Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 119, Issue 30, Pages 9905-9919Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.5b04931
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Funding
- SERB
- Department of Science and Technology (DST)
- Council of Scientific and Industrial Research (CSIR), Government of India
- IIT Kharagpur
- CSIR
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In this article), we have investigated the anomalous behavior of-two alcohol-water (tert-butyl alcohol (TBA)-water and ethanol-water) binary mixtures using femtosecond fluorescence upconversion, technique. Recently, Gupta and Patey (Gupta, R.; Paw G. N. J. Chem: Phys. 2012, 137, 034509(1)-034509(12)) have used four force fields to simulate TBA-water binary mixtures. Surprisingly, two of them do not identify any aggregation of TBA molecules. We have calculated average solvation time of Coumarin 480 (C480) using two different methods. Our results indicate slowdown in solvation time in the mole fraction ranges X-T = 0.09-0.15, X-T = 0.40-0.46 and X-E = 0.06-0.08, X-E = 0.20-0.25 for TBA-water and ethanol-water binary mixtures, respectively. Additionally, we have detected another anomalous region at X-T similar to 0.03. Slow solvation responses in the ranges X-T = 0.40-0.46 and X-E = 0.20-0.25 are probably due to the higher shear viscosity of the medium. However, X-T = 0.09-0.15 and X-E = 0.06-0.08 are the manifestation of aggregation induced structural transition of alcohol molecules. Hindered rotation of C480 in the ranges X-T = 0.04-0.09 and X-E = 0.03-0.07 corroborates our solvation dynamics results. From temperature dependent anisotropy measurements, we have shown that aggregation of alcohol molecules increases with increase in temperature.
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