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|Title:||1-Naphthol as an ESPT fluorescent molecular probe for sensing thermotropic microenvironmental changes of pluronic F127 in aqueous media|
|Publisher:||Royal Society of Chemistry|
|Citation:||Physical Chemistry Chemical Physics, 17(26), 16752-16759|
|Abstract:||Thermotropic microenvironmental changes and the level of hydration in different microenvironments of pluronic F127 (PF127), (PEO<inf>106</inf> PPO<inf>70</inf> PEO<inf>106</inf>, average molar mass 13 000) in aqueous media have been studied using 1-naphthol, which is an ESPT fluorescent molecular probe. The appearance of 1-naphthol neutral form fluorescence in aqueous PF127 (10% w/v) solution indicates the ability of 1-naphthol to sense hydrophobic domains in micellar aggregations. There is a marked enhancement of the neutral form fluorescence at and above the gelation temperature (20�C), which shows that the probe can accurately sense the sol-gel transition. In the temperature range of 10-40�C, with increase in temperature there is a progressive enhancement of the neutral form fluorescence and the blue shift of the neutral and anionic form fluorescence|
a decrease in the deprotonation rate constant (k<inf>pt</inf>) indicates that the water-polymer interfacial region is progressively dehydrated. Because k<inf>pt</inf> is related to the availability of proton-accepting water in the microenvironment of 1-naphthol, the reduction of k<inf>pt</inf> indicates progressive dehydration. The thermotropic response of the I<inf>1</inf>/I<inf>3</inf> vibronic band ratio of pyrene-1-butyric acid fluorescence shows a progressive increase in the non-polarity of the interfacial domain with increasing temperature. The increase in non-polarity and the decrease of the hydration level are strongly correlated. This journal is � the Owner Societies.
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