Reduction of Toluidine Blue by Sulfur(IV) in Acetate Buffer Medium: Kinetics and Mechanism

Pratik K. Sen; Rabindra N. Bera; Biswajit Pal

doi:10.14233/ajchem.2015.18285

Issue

Vol. 27 No. 4 (2015): Vol 27 Issue 4

Issue Published : February 4, 2015

This work is licensed under a Creative Commons Attribution 4.0 International License.

Reduction of Toluidine Blue by Sulfur(IV) in Acetate Buffer Medium: Kinetics and Mechanism

https://doi.org/10.14233/ajchem.2015.18285

Pratik K. Sen

Department of Chemistry, Jadavpur University, Kolkata-700 032, India

Rabindra N. Bera

Department of Chemistry, Jadavpur University, Kolkata-700 032, India

Biswajit Pal

Department of Chemistry, St. Paul's C.M. College, 33/1 Raja Rammohan Roy Sarani, Kolkata-700 009, India

Corresponding Author(s) : Pratik K. Sen

senpk@yahoo.com

Asian Journal of Chemistry, Vol. 27 No. 4 (2015): Vol 27 Issue 4
Article Published : February 4, 2015

Abstract

The reduction of toluidine blue (TB⁺) by sulfite [S(IV)] was studied spectrophtometrically in acetic acid-sodium acetate buffer medium in the temperature range 293-308 K. The reaction showed first order dependence on toluidine blue. The reaction was found to be first order in S(IV) at lower substrate concentration ([S(IV)] £ 0.07 mol dm^-3) but the reaction became second order in S(IV) at high substrate concentration ([S(IV)] > 0.07 mol dm^-3). H⁺ ions were found to inhibit the reaction in the pH range 4.0-5.4. The rate decreased with increase in the ionic strength of the medium, but remained unchanged with decreasing dielectric constant of the medium. The oxidation reaction possibly involved a one-electron transfer step via a free radical mechanism. An overall enthalpy and entropy of activation were computed. A plausible mechanism and rate law corroborating the experimental results have been put forward.

Keywords

Reduction Sulfur(IV) Toluidine blue Kinetics and mechanism

K. Sen, P., N. Bera, R., & Pal, B. (2015). Reduction of Toluidine Blue by Sulfur(IV) in Acetate Buffer Medium: Kinetics and Mechanism. Asian Journal of Chemistry, 27(4), 1439–1443. https://doi.org/10.14233/ajchem.2015.18285

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References

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O. Baud, V. Laudenbach, P. Evrard and P. Gressens, Pediatr. Res., 50, 706 (2001); doi:10.1203/00006450-200112000-00013.

2 A.K. Horváth and I. Nagypál, J. Phys. Chem. A, 110, 4753 (2006); doi:10.1021/jp060246b.

J.F. Read, J. John, J. MacPherson, C. Schaubel and A. Theriault, Inorg. Chim. Acta, 315, 96 (2001); doi:10.1016/S0020-1693(01)00331-0.

G.P. Haight Jr., E. Perchonock, E. Emmenegger and G. Gordon, J. Am. Chem. Soc., 87, 3835 (1965); doi:10.1021/ja01095a009.

U. Chandrawat, A. Prakash and R.N. Mehrotra, Can. J. Chem., 73, 1531 (1995); doi:10.1139/v95-190.

T. Ernst, M. Cyfert and M. Wilgocki, Int. J. Chem. Kinet., 24, 903 (1992); doi:10.1002/kin.550241008.

K.K. Sen Gupta, S. Das and S.S. Gupta, Transition Metal Chem., 13, 261 (1988); doi:10.1007/BF01025669.

K.K.S. Gupta, S. Das and S.S. Gupta, Transition Metal Chem., 12, 417 (1987); doi:10.1007/BF01171652.

K.K. Sen Gupta, S. Das and P.K. Sen, Transition Metal Chem., 12, 33 (1987); doi:10.1007/BF01023126.

J.B. Epstein, C. Scully and J. Spinelli, J. Oral Pathol. Med., 21, 160 (1992); doi:10.1111/j.1600-0714.1992.tb00094.x.

J.B. Epstein, C. Oakley, A. Millner, S. Emerton, E. van der Meij and N. Le, Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod., 83, 537 (1997); doi:10.1016/S1079-2104(97)90117-7.

G. Sridharan and A.A. Shankar, J. Oral Maxillofac. Pathol., 16, 251 (2012); doi:10.4103/0973-029X.99081.

M.W. Lingen, J.R. Kalmar, T. Karrison and P.M. Speight, Oral Oncol., 44, 10 (2008); doi:10.1016/j.oraloncology.2007.06.011.

Z. Cizek and V. Studlova, Talanta, 31, 547 (1984); doi:10.1016/0039-9140(84)80136-8.

S.B. Jonnalagadda and K. Nattar, Int. J. Chem. Kinet., 31, 83 (1999); doi:10.1002/(SICI)1097-4601(1999)31:2<83::AID-KIN1>3.0.CO;2-6.

S.B. Jonnalagadda and D. Tshabalala, Int. J. Chem. Kinet., 24, 999 (1992); doi:10.1002/kin.550241110.

S.A. Hamza, J.F. Iyun and S.O. Idris, J. Chem. Pharm. Res., 4, 6 (2012).

S.A. Hamza, J.F. Iyun and S.O. Idris, Arch. Appl. Soc. Res. (New York), 4, 10 (2012).

S.A. Hamza, J.F. Iyun and S.O. Idris, Der. Pharm. Chem., 4, 1 (2012).

B. Arikan and M. Tuncay, Colloids Surf. A, 273, 202 (2006); doi:10.1016/j.colsurfa.2005.08.025.

S.B. Jonnalagadda and N.R. Gollapalli, J. Chem. Educ., 77, 506 (2000); doi:10.1021/ed077p506.

A.I. Vogel, Quantitative Inorganic Analysis, ELBS, London, edn 3, p. 370, (1961).

J.C. Bailer, H.J. Emeleus, D. Nyholm and A.F. Trotman-Dickenson Comprehensive Inorganic Chemistry, Pergamon Press, Oxford, Vol. 2, p. 879 (1973).

Issue

Vol. 27 No. 4 (2015): Vol 27 Issue 4

Reduction of Toluidine Blue by Sulfur(IV) in Acetate Buffer Medium: Kinetics and Mechanism

Corresponding Author(s) : Pratik K. Sen

Abstract

Keywords

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