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Title: Synergetic influence of mercaptoacetic acid on the reaction of thiourea with methylene blue in acidic medium
Authors: Mishra, K K
Dwivedi, Upasana
Keywords: Kinetics;Reaction Mechanism;Synergetic Effect;Mercaptoacetic Acid;Thiourea-Methylene Blue Reaction
Issue Date: 2-Mar-2012
Abstract: Thiourea and methylene blue interact in a mole ratio of 2:1 in the presence of HCl forming the corresponding disulphide and leucomethylene blue. The order in thiourea is unity while that in methylene blue is zero at higher concentrations (ca.>2.5×10-5 M). At lower concentrations, the order in methylene blue is -1/2; this kinetic deviation depends on the nature of the thiol acid exhibiting synergetic effect. Mercaptoacetic acid does not react with methylene blue under the prevailing conditions; however it exerts a synergetic effect on the reaction. The rate increases linearly on increasing [H+] with the reaction having a large negative entropy of activation. Electrospray induced mass spectrometry, 1H NMR and FTIR data indicate the participation of a persulphide-like species formed due to thiourea–mercaptoacetic acid interaction, which is perhaps responsible for the synergetic effect of mercaptoacetic acid.
Page(s): 458-463
Appears in Collections:IJC-A Vol.51A(03) [March 2012]

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