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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 28, Number 5
BKCSDE 28(5)
May 20, 2007

Title	Dependence of Molecular Recognition for a Specific Cation on the Change of the Oxidation State of the Metal Catalyst Component in the Hydrogel Network
Author	Chitragara Basavaraja, Do Young Park, Young Min Choe, Hyun Tae Park, Yan Shuang Zhao, Tomohiko Yamaguchi, Do Sung Huh*
Keywords	Molecular recognition, Oxidation state, Oscillating-hydrogel, Chemical waves, BZ reaction
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.
Page	805 - 810
Full Text	PDF

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