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Farhad, Nisar Ahmad
- A Study on Metal-ion Catalysed Oscillatory behaviour of Pyrogallol based BZ system
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Authors
Affiliations
1 Department of Chemistry, University of Kashmir, Srinagar-190006 (J&K), IN
1 Department of Chemistry, University of Kashmir, Srinagar-190006 (J&K), IN
Source
Asian Journal of Research in Chemistry, Vol 6, No 3 (2013), Pagination: 189-194Abstract
The influence of initial reagent concentrations and the temperature dependence on the Belousov-Zhabotinsky (BZ) system with Mn2+/Mn3+ and Ce3+/Ce4+ redox catalyst, inorganic bromate as oxidant and pyrogallol as organic substrate was studied in aqueous sulphuric acid medium (1.5 mol L-1). The reactions were monitored by potentiometry in oxidation reduction potential (ORP) mode. The aforesaid reagents were mixed with varying concentrations to evolve the optimal concentrations at which the reaction system exhibited better oscillations. The various oscillatory parameters such as induction period (tin), time period (tp), frequency (v), amplitude (A) and number of oscillations (n) were derived and the dependence of concentration of the reacting species on these oscillatory parameters was interpreted on the basis of the Field-Koros-Noyes mechanism. Further, the effect of temperature on the aforesaid oscillatory parameters was investigated. The corresponding activation parameters have been determined and the results showed good agreement with Arrhenius temperature dependence.Keywords
BZ, Pyrogallol, Oscillatory Parameters, Activation Parameters
References
- Pechenkin, A. B P Belousov and his reaction. J Biosci. 34; 2009: 365–371.
- Zhabotinsky, A M. Periodical oxidation of malonic acid in solution (a study of the Belousov reaction kinetics). Biofizika. 9; 1964:306-311.
- Noyes, R M. Chemical oscillations and instabilities. A generalized mechanism for bromate-driven oscillators controlled by bromide. J Am Chem Soc. 102; 1980: 4644–4649
- Field RJ, Koros E and Noyes RM. Oscillations in chemical systems. II. Thorough analysis of temporal oscillation in the bromate-cerium-malonic acid system. J Am Chem Soc. 94; 1972: 8649–8664.
- Zaikin AN and Zhabotinsky AM. Concentration Wave Propagation in Two-dimensional Liquid-phase Self-oscillating System. Nature. 225; 1970: 535 – 537.
- Epstein IR and Pojman JA. An Introduction to Nonlinear Chemical Dynamics: Oscillations, Waves, Patterns and Chaos. Oxford University Press, New York. 1998.
- Edelson D, Field RJ and Noyes, RM. Mechanistic details of the Belousov–Zhabotinskii oscillations. Int J Chem Kinet. 7; 1975: 417–432.
- Edelson D, Noyes RM and Field RJ. Mechanistic details of the Belousov–Zhabotinsky oscillations. II. The organic reaction subset. Int J Chem Kinet. 11; 1979: 155–164.
- Gyorgyi L, Turany T and Field RJ. Mechanistic details of the oscillatory Belousov-Zhabotinskii reaction. J Phy Chem. 94;1990: 7162–7170.
- Koros E, Burger M, Friedrich V, et al. Chemistry of Belousovtype oscillating reactions. Faraday Symp Chem Soc. 9;1974: 28-37.
- Kasperek GT and Bruice TC. Observations on an Oscillating Reaction. The Reaction of Potassium Bromate, Ceric Sulfate and a Dicarboxylic Acid. Inorg Chem. 10; 1971: 382-386.
- Ou CC and Jwo JJ. Kinetic Study of Some Reactions Related to the Mn(III)-Catalyzed Bromide –Saccharide Oscillating Reactions. Int J Chem Kinet. 23; 1991: 137-249.
- Salter LF and Sheppard JP. A dual-frequency Belousov Zhabotinskii oscillating reaction with ethyl acetoacetate as organic substrate. Int J Chem Kinet. 14; 1982: 815-821.
- Krisztina P, Maria W, Klara L, et al. Mechanistic Investigations of the BZ Reaction with Oxalic Acid Substrate. I. The Oscillatory Parameter Region and Rate Constants Measured for the Reactions of HOBr, HBrO2, and Acidic BrO3 - with Oxalic Acid. J Phys Chem A. 108; 2004: 5377–5385.
- Basavaraja C, Kulkarni VR, Mohan S, et al. Experimental studies on BZ reaction system containing oxalic acid and acetone as mixed organic substrate in a CSTR. Indian Journal of Chemistry : A. 43; 2004: 739-742.
- Lee SS and Jwo, JJ. Kinetic study of the Ce(III)- or Mn(II)- catalyzed Belousov–Zhabotinsky reactions with mixed organic acid/ketone substrates. Int J Chem Kinet. 30; 1998: 595-604.
- Sridevi V and Ramaswamy, R. Potential response in the uncatalyzed bromate oscillatory system. React Kinet Catal Lett. 65; 1998: 93-100.
- Yang CJ, Wang CS, Hung J Y, et al. Pyrogallol induces G2-M arrest in human lung cancer cells and inhibits tumor growth in an animal model. Lung Cancer. 66; 2009: 162-168.
- Saeki K, Hayakawa S, Isemura M, et al. Importance of a pyrogallol-type structure in catechin compounds for apoptosisinducing activity. Phytochemistry. 53; 2000: 391-394.
- Joharapurkar AA, Wanjari MM, Dixit PV, et al. Pyrogallol: A novel tool for screening immunomodulators. Indian J Pharmacol. 36; 2004: 355-359.
- Koros E. Monomolecular treatment of chemical oscillation. Nature. 251; 1974: 703-704.
- Blandamer MJ and Roberts DL. Analysis of the dependence on temperature of the frequency of oscillation of the Belousov- Zhabotinskii reaction. J Chem Soc Faraday Trans 1. 73;1977: 1056-1065.
- Yoshikawa, K. Distinct Activation Energies for Temporal and Spatial Oscillations in the Belousov-Zhabotinskii Reaction. Bull Chem Soc Japan. 55; 1982: 2042-2045.
- Fujieda S and Kawahito J. Caloric behaviour in the induction period of Belousov- Zhabotinskii reactions monitored by heat exchange calorimetry of batch type and the simultaneous estimation of the potentiometric aspect. Thermochim Acta. 1; 1992: 210-213.
- Rouff P. Antagonistic Balance in the Oregonator: About the Possibility of Temperature-Compensation in the Belousov- Zhabotinsky Reaction. Physica D. 84; 1995: 204-211.
- Ganaie NB and Peerzada G M. Effect of initial reagent concentrations on the oscillatory behavior of the BZ reaction in a batch reactor. Int J Chem Kinet. 41; 2009: 650-657.
- Nath MA and Ganaie NB, Rastogi RP, et al. Effect of temperature on oscillatory behaviour of the system containing isomers of hydroxybenzoic acid in batch reactor. E J Chem. 5; 2008: 832-837.