Effect of Core Size on the Partition of Organic Solutes in the Monolayer of Water-Soluble Nanoparticles:  An ESR Investigation

ESR spectroscopy has been used to study the interaction of para-pentylbenzyl hydroxyalkyl nitroxide with the monolayer of water-soluble protected gold clusters having a core diameter ranging from 1.6 to 5.3 nm. The solubilization of the nitroxide probe in the more hydrophobic environment of the mono...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2005-11, Vol.127 (47), p.16384-16385
Main Authors: Lucarini, Marco, Franchi, Paola, Pedulli, Gian Franco, Gentilini, Cristina, Polizzi, Stefano, Pengo, Paolo, Scrimin, Paolo, Pasquato, Lucia
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Physical and chemical studies. Granulometry. Electrokinetic phenomena
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Summary:ESR spectroscopy has been used to study the interaction of para-pentylbenzyl hydroxyalkyl nitroxide with the monolayer of water-soluble protected gold clusters having a core diameter ranging from 1.6 to 5.3 nm. The solubilization of the nitroxide probe in the more hydrophobic environment of the monolayer strongly depends on the size of the gold core. In particular, the partition equilibrium constant increases as the nanoparticle diameter decreases. These results have been attributed to the different packing of the chains in the monolayer resulting from the different radius of curvature of the investigated nanoparticles. This represents, to the best of our knowledge, the first report demonstrating that the core size of metallic nanoparticles affects the solvating properties of the protective organic monolayer.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja0560534