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Open AccessArticle

Redox-Modulations of Photophysical and Single-molecule Magnet Properties in Ytterbium Complexes Involving Extended-TTF Triads

1
Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)—UMR 6226, 35000 Rennes, France
2
Univ Lyon, Ens de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, Laboratoire de Chimie, F69342 Lyon, France
3
G. A. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, GSP-445, Tropinina str. 49, 603950 Nizhny Novgorod, Russia
*
Authors to whom correspondence should be addressed.
Academic Editors: Dawid Pinkowicz and Robert Podgajny
Molecules 2020, 25(3), 492; https://doi.org/10.3390/molecules25030492
Received: 20 December 2019 / Revised: 20 January 2020 / Accepted: 22 January 2020 / Published: 23 January 2020
(This article belongs to the Special Issue Functional Magnetic Molecular Materials)
The reaction between the 2,2’-benzene-1,4-diylbis(6-hydroxy-4,7-di-tert-butyl-1,3-benzodithiol-2-ylium-5-olate triad (H2SQ) and the metallo-precursor [Yb(hfac)3]⋅2H2O led to the formation of a dinuclear coordination complex of formula [Yb2(hfac)6(H2SQ)]⋅0.5CH2Cl2 (H2SQ-Yb). After chemical oxidation of H2SQ in 2,2’-cyclohexa-2,5-diene-1,4-diylidenebis(4,7-di-tert-butyl-1,3-benzodithiole-5,6-dione (Q), the latter triad reacted with the [Yb(hfac)3]⋅2H2O precursor to give the dinuclear complex of formula [Yb2(hfac)6(Q)] (Q-Yb). Both dinuclear compounds have been characterized by X-ray diffraction, DFT optimized structure and electronic absorption spectra. They behaved as field-induced Single-Molecule Magnets (SMMs) nevertheless the chemical oxidation of the semiquinone to quinone moieties accelerated by a factor of five the relaxation time of the magnetization of Q-Yb compared to the one for H2SQ-Yb. The H2SQ triad efficiently sensitized the YbIII luminescence while the chemical oxidation of H2SQ into Q induced strong modification of the absorption properties and thus a quenching of the YbIII luminescence for Q-Yb. In other words, both magnetic modulation and luminescence quenching are reached by the oxidation of the protonated semiquinone into quinone. View Full-Text
Keywords: ytterbium; extended-tetrathiafulvalene; electro-activity; single-molecule magnet; luminescence ytterbium; extended-tetrathiafulvalene; electro-activity; single-molecule magnet; luminescence
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MDPI and ACS Style

Lefeuvre, B.; Flores Gonzalez, J.; Gendron, F.; Dorcet, V.; Riobé, F.; Cherkasov, V.; Maury, O.; Le Guennic, B.; Cador, O.; Kuropatov, V.; Pointillart, F. Redox-Modulations of Photophysical and Single-molecule Magnet Properties in Ytterbium Complexes Involving Extended-TTF Triads. Molecules 2020, 25, 492. https://doi.org/10.3390/molecules25030492

AMA Style

Lefeuvre B, Flores Gonzalez J, Gendron F, Dorcet V, Riobé F, Cherkasov V, Maury O, Le Guennic B, Cador O, Kuropatov V, Pointillart F. Redox-Modulations of Photophysical and Single-molecule Magnet Properties in Ytterbium Complexes Involving Extended-TTF Triads. Molecules. 2020; 25(3):492. https://doi.org/10.3390/molecules25030492

Chicago/Turabian Style

Lefeuvre, Bertrand; Flores Gonzalez, Jessica; Gendron, Frédéric; Dorcet, Vincent; Riobé, François; Cherkasov, Vladimir; Maury, Olivier; Le Guennic, Boris; Cador, Olivier; Kuropatov, Viacheslav; Pointillart, Fabrice. 2020. "Redox-Modulations of Photophysical and Single-molecule Magnet Properties in Ytterbium Complexes Involving Extended-TTF Triads" Molecules 25, no. 3: 492. https://doi.org/10.3390/molecules25030492

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