Browsing by Author "Ige, J."
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Ogunlusi, G.O.; Ige, J.; Oyetunji, O.A.; Ojo, J.F. (Springer Science+Business Media B.V., http://www.springer.com/chemistry/journal/11243, NaN, 2009)[more][less]
Abstract: The kinetics of the reactions between azidopentacyanocobaltate(III), Co(CN)5N3 3-, and iron(II) polypyridyl complexes, Fe(LL)3 2? (LL = bipy, phen), have been studied in both neutral and acidic aqueous solutions at I = 0.1 mol dm-3 NaCl. The reactions were carried out under pseudo-first-order conditions in which the concentration of Fe(LL)32+ was kept constant, and the second-order rate constants obtained for the reactions at 35 C were within the range of 0.156–0.219 dm3 mol-1 s-1 for LL = bipy and 0.090–0.118 dm3 mol-1 s-1 for LL = phen. Activation parameters were measured for these systems. The dependence of reaction rates on acid was studied in the range [H+] = 0.001–0.008 mol dm-3. The reaction in acid medium shows interesting kinetics. Two reactive species were identified in acid medium, namely, the protonated cobalt complex and the azido-bridged binuclear complex. The electron-transfer process is proposed to go by mixed outerand inner-sphere mechanisms in acid medium, in which electron transfer through the bridged inner-sphere complex (k5) is slower than through the outer-sphere path (k4). Description: Symbols may not appear as they are in the original abstracts. URI: http://hdl.handle.net/10311/1035 Files in this item: 1
Ogunlusi_TMC_2009.pdf (948.9Kb)
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