Utilize este identificador para referenciar este registo: http://hdl.handle.net/10451/21312
Título: Tetraazamacrocycle bearing quinoline pendant arms and its complexation properties
Autor: Cui, XL
Cabral, MF
Costa, J
Delgado, R
Palavras-chave: Chemistry, Inorganic & Nuclear
Data: 2003
Editora: ELSEVIER SCIENCE SA
Citação: INORGANICA CHIMICA ACTA. - Vol. 356 (DEC 3 2003), p. 133-141
Resumo: A new tetraazamacrocycle containing two 5-chloro-8-hydroxyquinoline side arms, L-1, was synthesized. The protonation constants of L-1 and the stability constants of its complexes with Cu2+, Zn2+, Cd2+ and Pb2+ were determined by potentiometric or spectrophotometric methods, at 20 degreesC in methanol:water (5:1, v/v) and ionic strength 0.10 mol dm(-3) in tetrabutylammonium nitrate (TBAN). Compound L-1 has three high protonation constants, the most basic centres being both phenolates of the arms. Mono- and dinuclear complexes were found in solution for all the metal ions, the complexes of copper are thermodynamically very stable, and the dinuclear complexes of lead(II) are the predominant species even in 1:1 mixtures. UV-Vis spectra of some complexes and EPR of the copper ones confirmed the presence of dinuclear complexes. (C) 2003 Elsevier B.V. All rights reserved.
URI: http://hdl.handle.net/10451/21312
DOI: http://dx.doi.org/10.1016/S0020-1693(03)00465-1
ISSN: 0020-1693
Aparece nas colecções:FF - Produção Científica 2000-2009

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