2019
DOI: 10.2478/jee-2019-0048
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NMR study of Au/Al nanosytems in solution

Abstract: Nuclear magnetic resonance spectroscopy (NMR) 1H, 35Cl, 27Al and 13C was applied to study underlying processes at the various stages of the synthesis of Au/Al nanoparticles. 35Cl spectrum was downfield shifted by 2.6 ppm as to the reference signal of the hydrated Cl− ion in NaCl solution. The evolution of the NMR spectra points to the formation of the stabilized shell around the gold containing nucleus. The shell restricts the supply of the reducing agents, which is the condition for the formation of Au2+ stat… Show more

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Cited by 2 publications
(3 citation statements)
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“…As ferrocenium ions are generally EPR-silent at room temperature, the broad resonances are assigned to different paramagnetic species generated from the initially formed ferrocenium cations [L] •+ , [M R ] •+ , [4a] •+ , and [4b] •+ . , A slow intramolecular electron transfer (valence isomerization) from gold­(I) to iron­(III) had been suggested resulting in a gold­(II)/iron­(II) character of the paramagnetic EPR-active species. , As ferrocene possesses a diamagnetic low-spin iron­(II) ion, the unpaired electron is essentially localized at the gold center. We note that complexes 1–3 do not furnish any detectable X-band EPR resonances after oxidation with Magic Blue initially to the reactive and unstable radical cations [1] •+ –[3] •+ suggesting that the gold nanoparticles formed after oxidation of 1–3 are EPR-silent. , …”
Section: Results and Discussionmentioning
confidence: 89%
“…As ferrocenium ions are generally EPR-silent at room temperature, the broad resonances are assigned to different paramagnetic species generated from the initially formed ferrocenium cations [L] •+ , [M R ] •+ , [4a] •+ , and [4b] •+ . , A slow intramolecular electron transfer (valence isomerization) from gold­(I) to iron­(III) had been suggested resulting in a gold­(II)/iron­(II) character of the paramagnetic EPR-active species. , As ferrocene possesses a diamagnetic low-spin iron­(II) ion, the unpaired electron is essentially localized at the gold center. We note that complexes 1–3 do not furnish any detectable X-band EPR resonances after oxidation with Magic Blue initially to the reactive and unstable radical cations [1] •+ –[3] •+ suggesting that the gold nanoparticles formed after oxidation of 1–3 are EPR-silent. , …”
Section: Results and Discussionmentioning
confidence: 89%
“…g * 0 calculated as g * 0 = (2g ⊥ + g )/3 . The reduction of gold ions in the system of aluminum oxohydrate-tannin-citrate causes paramagnetic proper-ties revealed in the EPR spectra as four various signals with g -factor values 2.17, 2.062, 2.0048 and g < 2 , which indicates the presence of, respectively, ions of twovalent gold, gold-containing clusters with odd number of atoms, radicals in the supporting matrix and various radical forms produced by the interaction of non-completely reduced ions of gold (single charged) with the matrix atoms [23]. Figure 4 shows first three features originating from the stoichiometric reduction process with further centrifugal extraction.…”
Section: Semmentioning
confidence: 99%
“…Au/Al nanocomplex was synthesized by co-reduction method [22] modified according to peculiarities of the redox processes [23]. A water solution of the chlorine containing compounds of Au and Al (HAuCl 4 and AlCl 3 ) was used as a precursor ("metal containing solution").…”
Section: Nanospecies In the Labile Matrix With Oxyhydrate Molecular Mmentioning
confidence: 99%