Interaction of polyoxometalates with linear polyamines

Polyoxometalates (POMs) are inorganic metal oxoanions with a negative charge, stabilized in the solid state by the corresponding number of countercations and possibly protons. In aqueous solution, the dissociation of all ion pairs is not necessarily quantitative because this would result in strong e...

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Bibliographic Details
Published in:Colloid and polymer science 2013-05, Vol.291 (5), p.1219-1226
Main Authors: Ball, Vincent, Barsukova-Stuckart, Maria, Kortz, Ulrich
Format: Article
Language:English
Subjects:
Acetal resins
Aminoacid polymers
Applied sciences
Characterization and Evaluation of Materials
Charge
Chemistry
Chemistry and Materials Science
Complex Fluids and Microfluidics
Electrolytes
Exact sciences and technology
Food Science
Hydrobromides
Ion pairs
Nanotechnology and Microengineering
Organic polymers
Original Contribution
Physical Chemistry
Physicochemistry of polymers
Polyamines
Polymer Sciences
Precipitates
Precipitation
Properties and characterization
Soft and Granular Matter
Solution and gel properties
Synthetic biopolymers
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Summary:Polyoxometalates (POMs) are inorganic metal oxoanions with a negative charge, stabilized in the solid state by the corresponding number of countercations and possibly protons. In aqueous solution, the dissociation of all ion pairs is not necessarily quantitative because this would result in strong electrostatic repulsion among the polyanions. In the present communication, we show that the effective charge of the donut-shaped 30-tungsto-5-phosphate [NaP 5 W 30 O 110 ] 14− (P 5 W 30 ) is close to its “structural charge” of 14 elementary negative charges in the presence of linear polyamines, namely, poly(allylamine hydrobromide) and poly( l -lysine hydrobromide) in a 10-mM NaBr electrolyte. When phase separation occurs, leading to a precipitate (rich in polyanion) and an almost clear supernatant, the charge ratio of the number of moles of cationic groups to polyanion is close to 14, showing that the effective charge in a solution of P 5 W 30 is indeed equal to −14 e in the presence of polycations.
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-012-2852-2