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

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Abstract
We have studied the solvation dynamics of 4‐amino‐N‐methyl‐phthalimide (4‐ANMP) 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 τL and τD for linear alcohols are discussed.