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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.)

Z to E light-activated isomerization of alpha-pyridyl-N-arylnitrone ligands sensitized by rhenium(I) polypyridyl complexes

Full text
Author(s):
Mamud, Julia F. [1] ; Biazolla, Giovanna [1] ; Marques, Caroline S. [1] ; Cerchiaro, Giselle [1] ; de Queiroz, Thiago B. [1] ; Keppler, Artur F. [1] ; Polo, Andre S. [1]
Total Authors: 7
Affiliation:
[1] Univ Fed ABC, Av Estados 5001, Santo Andre, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Inorganica Chimica Acta; v. 514, JAN 1 2021.
Web of Science Citations: 0
Abstract

A series of rhenium(I) polypyridyl compounds, bearing photoisomerizable nitrones as ligands, was synthesized and characterized by several techniques. The photochemical and photophysical behaviors of the compounds were investigated. Upon irradiation, acetonitrile solutions of the nitrones, or their respective complexes, exhibit changes in absorption, emission, and FTIR spectra. FTIR revealed the formation of the respective anilide as the photoproducts of irradiation of the uncoordinated nitrones, while irradiation of the complexes resulted in Z -> E due to the photosensitized isomerization of the coordinated ligand, also confirmed by HPLC-MS and H-1 NMR. The photoisomerization quantum yields are dependent on the nature of the nitrone substituent, which changes the energy of the 3(ILZ-NitX) excited state, which is populated by photosensitization. (MLCT)-M-3 becomes the lowestlying excited state in the E-product and results in an increase in emission intensity. The changes in spectroscopic properties of the Z or E coordinated nitrones can be exploited for molecular devices such as photosensors. (AU)

FAPESP's process: 16/21993-6 - Evaluation of Ru(II) and Re(I) polypyridyl compounds on photoactive devices
Grantee:André Sarto Polo
Support type: Regular Research Grants
FAPESP's process: 18/14152-0 - Studies for Prion Protein Cellular and metallic ions in oxidative stress
Grantee:Giselle Cerchiaro
Support type: Regular Research Grants
FAPESP's process: 12/07717-5 - Nitrones and hydroxylamines with pharmacological properties: synthesis, exploration of antioxidant activity and cellular studies
Grantee:Artur Franz Keppler
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 15/20007-5 - Optimization of antioxidant properties of nitrone containing compounds with pharmacological properties
Grantee:Giovanna Biazolla
Support type: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 17/07289-7 - Evaluation of Re(I) polypyridyl compounds in CO2 photoreduction
Grantee:Júlia Frata Mamud
Support type: Scholarships in Brazil - Scientific Initiation