NDLI: Anion and ion-pair binding by a G-2 poly(ethylene imine) dendrimer

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bazzicalupi, Carla Giorgi, Claudia Bianchi, Antonio Gratteri, Paola Valtancoli, Barbara Mariani, Palma
Description	Author Affiliation: Bazzicalupi C ( Department of Chemistry Ugo Schiff, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy.)
Abstract	The second-generation poly(ethylene imine) dendrimer (L), based on ammonia as the initiating core molecule, forms anion and ion-pair complexes in aqueous solution. Speciation of the complex species formed and determination of the relevant stability constants were performed by means of potentiometric titration in a 0.10 M $NMe_{4}Cl$ solution at 298.1 K. Protonated forms of L interact with $NO_{3}^{−},$ $SO_{4}^{2−},$ $SeO_{4}^{2−},$ $HPO_{4}^{2−}$ and $H_{2}PO_{4}^{−}$ forming stable 1:1 anion complexes. The dendritic structure endows the molecule with a greater anion binding ability relative to analogous linear polyamines . It was previously reported that L forms stable metal complexes. We show here that protonated forms of the mononuclear complexes with $Cu^{2+},$ $Zn^{2+}$ and $Cd^{2+}$ bind these anions, and $Pb^{2+}$ complexes bind $NO_{3}^{−}.$ The resulting ion-pair complexes show considerable stability thanks to the cooperative effect of the oppositely charged partners. Molecular modelling calculations show that both anion– ligand and anion–metal ion interactions can participate in stabilizing such ion-pair complexes.
ISSN	14779226
Issue Number	34
Volume Number	42
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-09-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Dendrimers Chemistry Imines Polyethylenes Ammonia Anions Ligands Journal Article
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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