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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.)

Synthesis, electrochemical and photochemical properties of neutral Ir(III) complex based on 3-Iodopyridine-2-carboxylate ligand

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Goncalves, Marcia R. [1] ; Frin, Karina P. M. [1]
Total Authors: 2
[1] Fed Univ ABC UFABC, Av Estados 5001, BR-09210170 Santo Andre, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Molecular Structure; v. 1224, JAN 15 2021.
Web of Science Citations: 0

In this work, we report the synthesis and characterization of mer-{[}Ir(ppy)(2)(Ipic)], where ppy = 2-phenylpyridine and Ipic = 3-iodopyridine-2-carboxylate, as well as, the electrochemical and photophysical properties in solution. The electronic absorption spectra profile can be divided into two main regions: intense bands in the high energy UV-region (200-300 nm) assigned to ligand centered (IL) transition on both the cyclometalated (ppy) and the ancillary (Ipic) ligands, and lower intensity absorption bands located in the less energetic region (320-460 nm) can be experimentally assigned to the spin-allowed metal-to-ligand charge transfer (1 MLCT) transition and the spin-forbidden (MLCT)-M-3. From the electrochemical results, were obtained the oxidation peak (Ir(III)-> Ir(IV) couple) at +0.59 V resulting in a HOMO of -5.09 eV, and the reduction potentials -1.65 and -2.00 V, which can be attributed to the Ipic and ppy, respectively. Additionally, it is possible to observe that the introduction of the halogen atom promotes a significant variation in LUMO energy (2.75 eV), while the HOMO level is almost unchanged. The complex displayed broad and structureless emission spectra in acetonitrile (lambda(max) = 510 nm, phi = 0.0032 and tau = 160 ns) and dichloromethane (lambda(max) = 510 nm, 525 nm) solution at room temperature but becomes structured (lambda(max) = 490, 522 nm) in propionitrile:butyronitrile at 77 K, indicating that the emitting state at room temperature has a mixed (MLCT)-M-3-(LC)-L-3 character but at 77 K the emission has a strong (LC)-L-3 character. (C) 2020 Elsevier B.V. All rights reserved. (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: 17/18063-0 - Evaluation of Re(I) luminescent compounds in bio-imaging and/or antitumor agents
Grantee:Karina Passalacqua Morelli Frin
Support type: Regular Research Grants