Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Dependence of Molecular Recognition for a Specific Cation on the Change of the Oxidation State of the Metal Catalyst Component in the Hydrogel Network

  • Basavaraja, Chitragara (Department of Chemistry and Institute of Functional Material, Inje University) ;
  • Park, Do-Young (Department of Chemistry and Institute of Functional Material, Inje University) ;
  • Choe, Young-Min (Department of Chemistry and Institute of Functional Material, Inje University) ;
  • Park, Hyun-Tae (Department of Chemistry and Institute of Functional Material, Inje University) ;
  • Zhao, Yan Shuang (Department of Chemistry and Institute of Functional Material, Inje University) ;
  • Yamaguchi, Tomohiko (National Institute of Advanced Industrial Science and Technology) ;
  • Huh, Do-Sung (Department of Chemistry and Institute of Functional Material, Inje University)
  • Published : 2007.05.20
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Abstract

Molecular recognition for a specific cation depending on the change of the oxidation state of the metal catalyst component contained in the hydrogel network has been studied in a self-oscillating hydrogel. The selfoscillating hydrogels are synthesized by the copolymerization of N-isopropylacrylamide (NIPAAm), lead methacrylic acid (Pb(MAA)2), and Ru(bpy)3 2+ monomer as a metal catalyst component. The recognition for a specific cation (in this study, Ca2+ has been used) is characterized by the adsorbed amount of Ca2+ into the gel. The recognition of the gels for Ca2+ is higher at the temperature below the LCST, and also higher at the oxidized state than at reduced state of the metal catalyst component which corresponds to a more swollen state. Moreover, a propagating wave induced by a periodic change of the oxidation state with the diffusion phenomena in the oscillating hydrogel shows a possibility for temporal and site-specific molecular recognition due to the local swelling of the gel.

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