Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/4964
Título: The solvation and redox behaviour of mixed ligand COPPER(II) complexes of acetylacetonate and aromatic dimines in ionic liquids
Autor: Nunes, Patrique
Nagy, Nora V.
Alegria, Elisabete Clara Bastos do Amaral
Pombeiro, Armando J. L.
Correia, Isabel
Palavras-chave: Cationic copper complexes
Ionic liquids
EPR
Cyclic voltammetry
Data: 1-Jan-2014
Editora: Elsevier Science SA
Citação: NUNES, Patrique; [et al] – The solvation and redox behaviour of mixed ligand COPPER(II) complexes of acetylacetonate and aromatic dimines in ionic liquids. Inorganica Chimica Acta. ISSN: 0020-1693. Vol. 409 (2014), pp. 465-471
Resumo: The behavior of two cationic copper complexes of acetylacetonate and 2,2'-bipyridine or 1,10-phenanthroline, [Cu(acac)(bipy)]Cl (1) and [Cu(acac)(phen)]Cl (2), in organic solvents and ionic liquids, was studied by spectroscopic and electrochemical techniques. Both complexes showed solvatochromism in ionic liquids although no correlation with solvent parameters could be obtained. By EPR spectroscopy rhombic spectra with well-resolved superhyperfine structure were obtained in most ionic liquids. The spin Hamiltonian parameters suggest a square pyramidal geometry with coordination of the ionic liquid anion. The redox properties of the complexes were investigated by cyclic voltammetry at a Pt electrode (d = 1 mm) in bmimBF(4) and bmimNTf(2) ionic liquids. Both complexes 1 and 2 are electrochemically reduced in these ionic media at more negative potentials than when using organic solvents. This is in agreement with the EPR characterization, which shows lower A(z) and higher g(z) values for the complexes dissolved in ionic liquids, than in organic solvents, due to higher electron density at the copper center. The anion basicity order obtained by EPR is NTf2-, N(CN)(2)(-), MeSO4- and Me2PO4-, which agrees with previous determinations. (C) 2013 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/4964
DOI: 10.1016/j.ica.2013.09.040
ISSN: 0020-1693
1873-3255
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos

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