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A Thermodynamic Study on Phthalide‐Type dyes in Aqueous Alcohol Solutions
Author(s) -
Kim JaeUk,
Yoo JeongYeol,
Kim JongGyu
Publication year - 2015
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.10381
Subject(s) - phthalide , chemistry , aqueous solution , enthalpy , alcohol , absorbance , gibbs free energy , equilibrium constant , absorption spectroscopy , absorption (acoustics) , spectroscopy , organic chemistry , chromatography , thermodynamics , materials science , physics , quantum mechanics , composite material
Phthalide‐type dyes in aqueous variable alcohol solution were studied by UV –vis absorption spectroscopy. In this study, 7‐[4‐(diethylamino)‐2‐ethoxyphenyl]‐7‐(1‐ethyl‐2‐methyl‐ 1H ‐indol‐3‐yl)furo[3,4‐b]pyridin‐5( 7H )‐one (“Blue‐63”) was used. Generally, a blue shift is observed from dyes in higher‐carbon‐number‐alcohol solvents. The results indicated the dye equilibrium constant in aqueous alcohol solutions. The equilibrium constant ( K ), Gibbs energy change ( ∆G ), enthalpy change ( ∆H ), and entropy change ( ∆S ) of the dye, depending on temperature change, were also calculated using UV absorbance.
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