Abstract
E-mail: keum@korea.ac.kr Received March 7, 2012, Accepted May 16, 2012The position of the thermodynamic equilibrium for reverse thermochromic spiropyran 6-carboxylates (SP-COOHs) was easily determined in aqueous binary mixtures, such as water-methanol, water-acetonitrile andwater-dimethyl sulfoxide. The existence of more than one type of interconvertible species of the ring-openedform of SP-COOH in aqueous binary solvents enables us to evaluate the molar extinction coefficients of thering-opened species of SP-COOH and to obtain the thermodynamic parameters. Key Words : Reverse thermochromism, Aqueous binary solvent mixtures, Prototropic equilibrium, E
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