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

Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry
Matteo SavastanoAntonio Bianchi

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.

References

Aug 18, 2005·Accounts of Chemical Research·Kristin Bowman-James
Oct 8, 2005·Journal of Computational Chemistry·Jay L BanksRonald M Levy
Mar 10, 2009·Inorganic Chemistry·Carla BazzicalupiBarbara Valtancoli
Mar 30, 2013·Dalton Transactions : an International Journal of Inorganic Chemistry·Carla BazzicalupiBarbara Valtancoli
Nov 5, 2014·Inorganic Chemistry·Carla BazzicalupiMatteo Savastano
Feb 7, 2015·Chemical Communications : Chem Comm·Carla BazzicalupiFracisco Morales-Lara
Mar 3, 2015·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Elena Salvador SerranoAntonio Bianchi

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Citations

Mar 21, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Matteo SavastanoCarla Bazzicalupi

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