Bulletin of the Korean Chemical Society

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Facile Evaluation of Thermodynamic Parameters for Reverse Thermochromism of Indolinobenzospiropyran-6-carboxylates in Aqueous Binary Solvents

  • Keum, Sam-Rok (Department of Advanced Material Chemistry, Korea University, Sejong Campus) ;
  • Ma, So-Young (Department of Advanced Material Chemistry, Korea University, Sejong Campus) ;
  • Lim, Hyun-Woo (Department of Advanced Material Chemistry, Korea University, Sejong Campus) ;
  • Han, Tae-Hwi (Department of Advanced Material Chemistry, Korea University, Sejong Campus) ;
  • Choi, Kyu-Hyun (Department of Advanced Material Chemistry, Korea University, Sejong Campus)
  • Received : 2012.03.07
  • Accepted : 2012.05.16
  • Published : 2012.08.20
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Abstract

The 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 and water-dimethyl sulfoxide. The existence of more than one type of interconvertible species of the ring-opened form of SP-COOH in aqueous binary solvents enables us to evaluate the molar extinction coefficients of the ring-opened species of SP-COOH and to obtain the thermodynamic parameters.

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