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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photophysical properties of rhenium(I) complexes and photosensitized generation of singlet oxygen

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Ramos, Luiz Duarte ; da Cruz, Hugo Moreira ; Frin, Karina P. Morelli
Total Authors: 3
Document type: Journal article
Source: PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES; v. 16, n. 4, p. 459-466, APR 1 2017.
Web of Science Citations: 13

fac-{[}Re(ampy)(CO)(3)(NN)](+) complexes (ampy = 2-aminomethylpyridine and NN = 1,10-phenanthroline (phen), and 2,2'-bipyridine (bpy)) were synthesized, purified and characterized by proton nuclear magnetic resonance (H-1 NMR), UV-visible and Fourier-transformed infrared (FT-IR) spectroscopies, and their photophysical properties were investigated using steady state and time-resolved emission spectroscopies. The electronic absorption spectra exhibit two main absorption bands: the higher energy band, which was assigned to intraligand transition (IL), and the lower energy band assigned to metal-to-ligand charge transfer (MLCT). Both complexes showed emission at room temperature in a CH3CN solution (lambda(max) = 560 nm, phi = 0.091, tau = 560 ns for fac-{[}Re(ampy)(CO)(3)(phen)](+); lambda(max) = 568 nm, phi = 0.024, tau = 100 ns for fac-{[}Re(ampy)(CO)(3)(bpy)](+)) and rigid media (lambda(max) = 530 nm, tau = 3300 ns for fac-{[}Re(ampy)(CO)(3)(phen)](+); lambda(max) = 530 nm, tau = 853 ns for fac-{[}Re(ampy)(CO)(3)(bpy)](+)) arising from the lowest lying (MLCTRe)-M-3 (>NN) excited state. Both complexes along with fac-{[}Re(L)(CO)(3)(NN)](+/0) complexes, L = Cl or pyridine, were capable of efficiently photosensitizing the generation of singlet oxygen with quantum yield in the range of 0.59-0.28. These results highlight the potential application of fac-{[}Re(L)(CO) 3(NN)](+/0) complexes in the development of sensitizers for the generation of singlet oxygen. (AU)

FAPESP's process: 15/13149-8 - Polypyridynic rhenium(I) complexes: syntheses, investigation of photophysical properties and application as luminescent probes and/or therapeutic agents
Grantee:Karina Passalacqua Morelli Frin
Support type: Regular Research Grants
FAPESP's process: 11/23408-0 - Syntheses, characterization and photophysical investigation of rhenium (I) complexes
Grantee:Karina Passalacqua Morelli Frin
Support type: Regular Research Grants