Novel Heteroleptic Ruthenium(II) Complexes with 2,2'- Bipyridines Containing a Series of Electron-Donor and Electron-Acceptor Substituents in 4,4'-Positions : Syntheses, Characterization, and Application as Sensitizers for ZnO Nanowire-Based Solar Cells
Salomón, Fernando F. (Universidad Nacional de Tucumán)
Vega, Nadia C. (Universidad Nacional de Tucumán)
Parella Coll, Teodor (Universitat Autònoma de Barcelona. Departament de Química)
Morán Vieyra, Faustino Eduardo (Universidad Nacional de Santiago del Estero)
Borsarelli, Claudio D. (Universidad Nacional de Santiago del Estero)
Longo, Claudia (University of Campinas)
Cattaneo, Mauricio (Universidad Nacional de Tucumán)
Katz, Néstor E. (Universidad Nacional de Tucumán)

Date:	2020
Abstract:	A novel series of complexes of the formula [Ru(4,4'-X-bpy)(Mebpy-CN)](PF) (X −CH, −OCH, −N(CH); Mebpy-CN = 4-methyl-2,2'-bipyridine-4'-carbonitrile) have been synthesized and characterized by spectroscopic, electrochemical, and photophysical techniques. Inclusion of the electron-withdrawing substituent −CN at one bpy ligand and different electron-donor groups −X at the 4,4'-positions of the other two bpy ligands produce a fine tuning of physicochemical properties. Redox potentials, electronic absorption maxima, and emission maxima correlate well with Hammett's σ parameters of X. Quantum mechanical calculations are consistent with experimental data. All the complexes can be anchored through the nitrile moiety of Mebpy-CN over ZnO nanowires in dye-sensitized solar cells that exhibit an improvement of light to electrical energy conversion efficiency as the electronic asymmetry increases in the series.
Grants:	Agencia Estatal de Investigación PGC2018-095808-B-I00
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	ACS omega, Vol. 5, Issue 4 (April 2020) , p. 8097-8107, ISSN 2470-1343

DOI: 10.1021/acsomega.0c00243
PMID: 32309719

11 p, 4.7 MB

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