Journal of Surface Science and Technology

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Photochemical Behaviour of [Co(NH3)5HC2O4]2+ in Microheterogeneous Media


Affiliations
1 A.B.N. Seal College, Couch Behar, India
2 Bethune College, Calcutta, India
3 Department of Chemical Technology, University College of Science and Technology, Calcutta-700 009, India
     

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In the present work a comparative study of the photochemical behaviour (steady-state photolysis) of oxalatopentaamminecobalt (III) perchlorate, [Co(NH3)5HC2O4](ClO4)2, in pure aqueous as well as in premicellar and micellar solutions of three different (anionic, cationic and non-ionic) surfactants has been undertaken. The photochemical reactivity of the complex has been found to charge in the following respects. (1) The photoaquation of ammonia does not take place in micellar solutions of all the three surfactants used. (2) The quantum yield of Co2+(ΦCo2+) changes as the concentration of surfactant changes with a concomitant change in the structure of the solution. The manner in which ΦCo2+ varies depends on the nature of the surfactant. The CMC of a surfactant can be determined from the plot of ΦCo2+ vs. -log [Surfactant]. (3) The effect of [CH3COO-] variation on ΦCo2+ is more prominent in micellar solutions.
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  • Photochemical Behaviour of [Co(NH3)5HC2O4]2+ in Microheterogeneous Media

Abstract Views: 172  |  PDF Views: 2

Authors

S. Saha
A.B.N. Seal College, Couch Behar, India
D. Mukherji
Bethune College, Calcutta, India
S. K. Sarkar
Department of Chemical Technology, University College of Science and Technology, Calcutta-700 009, India

Abstract


In the present work a comparative study of the photochemical behaviour (steady-state photolysis) of oxalatopentaamminecobalt (III) perchlorate, [Co(NH3)5HC2O4](ClO4)2, in pure aqueous as well as in premicellar and micellar solutions of three different (anionic, cationic and non-ionic) surfactants has been undertaken. The photochemical reactivity of the complex has been found to charge in the following respects. (1) The photoaquation of ammonia does not take place in micellar solutions of all the three surfactants used. (2) The quantum yield of Co2+(ΦCo2+) changes as the concentration of surfactant changes with a concomitant change in the structure of the solution. The manner in which ΦCo2+ varies depends on the nature of the surfactant. The CMC of a surfactant can be determined from the plot of ΦCo2+ vs. -log [Surfactant]. (3) The effect of [CH3COO-] variation on ΦCo2+ is more prominent in micellar solutions.