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Title: Cu(II)-catalysed oxidation of bioactive substrates by methylene blue in acidic medium assisted by Zn(II): Possible role of nanoparticles
Authors: Mishra, K K
Gupta, Ritu
Shukla, Maya
Chaturvedi, Ranu
Pal, Mahender
Sharma, Ranjana
Keywords: Kinetics;Reaction mechanism;Nanoparticles;Synergism;Catalysis;Copper;Zinc;Metal ion catalysis;Methylene blue
Issue Date: 5-Jun-2013
Abstract: The bioactive sulphydryl substrates, cysteine hydrochloride (cys) and 2-mercaptoethylamine hydrochloride (2-ME) react with methylene blue in acidic medium in presence of Cu(II) as a catalyst. While Zn(II) has no catalytic role on its own, when it is added along with Cu(II) to the reaction system, the corresponding rate constants increase by about 25%. TEM images of the representative cys-Cu-MB system reveal the formation of the nanorods, while on adding Zn(II) to the reaction system, the morphology of the nanoparticles changes from nanorods to nanogranules. These findings are also substantiated by electron diffraction studies. It thus appears that the morphology of nanoparticles and the possible synergetic effect of Zn(II) are correlated. The synergetic effect of Zn(II) is also favoured by the presence of amino group in the substrate molecule while carboxylic group hinders it.
Page(s): 724-731
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.52A(06) [June 2013]

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