THE ELECTRON TRANSFER REACTIONS OF 3,7-BIS(DIMETHYLAMINE)PHENOTHIONIUM CHLORIDE (METHYLENE BLUE) WITH OXYANIONS IN AQUEOUS ACIDIC MEDIUM

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dc.contributor.authorABDULAKEEM, Busari
dc.date.accessioned2014-03-03T11:29:00Z
dc.date.available2014-03-03T11:29:00Z
dc.date.issued2007-09
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT FOR THE AWARD OF MASTER OF SCIENCE DEGREE IN INORGANIC CHEMISTRY. DEPARTMENT OF CHEMISTRY FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA SEPTEMBER, 2007en_US
dc.description.abstractThe kinetics and mechanisms of the redox reactions of 3,7-bis (dimethylamine)phenothionium chloride (MB+) with the oxyanions, BrO3 -, S2O8 2- and SO3 2-, have been studied. The rate of the reaction is first order in each oxidant and reductant concentrations for the three reactions. MB+ was oxidized by BrO3 - and S2O8 2- and the order of reactivity is k2 (BrO3 -)  k2 (S2O8 2-). The MB+- S2O8 2- reaction was Ag+ catalysed. SO3 2- reduced MB+. The rates of the redox reactions of SO3 2- an S2O8 2- with MB+ show no acid dependence, while that with BrO3 - ion, showed acid independent and a second order acid dependence. All the reactions are affected by change in ionic strength. The stoichiometry is 2:3 for MB+: BrO3 - and 1:6 for MB+: S2O8 2-. The stoichiometry for the MB+- SO3 2- could not be determined. The overall rate equation for the three reactions can be represented as shown below: For the MB+: BrO3 - reaction: -1d[MB+] = k2[MB+][BrO3 -] 2 dt where k2 = 10.16  0.29 dm3 mol-1 s-1, at [H+] = 0.20 mol dm-3 μ = 0.50 mol dm-3 (NaCI) and T = 29.0  1.00C. For the Ag+ catalysed MB+: S2O8 2- reaction -d[MB+] = k2[MB+][S2O8 2-][Ag+] dt where k2 = 0.37  0.03 dm3 mol s-1 at [H+] = 1.0 x 10-4 mol dm-3 μ = 0.10 mol dm-3 (NaNO3), [Ag+] = 5.0 x 10-3 mol dm-3 and T= 26.0  1.00C For the MB+: SO3 2- reaction -d[MB+] = k2[MB+][SO3 2-] dt where k2 = (3.02  0.22) x 10-3 dm3 mol-1 s-1 at [H+] = 1.0 x 10-3 mol dm3 μ = 0.10 mol dm-3 (NaCI) and T = 25.0  1.00C Free radicals were detected in the MB+ reactions with S2O8 2- and SO3 2-. Spectroscopic investigation and kinetic evidence suggested the absence of short-lived intermediate complex in all the systems studied. The experimental results obtained for all the systems are in favour of the outersphere mechanism.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/3079
dc.language.isoenen_US
dc.subjectELECTRON TRANSFER REACTIONS,en_US
dc.subjectDIMETHYLAMINE,en_US
dc.subjectPHENOTHIONIUM CHLORIDE,en_US
dc.subjectMETHYLENE BLUE,en_US
dc.subjectOXYANIONS,en_US
dc.subjectAQUEOUS ACIDIC MEDIUMen_US
dc.titleTHE ELECTRON TRANSFER REACTIONS OF 3,7-BIS(DIMETHYLAMINE)PHENOTHIONIUM CHLORIDE (METHYLENE BLUE) WITH OXYANIONS IN AQUEOUS ACIDIC MEDIUMen_US
dc.typeThesisen_US
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