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

Author(s)

Morelli Frin, Karina P. ^[1] ; da Rocha, Denis C. ^[1] ; Mamud, Julia F. ^[1] ; Polo, Andre S. ^[1]

Affiliation

^[1] Univ Fed Abc, Av Dos Estados 5001, BR-09210170 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES; v. 17, n. 10, p. 1443-1449, OCT 1 2018.
• Web of Science Citations: 0

Abstract

Di-nuclear {[}[(NN)(CO)(3)Re](2)(trans-bpe)](PF6)(2) complexes, NN = 4,7-diphenyl-1,10-phenanthroline (ph(2)phen) or 4,7-dichloro-1,10-phenanthroline (Cl(2)phen) and trans-bpe = trans-1,2-bis(4-pyridyl)ethylene, were synthesized and characterized by H-1 NMR and UV-visible spectroscopy. Irradiation of acetonitrile solutions led to H-1 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 {[}[(ph(2)phen)(CO)(3)Re](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 {[}[(Cl(2)phen)(CO)(3)Re](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)(3)Re](2)(cis-bpe)](2+) complexes is able to efficiently photosensitize the generation of singlet O-2. (AU)

• FAPESP's process: 17/18063-0 - Evaluation of Re(I) luminescent compounds in bio-imaging and/or antitumor agents
• Grantee: Karina Passalacqua Morelli Frin
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/07289-7 - Evaluation of Re(I) polypyridyl compounds in CO2 photoreduction
• Grantee: Júlia Frata Mamud
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 16/21993-6 - Evaluation of Ru(II) and Re(I) polypyridyl compounds on photoactive devices
• Grantee: André Sarto Polo
• Support Opportunities: Regular Research Grants