Dante Gatteschi

University of Florence, Florens, Tuscany, Italy

Are you Dante Gatteschi?

Claim your profile

Publications (649)3108.28 Total impact

  • Lorenzo Sorace, Dante Gatteschi
    Lanthanides and Actinides in Molecular Magnetism, http://www.wiley-vch.de/books/sample/3527335269_c01.pdf 03/2015: pages 1-25; Wiley-VCH.
  • Andrea Caneschi, Dante Gatteschi, Federico Totti
    [Show abstract] [Hide abstract]
    ABSTRACT: A survey about the characterization of Molecular Magnets adsorbed on surfaces by density functional methods studied in our laboratory is presented. Several computational issues afflict the description of the different players involved and, therefore, a discriminating analysis of the single players, first, and the scenario in which they interact, afterwards, is presented. An assessment of the applicable computational protocols describing the evolution of the magnetic properties of some molecular magnets from the bulk to the surface adsorbed scenario are presented. The limits of the approaches and their applicability are also discussed. In the framework proposed, the role of the surface and its effects on the geometry and the magnetic properties on the adsorbed molecular magnets is enlightened
    Coordination Chemistry Reviews 01/2015; 289-290. DOI:10.1016/j.ccr.2014.11.016 · 12.10 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The selective replacement of the central iron(III) ion with vanadium(III) in a tetrairon(III) propeller-shaped single-molecule magnet has allowed us to increase the ground spin state from S=5 to S=13/2. As a consequence of the pronounced anisotropy of vanadium(III), the blocking temperature for the magnetization has doubled. Moreover, a significant remnant magnetization, practically absent in the parent homometallic molecule, has been achieved owing to the suppression of zero-field tunneling of the magnetization for the half-integer molecular spin. Interestingly, the contribution of vanadium(III) to the magnetic anisotropy barrier occurs through the anisotropic exchange interaction with iron(III) spins and not through single ion anisotropy as in most single-molecule magnets.
    Chemistry - A European Journal 10/2014; 20(42). DOI:10.1002/chem.201403361 · 5.70 Impact Factor
  • Karin Goss, Dante Gatteschi, Lapo Bogani
    [Show abstract] [Hide abstract]
    ABSTRACT: Molecular magnetism is considered an area where magnetic phenomena that are usually difficult to demonstrate can emerge with particular clarity. Over the years, however, less understandable systems have appeared in the literature of molecular magnetic materials, in some cases showing features that hint at the spontaneous emergence of global structures out of local interactions. This ingredient is typical of a wider class of problems, called complex behaviours, where the theory of complexity is currently being developed. In this perspective we wish to focus our attention on these systems and the underlying problematic that they highlight. We particularly highlight the emergence of the signatures of complexity in several molecular magnetic systems, which may provide unexplored opportunities for physical and chemical investigations
    Physical Chemistry Chemical Physics 07/2014; 16(34). DOI:10.1039/C4CP01413H · 4.20 Impact Factor
  • The British journal of ophthalmology 06/2014; 8385:438-447. · 2.81 Impact Factor
  • Lecture Notes in Computer Science 01/2014; 8385:418-427. · 0.51 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The quest for efficient ways of modulating localized surface plasmon resonance is one of the frontiers in current research in plasmonics; the use of a magnetic field as a source of modulation is among the most promising candidates for active plasmonics. Here we report the observation of magnetoplasmonic modes on colloidal gold nanoparticles detected by means of magnetic circular dichroism (MCD) spectroscopy and provide a model that is able to rationalize and reproduce the experiment with unprecedented qualitative and quantitative accuracy. We believe that the steep slope observed at the plasmon resonance in the MCD spectrum can be very efficient in detecting changes in the refractive index of the surrounding medium, and we give a simple proof of principle of its possible implementation for magnetoplasmonic refractometric sensing.
