Reactive nitrogen/oxygen species production by nitro/nitrosyl supramolecular ruthenium porphyrin complexes.
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2017
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Abstract
This manuscript reports on new nitro/nitrosyl Ru-based complexes, which were synthesized with the
purpose of using them as precursors to obtain supramolecular ruthenium porphyrin species ({TPyP[Ru
(NO2)(5,50-Mebipy)2]4}(PF6)4) and ({TPyP[Ru(NO)(5,50-Mebipy)2]4}(PF6)12). The photochemical and
photophysical properties of these porphyrin species were investigated. Results show that the complex
containing nitrite is able to produce NO by homolytic O—NO cleavage (FPPh
NO = 0.05) while the {TPyP[Ru
(NO)(5,50-Mebipy)2]4}(PF6)12 does it by direct labilization (FPPh
NO = 0.53) of the Ru NO bond.
Furthermore, a triplet quantum yield of 0.09 and 0.27 was observed for complexes containing nitrite
and nitric oxide, respectively. The reactive oxygen species quantum yield for the complex {TPyP[Ru(NO)
(5,50-Mebipy)2]4}(PF6)12 (0.78) is consistent with the sum of quantum yields NO release (0.53) and triplet
state (0.27), which suggests that both processes participate in the formation of the reactive species. Our
results show that combining these characteristics, NO production and triplet states, on the same platform
could induce a synergic effect, leading to a considerable improvement in the photodynamic action of
these complexes.
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Keywords
Photorelease, Triplet states, Photophysical properties
Citation
BARBOSA, M. I. F. et al. Reactive nitrogen/oxygen species production by nitro/nitrosyl supramolecular ruthenium porphyrin complexes Journal of Photochemistry and Photobiology. A, Chemistry, v. 338, p. 152-160, abr. 2017. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1010603016309406>. Acesso em: 15 set. 2017.