Competitive complexation by ligand and solvent: polarographic characterization of ATRP catalyst polyamine-copper complexes in acetonitrile + water mixed solvents
Articolo
Data di Pubblicazione:
2004
Citazione:
Competitive complexation by ligand and solvent: polarographic characterization of ATRP catalyst polyamine-copper complexes in acetonitrile + water mixed solvents / G. Di Silvestro, C. M. Yuan, P. R. Mussini. - In: JOURNAL OF SOLUTION CHEMISTRY. - ISSN 0095-9782. - 33:8(2004), pp. 923-940.
Abstract:
In the Atom Transfer Radical Polymerization (ATRP) technique, the suggested polymerization scheme is pivoted by a metal complex acting as a redox catalyst able to coordinate with the incipient radicals. The development of an a priori criterion of choice of the best (complex + solvent) combination is one of the current topics in this field. In this context we performed polarographic investigations on copper complexes with multidentate amino ligands (TMEDA and Me 6TREN, plus acetonitrile as a reference) in water and in water + acetonitrile mixed solvents. In the latter case we took into account the competition between the co-solvent acetonitrile [a weaker ligand, but concentrated, selectively stabilizing Cu(I)], and the polyamine [a stronger ligand, but diluted, preferentially stabilizing Cu(II)], achieving further stabilization of the complexed copper, with a narrow potential range of stability as Cu(I), which is modulated through the acetonitrile/polyamine ratio. An interpretative scheme is presented.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
G. Di Silvestro, C. M. Yuan, P. R. Mussini
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