    Nano Letters 09/2013; 13(10). DOI:10.1021/nl402394p · 13.59 Impact Factor
  • Source
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Here we critically discuss the use of electron paramagnetic resonance (EPR) technique in the investigation of anion doped TiO2 based photocatalyst. Starting from a brief general overview of the potentiality of the EPR technique to investigate local properties of a given material, we used selected applications on the characterization of bare, C-, N-, B-, F-, and some anion co-doped TiO2 to highlight the power of this approach and to discuss its limitations and future challenges. In particular, we emphasize the need of other complementary techniques in addition to the EPR characterization, such as high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, and computational calculations.
    Catalysis Today 05/2013; 206:2–11. DOI:10.1016/j.cattod.2012.04.024 · 3.31 Impact Factor
  • Source
    Dante Gatteschi, Alessandro Vindigni
    [Show abstract] [Hide abstract]
    ABSTRACT: Single-chain magnets are molecular spin chains displaying slow relaxation of the magnetisation on a macroscopic time scale. To this similarity with single-molecule magnets they own their name. In this chapter the distinctive features of single-chain magnets as opposed to their precursors will be pinpointed. In particular, we will show how their behaviour is dictated by the physics of thermally-excited domain walls. The basic concepts needed to understand and model single-chain magnets will also be reviewed.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: BACKGROUND: The ferroxidase center of DNA-binding proteins from starved cells (Dps) is a major player in the iron oxidation/detoxification process that leads to a decreased reactive oxygen species production. The possible Mn(II) participation in this process has been studied in Dps from Kineococcus radiotolerans, a radiation-resistant bacterium with a high cytosolic Mn/Fe ratio and a high capacity to survive ionizing and stress conditions. METHODS: The X-ray structure of recombinant K. radiotolerans Dps loaded with Mn(II) has been solved at 2.0 Å resolution. Mn(II) binding to K. radiotolerans Dps and its effect on Fe(II) oxidation have been characterized in spectroscopic measurements. RESULTS: In K. radiotolerans Dps, the Fe-Fe ferroxidase center can have also a Mn-Fe composition. Mn(II) binds only at the high affinity, so-called A site, whereas Fe(II) binds also at the low affinity, so-called B site. The Mn-Fe and Fe-Fe centers behave distinctly upon iron oxidation by O(2). A site-bound Mn(II) or Fe(II) play a catalytic role, while B site-bound Fe(II) behaves like a substrate and can be replaced by another Fe(II) after oxidation. When H(2)O(2) is the Fe(II) oxidant, single electrons are transferred to aromatic residues near the ferroxidase center and give rise to intra-protein radicals thereby limiting OH(•) release in solution. The presence of the Mn-Fe center results in significant differences in the development of such intra-protein radicals. GENERAL SIGNIFICANCE: The results provide a likely molecular mechanism for the protective role of Mn(II) under oxidative stress conditions as it participates in redox cycling in the hetero-binuclear ferroxidase center.
    Biochimica et Biophysica Acta 02/2013; 1830(6). DOI:10.1016/j.bbagen.2013.02.003 · 4.66 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Chudnovsky and Garanin have attacked harshly our paper [1] in a comment in arXiv:cond-mat [2]. They write in their comment that “all formulas of Ref. [1] are incorrect”. They question “ how can ∆ be the magnetic dipole matrix element and the tunneling splitting at the same time?”. These two ∆ are obviously different and we write it explicitlely in the text: • The first ∆ appears in the expression of the fundamental doublet:
  • [Show abstract] [Hide abstract]
