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KMID : 0369819900200030145
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Jorunal of Korean Pharmaceutical Sciences
1990 Volume.20 No. 3 p.145 ~ p.152
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Studies on the Zr - Pyrithione Complex
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권중무/Kwon CM
이계주/Rhee GJ
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Abstract
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Zirconium pyrithione complex was prepared by reaction of sodium-pyrithione solution and zirconyl chloride solution. The physico-chemical properties of the complex was examined by means of IR, XRD, DSC and NMR. And the stability of Zr-complex was investigated on the basis of accelerated stability analysis under conditions of temp. elevation, UV radiation and pH dependence. The result indicates that the ratio of the ligand to metal in Zr-pyrithione complex was determined 4:1, and its stability constant was 4.643×104. The rate order of decomposition of the complex was apparent first-order reaction of which rate constant and the decomposition rate was not only accelerated by effect of heat and UV radiation but was catalyzed by specific acid-base catalysis considered the pH dependence for the hydrolysis of the complex and the suspension was most stable over the range pH 4-8 indicating that solvent catalysis is the primary made of reaction in this region.
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KEYWORD
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pyrithione, complexation, Zr-pyrithione, stability, IR, XRD, DSC, NMR
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