Synthesis, characterization, photophysical and electrochemical properties of fac-tricarbonyl(4,7-dichloro-1,10-phenanthroline)rhenium(I) complexes

Author(s)

Goncalves, Marcia R. ^[1] ; Frin, Karina P. M. ^[1]

Affiliation

^[1] Fed Univ ABC UFABC, BR-09210170 Santo Andre, SP - Brazil

• Document type: Journal article
• Source: Polyhedron; v. 97, p. 112-117, SEP 5 2015.
• Web of Science Citations: 18

Abstract

The fac-{[}Re(CO)(3)Cl(Cl(2)phen)] and fac-{[}Re(CO)(3)(py)(Cl(2)phen)]PF6 complexes were synthesized, purified and characterized by H-1 NMR, UV-Vis and IR spectroscopies and both photophysical and electrochemical behaviors were investigated. The electronic absorption spectra exhibit two main absorption bands: the higher energy band, which was assigned to IL, and the lower energy band, assigned to MLCT. The fac-{[}ReCl(Cl(2)phen)(CO)(3)] and fac-{[}Re(py)(Cl(2)phen)(CO)(3)]PF6 complexes showed emission at room temperature in both CH3CN solution (lambda(max) = 640 nm, phi = 0.0027; lambda(max) = 590 nm, phi = 0.055) and rigid media (lambda(max) = 590 nm, lambda(max) = 535 nm in PMMA) arising from the lowest lying metal to ligand charge transfer ((MLCTRe -> Cl2phen)-M-3) excited state. Additionally, the PVK emission band is almost completely quenched in the presence of 4% rhenium(I) complex. Both compounds showed metal-centered oxidation, Re(I) -> (II), and ligand-based reduction, Cl(2)phen -> Cl(2)phen({*}-), in CH2Cl2 solution. The highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy levels of both complexes were estimated. The electrochemical and emission properties indicate a potential application of the rhenium(I) compounds in OLED devices. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 11/23408-0 - Syntheses, characterization and photophysical investigation of rhenium (I) complexes
• Grantee: Karina Passalacqua Morelli Frin
• Support Opportunities: Regular Research Grants