A Thermodynamic Study on Thermochromism of Blue Dye Systems

Journal of the Korean Chemical Society

Jae Uk Kim¹  Byung Kwan Cha¹  Jong Gyu Kim¹  Myoung Jin Ji¹ 

关键词: Thermochromism;    Functional Dye;    Equilibrium constant;    Enthalpy;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Two different dyes containing the same molecular weight but different chemical structure have been utilized for the study of thermodynamic parameters. In this study, {3-(4-(diethylamino)phenyl)-3-(1-ethyl-2-methyl-1H-indol-3-yl)isobenzofuran- 1(3H)-one} (Blue 502) and {3-(4-(diethylamino)-2-methylphenyl)-3-(1,2-dimethyl- 1H-indol-3-yl)isobenzofuran-1(3H)-one} (Blue 402) were used. It has been performed by measuring UV spectra of the two dyes. In general, the blue shift has been observed from both dyes in higher carbon number alcohol solvents. Interestingly, Blue 502 showed higher stability than Blue 402 in the same conditions used in this study. And, the equilibrium constants (0.9 ~ 1.0) of the dyes depending upon temperature change were also calculated using UV absorbance. The standard enthalpy calculated from equilibrium constants and molar absorptivity(¥å) are 10.94 kJ/mol in Blue 402 and 9.010 kJ/mol in Blue 502, respectively.

【 授权许可】

Unknown