Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4963
Título: The solvation and electrochemical behaviour of Copper acetylacetonate complexes in ionic liquids
Autor: Nunes, Patrique
Nagy, Nora V.
Alegria, Elisabete C. B. A.
Pombeiro, Armando J. L.
Correia, Isabel
Palavras-chave: Copper complexes
Ionic liquids
Data: 2014
Editora: Elsevier Science BV
Citação: NUNES, Patrique; [et al] – The solvation and electrochemical behaviour of Copper acetylacetonate complexes in ionic liquids. Journal of Molecular Structure. ISSN: 0022-2860. Vol. 160 (2014), pp. 142-149
Resumo: The behavior of copper(II) complexes of pentane-2,4-dione and 1,1,1,5,5,5-hexafluoro-2,4-pentanedione, [Cu(acac)(2) (1) and [Cu(HFacac)(2)(H2O)] (2), in ionic liquids and molecular organic solvents, was studied by spectroscopic and electrochemical techniques. The electron paramagnetic resonance characterization (EPR) showed well-resolved spectra in most solvents. In general the EPR spectra of [Cu(acac)(2)] show higher g(z) values and lower hyperfine coupling constants, A(z), in ionic liquids than in organic solvents, in agreement with longer Cu-O bond lengths and higher electron charge in the copper ion in the ionic liquids, suggesting coordination of the ionic liquid anions. For [Cu(HFacac)(2)(H2O)] the opposite was observed suggesting that in ionic liquids there is no coordination of the anions and that the complex is tetrahedrically distorted. The redox properties of the Cu(II) complexes were investigated by cyclic voltammetry (CV) at a Pt electrode (d = 1 mm), in bmimBF(4) and bmimNTf(2) ionic liquids and, for comparative purposes, in neat organic solvents. The neutral copper(II) complexes undergo irreversible reductions to Cu(I) and Cu(0) species in both ILs and common organic solvents (CH2Cl2 or acetonitrile), but, in ILs, they are usually more easier to reduce (less cathodic reduction potential) than in the organic solvents. Moreover, 1 and 2 are easier to reduce in bmimNTf(2) than in bmimBF(4) ionic liquid. (C) 2013 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4963
DOI: 10.1016/j.molstruc.2013.12.025
ISSN: 0022-2860
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S0020169313005252#
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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