Weakly hydrated anions bind to polymers but not monomers in aqueous solutions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F22%3A43922692" target="_blank" >RIV/60461373:22340/22:43922692 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s41557-021-00805-z" target="_blank" >https://www.nature.com/articles/s41557-021-00805-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41557-021-00805-z" target="_blank" >10.1038/s41557-021-00805-z</a>

Result language
angličtina
Original language name
Weakly hydrated anions bind to polymers but not monomers in aqueous solutions
Original language description
Weakly hydrated anions solubilize macromolecules but cause small molecules that are made from identical chemical constituents to precipitate out of aqueous solutions. Now, this phenomenon has been understood by demonstrating that the binding of anions to polymers is regulated by molecular curvature and interfacial water structure. Weakly hydrated anions help to solubilize hydrophobic macromolecules in aqueous solutions, but small molecules comprising the same chemical constituents precipitate out when exposed to these ions. Here, this apparent contradiction is resolved by systematically investigating the interactions of NaSCN with polyethylene oxide oligomers and polymers of varying molecular weight. A combination of spectroscopic and computational results reveals that SCN- accumulates near the surface of polymers, but is excluded from monomers. This occurs because SCN- preferentially binds to the centre of macromolecular chains, where the local water hydrogen-bonding network is disrupted. These findings suggest a link between ion-specific effects and theories addressing how hydrophobic hydration is modulated by the size and shape of a hydrophobic entity.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10404 - Polymer science

Project
<a href="/en/project/GA20-24155S" target="_blank" >GA20-24155S: Insight in preferential interactions, bridging, and cononsolvency on PNIPAM by experimental and computational thermodynamics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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