English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/148582
COMPARTIR / IMPACTO:
Estadísticas
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:
Título

Dynamics of intramolecular spin exchange interaction of a nitronyl nitroxide diradical in solution and on surfaces

AutorLloveras, Vega ; Badetti, Elena ; Veciana, Jaume ; Vidal Gancedo, José
Palabras claveSelf-assembled monolayers
Electron-paramagnetic-resonance
Labeled Au nanoparticles
Gold nanoparticles
Magnetic-properties
Ferromagnetic interactions
EPR spectroscopy
Free-radicals
Organometallic coupler
Aminoxyl radicals
Fecha de publicación7-mar-2016
EditorRoyal Society of Chemistry (Great Britain)
CitaciónNanoscale 8 (9): 5049-5058 (2016)
ResumenIn this paper we report the study of the dynamics of a thermally modulated intramolecular spin exchange interaction of a novel diradical nitronyl nitroxide-substituted disulfide in solution and when it is grafted on a gold surface. The structure of this diradical was designed to have flexible chains leading to intramolecular collisions and hence spin exchange interaction, and with an appropriate binding group to be grafted on the gold surface to study its behavior on the surface. In solution, this diradical shows a strong spin exchange interaction between both radicals which is modulated by temperature, but also gold nanoparticles (AuNPs) functionalized with this diradical permit investigation of such a phenomenon in surface-grafted radicals. The spin-labelled AuNP synthesis was optimized to obtain high coverage of spin labels to lead to high spin exchange interaction. The obtained AuNPs were studied by Electron Paramagnetic Resonance (EPR), UV-Vis, and IR spectroscopies, HR-TEM microscopy, Cyclic Voltammetry (CV), Energy Dispersive X-ray analysis (EDX) and Thermogravimetric Analysis (TGA). This inorganic–organic hybrid material also showed dipolar interactions between its radicals which were confirmed by the appearance in the EPR spectra of an |Δms| = 2 transition at half-field. This signal gives direct evidence of the presence of a high-spin state and permitted us to study the nature of the magnetic coupling between the spins which was found to be antiferromagnetic. Self-Assembled Monolayers (SAMs) of these radicals on the Au (111) substrate were also prepared and studied by contact angle, X-Ray Photoelectron Spectroscopy (XPS), Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS), Cyclic Voltammetry and EPR. The magnetic as well as the electrochemical properties of the hybrid surfaces were studied and compared with the properties of this diradical in solution. Analogies between the properties of AuNPs with high coverage of radicals and those of SAM were observed.
Versión del editorhttp://dx.doi.org/10.1039/C5NR08824K
URIhttp://hdl.handle.net/10261/148582
DOI10.1039/C5NR08824K
ISSN2040-3364
Aparece en las colecciones: (ICMAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Lloveras_Nanosc_2016_postprint.pdf781,4 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 

Artículos relacionados:


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.