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KMID : 1059519850290060623
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Journal of the Korean Chemical Society
1985 Volume.29 No. 6 p.623 ~ p.628
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Kinetic Studies on the Reaction of Thiocyanate with Di-μ-oxobis-(aquaoxalatooxomolybdate (Ⅴ)) in Acid Media
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Kim Chang-Su
Kwon Chang-Yong
Yi Moon-Pyoung
Kim Chan-Woo
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Abstract
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Rate constants for complexing with thiocyanate after ring opening of molybdenum-oxalate in acid media were obtained spectrophotometrically at 460nm. The acid-assisted dissociation of molybdenum-oxalate and the reaction of thiocyanate with oxalatooxomolybdenum (Ⅴ) complex in acid media were investigated with thiocyanate and hydrogen ion concentration. The kinetic data indicate that molybdenum-oxalate is protonated to a limited extent in acid media and the protonated complex is responsible for an increase in rate for the reaction of thiocyanate with oxalatooxomolybdenum (Ⅴ) complex. Replacement of an oxalate ligand in acid media has been interpreted in terms of dissociative mechanism involving bond-breaking of the oxygen trans to the yl oxygen.
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