Water-Soluble Reversible Coordination Polymers: Chains and Rings
| Autor: | G.J. Fleer, Ernst J. R. Sudhölter, Antonius T. M. Marcelis, Nicolaas A. M. Besseling, P. de Waard, Tina Vermonden, M.A. Cohen Stuart, J. van der Gucht |
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| Rok vydání: | 2003 |
| Předmět: |
spectroscopy
Polymers and Plastics Laboratorium voor Fysische chemie en Kolloïdkunde Biophysics Concentration effect dna Reversible reaction copper(i) Inorganic Chemistry Viscosity Polymer chemistry Materials Chemistry Reduced viscosity Physical Chemistry and Colloid Science supramolecular polymers chemistry.chemical_classification Aqueous solution Chemistry Ligand Organic Chemistry Polymer Organische Chemie Crystallography Biofysica electrochemistry Coordination polymerization films |
| Zdroj: | Macromolecules, 36(19), 7035-7044 Macromolecules 36 (2003) 19 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma030353t |
| Popis: | The formation of soluble reversible coordination polymers with Zn2+ ions in aqueous solution was studied for two bifunctional ligands, differing in spacer length. Viscosity measurements were used to follow the formation of polymers as a function of the ratio between metal ions and ligands, the total ligand concentration, and the temperature. All the experimental findings could be reproduced and interpreted with a theoretical model that accounts for the formation of chains and rings. At low concentrations and at a 1:1 metal-to-ligand ratio, a large fraction of the ligand monomers are incorporated in small rings, with a small contribution to the viscosity. Rings are less important at higher concentrations or if one of the two components is in excess. The fraction of monomers in chains and rings could be estimated from 1H NMR measurements, which were in good agreement with the model predictions. With increasing temperature, the fraction of monomers in rings decreases. As a result, the reduced viscosity increases with increasing temperature |
| Databáze: | OpenAIRE |
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