66
G.V. Porcal et al. / Journal of Photochemistry and Photobiology A: Chemistry 219 (2011) 62–66
It can be seen in the table that the efficiency in CTAC is higher
M. Kondo, I.A. Heisler, J. Conyard, J.P.H. Rivett, S.R. Meech, J. Phys. Chem. B 113
(2009) 1632–1639;
than unity. We think that this is probably due to the experimental
uncertainties arising from an underestimation of the triplet yield
an extra source of RF, not considered in the mechanism, might be a
process originating in the singlet excited state of RZ. We disregard
this route because at the TEOA concentrations used there is not sin-
glet quenching in homogeneousmedia [16], and asdiscussedabove,
the similar triplet quenching rate constants in micellar and homo-
geneous media indicates that there is not a high local concentration
in the vicinity of the dye.
In summary, the photodeoxygenation yield of RZ is greatly
affected by the interface in the organized systems. It is higher when
the interface is positive and it is interpreted by a decrease of the
recombination rate of the radicals formed in the initial electron
transfer step. Negative and zwitterionic interfaces have no effect
on the quantum yield.
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[22] G.V. Porcal, M.S. Altamirano, C.A. Glusko, S.G. Bertolotti, C.M. Previtali, Dyes
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Financial support from the Consejo Nacional de Investigaciones
Científicas y Técnicas (CONICET Argentina, PIP 5909, 5605), Agencia
Nacional de Promoción Científica (PICTO 30244/05; PICT 32351/05)
and Universidad Nacional de Río Cuarto is gratefully acknowledged.
S.G.B. and C.M.P. hold a research position at CONICET. G.V.P. thanks
CONICET for a research fellowship.
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