Kinetics of oxidation of thiocyanate ion by manganese(III) in pyrophosphate medium |
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Authors: | Ishwar K Bhat Bailure S Sherigara Ivan Pinto |
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Institution: | (1) NGSM Institute of Pharmaceutical Science, 574 160 Derlakatte, India;(2) Department of Postgraduate Studies and Research in Chemistry, Mangalore University, 574 199 Mangalagangothri, India;(3) St Aloysius College, 575 003 Mangalore, India |
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Abstract: | Summary MnIII is stabilized by pyrophosphate in weakly acidic solutions. The nature of the complex formed was elucidated spectrophotometrically. The kinetics of MnIII oxidation of thiocyanate in pyrophosphate medium was investigated over the pH range 2–3. The oxidation followed first order kinetics with MnIII]. The effects of varying MnIII], NCS–], added MnII and metal ions, pH, total P2O
f7
p4–
] and added ClO
f4
p–
, Cl– and SO
f4
p2–
were studied. The order in NCS–] was unity, and increasing H+] increased the rate. Retardations with added P2O
f7
p4–
and MnII were observed. Complexation of NCS– as K2Zn(NCS)4 decreased the reactivity without any change in overall mechanism. The dependence of the reaction rate on temperature was examined, and activation parameters were computed from Arrhenius and Eyring plots. A mechanism consistent with the results is proposed. |
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Keywords: | |
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