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Issue 10, 2018
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Photoisomerization of di-nuclear rhenium(I) bpe-based compounds

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Di-nuclear [{(NN)(CO)3Re}2(trans-bpe)](PF6)2 complexes, NN = 4,7-diphenyl-1,10-phenanthroline (ph2phen) or 4,7-dichloro-1,10-phenanthroline (Cl2phen) and trans-bpe = trans-1,2-bis(4-pyridyl)ethylene, were synthesized and characterized by 1H NMR and UV-visible spectroscopy. Irradiation of acetonitrile solutions led to 1H NMR and UV-visible spectral changes ascribed to trans-to-cis photoisomerization processes showing that the presence of another Re(I)-moiety does not preclude the photoisomerization process. Quantum yields for the di-nuclear isomerization of [{(ph2phen)(CO)3Re}2(trans-bpe)]2+ were higher than those for the corresponding mono-nuclear compound process. Additionally, the higher quantum yield obtained with 254 nm irradiation for [{(Cl2phen)(CO)3Re}2(trans-bpe)]2+ showed, for the first time, that the singlet pathway could also be accessed in addition to the usually observed triplet one. The luminescence in fluid solution observed for the [{(NN)(CO)3Re}2(cis-bpe)]2+ complexes is able to efficiently photosensitize the generation of singlet O2.

Graphical abstract: Photoisomerization of di-nuclear rhenium(i) bpe-based compounds

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Publication details

The article was received on 29 Jun 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018

Article type: Paper
DOI: 10.1039/C8PP00274F
Photochem. Photobiol. Sci., 2018,17, 1443-1449

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    Photoisomerization of di-nuclear rhenium(I) bpe-based compounds

    K. P. Morelli Frin, D. C. da Rocha, J. F. Mamud and A. S. Polo, Photochem. Photobiol. Sci., 2018, 17, 1443
    DOI: 10.1039/C8PP00274F

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