INVESTIGADORES
DENOFRIO Maria Paula
congresos y reuniones científicas
Título:
Study of iodide as selective quencher of triplet excited states of pterin and lumazine
Autor/es:
M. PAULA DENOFRIO; CAROLINA LORENTE; PETER R. OGILBY; ANDRéS H. THOMAS
Reunión:
Encuentro; XI Encuentro Latinoamericano de Fotoquímica y Fotobiología (ELAFOT); 2012
Resumen:
It has been
demonstrated that
pteridines are able to act as efficient
sensitizers in photoinduced oxidations. These processes havebeen well characterized for thosecases where it was used 2-aminopteridine-4(3H)-one
(pterin; denoted Ptr) and pteridine-2,4(1,3H)-dione (lumazine; denoted
Lum). as photosensitizers and the nucleotides 2′-deoxyguanosine
5′-monophosphate (dGMP) and 2′-deoxyadenosine
5′-monophosphate (dAMP) as targets.(1-5)
It is
interesting to establish the nature, singlet (1S*) or triplet (3T*), of the electronic excited
states involved in such
processes. In this regard, the
development and optimization of routine
techniques that allow distinguishing
from which excited state the photosensitization
occurs becomes relevant. In thissense, a good example is the use of certain species which under
controlled working conditions can deactivate selectively an excited electronic
state.(6)
In this work, we present results of
the selective deactivationof triplet excited states of Ptr and Lumby iodide anion.
The method was applied to the reactions of dGMPand dAMP photosensitizationpreviously studied.
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