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Molecules 2017, 22(5), 816; doi:10.3390/molecules22050816

Cation, Anion and Ion-Pair Complexes with a G-3 Poly(ethylene imine) Dendrimer in Aqueous Solution

1
Department of Chemistry “Ugo Schiff”, via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
2
NEUROFARBA Department, Pharmaceutical and Nutraceutical Section, and Laboratory of Molecular Modeling Cheminformatics & QSAR, University of Florence, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Ashok Kakkar
Received: 12 April 2017 / Revised: 12 May 2017 / Accepted: 12 May 2017 / Published: 16 May 2017
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Abstract

The G-3 poly(ethylene imine) ligand L2 shows a multifaceted coordination ability, being able to bind metal cations, anions and ion-pairs. The equilibrium constants for the formation of metal (Cu2+, Zn2+), anion (SO42−) and ion-pair (Cu2+/SO42−) complexes were determined in 0.1 M Me4NCl aqueous solution at 298.1 ± 0.1 K by means of potentiometric titrations. Thanks to its dendrimeric nature, L2 can form highly nucleated metal complexes, such as Cu5L210+ and Zn4L28+, in successive and well-defined complexation steps. Protonated forms of L2 give rise to relatively weak anion complexes with SO42−, but the addition of Cu2+ significantly enhances the binding ability of the ligand toward this anion below pH 9. In more alkaline solutions, an opposite trend is observed. The coordination properties of L2 are discussed with the support of modelling calculations. According to results, L2 is a promising molecule for the preparation of solid supported materials for the recovery of cations and anions from aqueous media and/or for applications in heterogeneous catalysis. View Full-Text
Keywords: copper; zinc; dendrimers; poly(ethylene imine); polynuclear complexes; anion complexes; ion-pair complexes copper; zinc; dendrimers; poly(ethylene imine); polynuclear complexes; anion complexes; ion-pair complexes
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Savastano, M.; Bazzicalupi, C.; Giorgi, C.; Gratteri, P.; Bianchi, A. Cation, Anion and Ion-Pair Complexes with a G-3 Poly(ethylene imine) Dendrimer in Aqueous Solution. Molecules 2017, 22, 816.

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