Reactivity of [Au25(SCH2CH2Ph)18]1− Nanoparticles with Metal Ions
| Autor: | Rebecca L. Stiles, Jai Pil Choi, Alicia D. Douglas, Christina A. Fields-Zinna, Royce W. Murray, Matthew C. Crowe, Ramjee Balasubramanian |
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| Rok vydání: | 2010 |
| Předmět: |
Isosbestic point
Titration curve Chemistry Metal ions in aqueous solution Inorganic chemistry Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal Absorbance General Energy visual_art visual_art.visual_art_medium Reactivity (chemistry) Qualitative inorganic analysis Titration Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 114:15890-15896 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp9101114 |
| Popis: | We report reactivity of the gold nanoparticle [TOA+] [Au25(SC2Ph)18]1− (TOA+ = tetraoctylammonium; SC2Ph = phenylethanethiolate = L; [Au25(SC2Ph)18]1− = Au25L181−) with Ag+, Cu2+, and Pb2+ ions. Titration of solutions of Au25L181− in CH2Cl2 with one and two equivalents of Ag+ produces changes in absorbance spectra with isosbestic points, and a titration curve break at 1:1 mol ratio, indicating a stoichiometric interaction. Similar effects are seen with Cu2+ and Pb2+ additions, but the break occurs at 0.5:1 mol ratio metal/nanoparticle. Changes in Au25L181− absorbance and fluorescence spectra are qualitatively similar to those accompanying oxidation of the Au25L181− nanoparticle anion, but the spectra of the stoichiometric products differ slightly according to the metal ion. Addition of higher excess of Ag+ or Cu2+ causes loss of characteristic [Au25(SC2Ph)18]1− UV−vis spectral fine structure and apparent irreversible refining into larger nanoparticles. Voltammetric currents for nanoparticle 0/-1 and +1/0 ... |
| Databáze: | OpenAIRE |
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