title: Magnetic and Electrochemical Properties of a TEMPO-Substituted Disulfide Diradical in Solution, in the Crystal, and on a Surface.
abstract: A study of the magnetic and electrochemical properties of a TEMPO-substituted disulfide diradical in three different environments was carried out: in solution, in the crystal, and as a self-assembled monolayer (SAM) on an Au(111) substrate, and the relationship between them was explored. In solution, this flexible diradical shows a strong spin-exchange interaction between the two nitroxide functions that depends on the temperature and solvent. Structural, dynamic, and thermodynamic information has been extracted from the EPR spectra of this dinitroxide. The magnetic interactions in the crystal include intra- and intermolecular contributions, which have been studied separately and shown to be antiferromagnetic in both cases. Finally, we demonstrate that both the magnetic and electrochemical properties are preserved upon chemisorption of the diradical on a gold surface. The resulting SAM displayed anisotropic magnetic properties, and angle-resolved EPR spectra of the monocrystal allowed a rough determination of the orientation of the molecules in the SAM.
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain.|CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax.
authors.forename: Vega
authors.initials: V
authors.lastname: Lloveras
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain.|CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax.
authors.forename: Elena
authors.initials: E
authors.lastname: Badetti
authors.affiliation: Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Center for Chemistry and Biomedicine, Innrain 80-82, 6020, Innsbruck, Austria.
authors.forename: Klaus
authors.initials: K
authors.lastname: Wurst
authors.affiliation: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
authors.forename: Victor
authors.initials: V
authors.lastname: Chechik
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain.|CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax.
authors.forename: Jaume
authors.initials: J
authors.lastname: Veciana
authors.affiliation: Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB s/n, 08193, Cerdanyola del Vallès, Spain. j.vidal@icmab.es.|CIBER de Bioingeniería, Biomateriales y Nanomedicina, CIBER-BBN), Barcelona, Spain), Fax. j.vidal@icmab.es.
authors.forename: José
authors.initials: J
authors.lastname: Vidal-Gancedo
keywords: EPR spectroscopy; X-ray diffraction; diradicals; intramolecular spin-exchange interaction; self-assembled monolayers