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| 001 | 893912 | ||
| 005 | 20210810182025.0 | ||
| 024 | 7 | _ | |a 10.1021/acs.jpcb.1c02512 |2 doi |
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| 100 | 1 | _ | |a Wetzel, Oliver |0 P:(DE-HGF)0 |b 0 |
| 245 | _ | _ | |a Metal–Ligand Interface and Internal Structure of Ultrasmall Silver Nanoparticles (2 nm) |
| 260 | _ | _ | |a Washington, DC |c 2021 |b Soc. |
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| 520 | _ | _ | |a Ultrasmall silver nanoparticles were prepared by reduction with NaBH4 and surface-terminated with glutathione (GSH). The particles had a solid core diameter of 2 nm as shown by transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS). NMR-DOSY gave a hydrodynamic diameter of 2 to 2.8 nm. X-ray photoelectron spectroscopy (XPS) showed that silver is bound to the thiol group of the central cysteine in glutathione under partial oxidation to silver(+I). In turn, the thiol group is deprotonated to thiolate. X-ray powder diffraction (XRD) together with Rietveld refinement confirmed a twinned (polycrystalline) fcc structure of ultrasmall silver nanoparticles with a lattice compression of about 0.9% compared to bulk silver metal. By NMR spectroscopy, the interaction between the glutathione ligand and the silver surface was analyzed, also with 13C-labeled glutathione. The adsorbed glutathione is fully intact and binds to the silver surface via cysteine. In situ1H NMR spectroscopy up to 85 °C in dispersion showed that the glutathione ligand did not detach from the surface of the silver nanoparticle, i.e. the silver–sulfur bond is remarkably strong. The ultrasmall nanoparticles had a higher cytotoxicity than bigger particles in in vitro cell culture with HeLa cells with a cytotoxic concentration of about 1 μg mL–1 after 24 h incubation. The overall stoichiometry of the nanoparticles was about Ag∼250GSH∼155. |
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| 700 | 1 | _ | |a Hosseini, Shabnam |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Loza, Kateryna |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a Heggen, Marc |0 P:(DE-Juel1)130695 |b 3 |
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| 700 | 1 | _ | |a Bayer, Peter |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Beuck, Christine |0 P:(DE-HGF)0 |b 6 |
| 700 | 1 | _ | |a Schaller, Torsten |0 P:(DE-HGF)0 |b 7 |
| 700 | 1 | _ | |a Niemeyer, Felix |0 P:(DE-HGF)0 |b 8 |
| 700 | 1 | _ | |a Weidenthaler, Claudia |0 P:(DE-HGF)0 |b 9 |
| 700 | 1 | _ | |a Epple, Matthias |0 0000-0002-1641-7068 |b 10 |e Corresponding author |
| 773 | _ | _ | |a 10.1021/acs.jpcb.1c02512 |g Vol. 125, no. 21, p. 5645 - 5659 |0 PERI:(DE-600)2006039-7 |n 21 |p 5645 - 5659 |t The journal of physical chemistry |v 125 |y 2021 |x 1520-5207 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/893912/files/acs.jpcb.1c02512.pdf |
| 856 | 4 | _ | |y Published on 2021-05-24. Available in OpenAccess from 2022-05-24. |u https://juser.fz-juelich.de/record/893912/files/2021%20Metal-ligand%20interface%20and%20internal%20structure.pdf |
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