Hexaniobate Cluster Anion Monolayers on Gold Nanoparticles: A New Structural Role for Alkali Metal Countercations
| Autor: | Shelly Sharet Leiser, Manoj Raula, Gal Gan-Or, Libi Polin, Ira A. Weinstock |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tetramethylammonium
010405 organic chemistry Coordination polymer 010402 general chemistry Alkali metal 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Colloidal gold Stability constants of complexes Monolayer Cluster (physics) Physical and Theoretical Chemistry |
| Zdroj: | Inorganic Chemistry. 58:1012-1015 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/acs.inorgchem.8b03139 |
| Popis: | Monolayer shells of polyoxotungstate cluster anions on gold nanoparticles in water were electrostatically stabilized by structurally integrated countercations, with formation constants, K, increasing in the order: Li+ < Na+ < K+ < TMA+ < Cs+ (TMA+ = tetramethylammonium). We now report that for hexaniobate cluster anions, K values increase in the same order, with the notable exception of TMA+, which is effectively unable to induce monolayer formation. These findings point to a new structural model in which hexaniobate anions form a spherical coordination polymer at the gold surface with alkali metal countercations serving as single-atom structural building units between hexaniobate linkers. |
| Databáze: | OpenAIRE |
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