the growing retardation of the solvation process, that follows a decrease in temperature [15,16,31]. Because of this retardation, 4-AP fluorescence spectrum does not shift as quickly to red, upon solvation of the solute through interactions with the surrounding solvent, as at high temperatures.…”

Solvation dynamics study of 3-aminophthalimide in n-butanol solution at different temperatures

“…Several experimental, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]32 theoretical, [18][19][20][21][22][23][24] and molecular dynamics simulation studies 1,20,23,[25][26][27][28][29] have been published. Although many excellent theoretical treatments have been developed by researchers in the complicated field of solvation dynamics, there are still many problems to be solved.…”

“…4 Ultrafast fluorescence spectroscopy on fluorescent molecules in solution is most often used to probe the mechanisms and dynamics of the polar solvation. 6,7,10,11,30 Solvation effects in chemical processes such as proton or electron transfer have been studied. Electronic excitation leads the solute into a nonequilibrium solvation state.…”

“…The other important dyes tested in solvation dynamic studies are DMABN, 7,14 DEABN, 14 DMAPS, 14 TNSDMA, 31 LDS-750, 32 Prodan, 16 bianthryl, 11 1-aminonaphthalene, 1 and phenothiazine. 5 Most solvation dynamics studies have been done in solvents such as alcohols, 1,3,6,7,9,10,12,[14][15][16][17]32 nitriles, 3,4,[9][10][11]13,32 propylene carbonate, 3,[8][9][10][11]32 dimethylsulfoxide ͑DMSO͒, 1,3,9,11,32 acetates, 8,10,30 amides, 3,9,32 and acetone. 3,9 Solvents used rarely are glycols, 15 glycerol, 15 triglyme, 11 nitrobenzene, 32 tetrahydrofuran, 3 butylcloride, 7 toluene, 15 , water, 9 and micelles.…”