International Journal of Scientific & Technology Research

IJSTR@Facebook IJSTR@Twitter IJSTR@Linkedin
Home About Us Scope Editorial Board Blog/Latest News Contact Us

IJSTR >> Volume 3- Issue 7, July 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Kinetic Approach To The Mechanism Of P-Bis(Dimethylamino)-Phenothiazin-5-Ium Chloride Sulphate Ion In Acidic Medium

[Full Text]



Babatunde OA, Umoru, Patricia Ese



Key words: kinetics, reaction mechanism, stoichiometry, sulphate ion and methylene blue.



ABSTRACT: The kinetics and mechanism of p-Bis(dimethylamino)-phenothiazin-5-ium chloride by sulphate ion has been investigated in perchloric acid. The progress of the reactions was monitored by observing the decrease in absorbance of the oxidant at λ max of 663 nm UV/Vis Spectrumlab 752s spectrophotometer. The results showed a stoichiometry of 1:2, first-order dependence in both oxidant and reductant. The second order rate equation at constant temperature is therefore given as: -d[MB]/dt= k2[MB][SO42-] where k2 = 4.86 dm3 mol-1 min-1 A positive primary salt effect was observed and an increase in the concentration of hydrogen ion as well dielectric constant increased the rate of reaction. Added ions did not show any effect on the rate of reaction. The result of spectroscopic and kinetic investigation did not indicate intermediate complex formation in the course of the reaction. A plausible mechanism for the reaction has been proposed in line with the outer-sphere reaction pathway.



[1]. Greenwood S, Noman N, Earnshaw A (1997) Chemistry of the Elements (2nd ed.). Butterworth-Heinemann

[2]. Bosoy S, Dimitry A (2008) Utilization of methylene blue in the setting of hypotension associated with concurrent renal and hepatic failure: a concise review. OPUS 12 Scientist.2, 219

[3]. Preiser Jean-Charles, Lejeune (1995) Methylene blue administration in septic shock: A Clinical Trial. Critical Care Medicine. 23:25964

[4]. Babatunde OA, Faruruwa MD, Umoru P E (2013). Mechanism of the Reduction of 3,7-bis (dimethylamino) phenazothionium chloride by Metabisulphite Ion in Acidic Medium. Der Chemica Sinica, 4(3):69-787

[5]. Jonnalagadda, SB, Chinake CR, Simoyi RH (1996). J.Phys. Chem.100:13521-15530

[6]. Iyun JF, Asala M (1994) Mechanism of bromate oxidation of 3,7-bis (dimethylamino) phenazothionium chloride. A paper presented at the 18th annual conference of the chemical society of Nigeria, Kano. 29th May 2nd June

[7]. Bugaje BM (2006) Kinetics And Mechanisms Of Redox Reactions Of Methylene Blue And Ethylenediamine Tetracetatocobaltate (II) with some oxy-anions in aqueous solution. M.Sc. Thesis. Chemistry Department, Ahmadu Bello University, Zaria

[8]. Ukoha PO (2005) Kinetics and mechanisms of the reduction of 3,7-bis(dimethylamino) phenazothionium chloride by β-mercaptoethanolin acid media. J. Chem. Soc. Nig. 30(2):165-170

[9]. Snehalatha T, Rajana KC, Saiprakash PK (1997) J. Chem. Edu., 74(2): 228-233

[10]. Osunlaja AA, Idris SO, Iyun JF (2012a). Mechanism of the Reduction of Methylene Blue by Thiourea in Aqueous Acidic MediumInternational Journal of ChemTech Research , 4(2): 609-617

[11]. Penngnton DE, Halm A (1967) Kinetics and mechanism of chromium (II) Catalyzed substitution of iodine iron in iodo penta, aqua chromium (III) Iron by water, fluoride, chloride, and Bromate iron. Inorganic chemistry, 6:2132

[12]. Przystas TT, Sutin N (1973) Kinetics Studies of Anion Assisted outer-sphere Electron Transfer Reactions. J. Amer. chem soc. 95: 5545

[13]. Adegite A, Iyun JF, Ojo JF (1997) Kinetics and mechanism of Electron Transfer Reactions Between Uranium (III) and some Ruthanium (III) Amine complexes. J. Chem. Soc. Dalton 115

[14]. Iyun JE, Lawal HM, Olagbemiro TO (1995) Kinetics and mechanism of oxidation of 1,4-benzenediol by Trioxalatocobaltate III ion inaqueous acid medium. Indian J. Chem., 34(A): 446-447

[15]. Bexendde JH, Hardy HR (1954) Kinetics and equilibria in solution containing ferrous ions, ferric ions and some substituted hydroquinone and quinines. Trans Faraday Soc., 50: 808

[16]. Osunlaja AA, Idris SO, Iyun, JF (2012) Kinetic analysis of the oxidation of 1-methyl-2-thiourea by methylene blue inacid medium. Der Chemica Sinica, 3(6):1428-1437

[17]. Osunlaja AA, Idris SO, Iyun JF (2012b) Kinetics and mechanism of the methylene blue-permanganate ion reaction inacidic medium International Journal of ChemTech Research, 4(2): 772-780

[18]. Mohammed Y, Iyun JF, Idris, SO (2009) Afri. J. Pure and Appl. Chem., 3(12): 269-274

[19]. Bamford CH, Tipper CPH (1967) Comprehensive Chemical Kinetics, Elsevier N.Y, 278