    ABSTRACT: Nitronyl nitroxides (NitR) are a family of persistent radicals widely used in molecular magnetism and recently suggested as potential candidates for spintronic applications. In this paper we characterize by X- and W- band Electron Paramagnetic Resonance (EPR) spectroscopy the new radical S-4-(nitronyl nitroxide) benzyl ethanethioate (NitSAc) designed for assembling on Au surfaces. We determined the radical magnetic tensors and studied by X-band pulse EPR its spin relaxation behaviour in fluid and glassy solutions of toluene. A comparison with the well known nitroxide 3-carbamoyl-2,2,5,5-tetramethyl-3-pyrrolin-1-oxyl (CTPO) is afforded. The advantages of using NitSAc in technological applications are discussed on the basis of the slow spin relaxation demonstrated by this study.
    Journal of Materials Chemistry 10/2012; 22(41):22272-22281. DOI:10.1039/C2JM35076A · 7.44 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The comparison of the structural and magnetic properties of molecular nanomagnets (MNM) and magnetic nanoparticles (MNP) can be instructive to get a deeper understanding of the magnetic behavior on the intermediate scale between molecular and bulk objects. In this respect iron oxo based clusters are particularly interesting, since they provide an increasing number of molecular systems with sizes close to that of iron oxide MNP. In this Minireview we report a survey of literature data aimed at improving our understanding of the emergence of MNP properties from MNM ones.
    Angewandte Chemie International Edition 05/2012; 51(20):4792-800. DOI:10.1002/anie.201105428 · 11.26 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Ein Vergleich der strukturellen und magnetischen Eigenschaften von molekularen Nanomagneten und magnetischen Nanopartikeln kann hilfreich sein, um ein tieferes Verständnis des magnetischen Verhaltens im Zwischenbereich zwischen molekularen und Bulkobjekten zu gewinnen. In dieser Hinsicht sind Eisen-Oxo-Cluster besonders interessant, weil hier eine Reihe von molekularen Systemen existiert, die der Größe von magnetischen Eisenoxid-Nanopartikeln nahekommen. In diesem Kurzaufsatz geben wir einen Überblick über Literaturdaten, mit dem Ziel, ein besseres Verständnis davon zu erlangen, wie die Eigenschaften molekularer Nanomagnete in magnetischen Nanopartikeln in Erscheinung treten und umgekehrt.
    Angewandte Chemie 05/2012; 124(20). DOI:10.1002/ange.201105428
  • [Show abstract] [Hide abstract]
    ABSTRACT: Highly versatile coordinating ligands are designed and synthesized with two β-diketonate groups linked at the carbon 3 through a phenyl ring. The rigid aromatic spacer is introduced in the molecules to orient the two acetylacetone units along different angles and coordination vectors. The resulting para, meta, and ortho bis-(3-acetylacetonate)benzene ligands show efficient chelating properties toward Cu(II) ions. In the presence of 2,2'-bipyridine, they promptly react and yield three dimers, 1, 2, and 3, with the bis-acetylacetonate unit in bridging position between two metal centers. X-ray single crystal diffraction shows that the compounds form supramolecular chains in the solid state because of intermolecular interactions. Each of the dinuclear complexes shows a magnetic behavior which is determined by the combination of structural parameters and spin polarization effects. Notably, the para derivative (1) displays a moderate antiferromagnetic coupling (J = -3.3 cm(-1)) along a remarkably long Cu···Cu distance (12.30 Å).
    Inorganic Chemistry 04/2012; 51(9):5409-16. DOI:10.1021/ic3003806 · 4.79 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We present a study of the structural, magnetic, and magneto-optical properties of a series of Co-substituted ferrite nanoparticles (NPs) prepared by thermal decomposition of metallo-organic precursors in high boiling solvents. The structural characterization, carried out by using several techniques (transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and magnetic circular dichroism measurements), showed all the samples are high crystalline, 5–6 nm spherical NPs with the cubic spinel structure typical of ferrites. The evolution of lattice parameters with cobalt content suggests that the material is Co-substituted maghemite, also confirmed by XAS and magneto optical (MO) characterizations. The investigation of the magnetic and magneto-optical properties displays peculiar trends with the cobalt content, the main features being the large increase of the saturation magnetization and the anomalous dependence of magnetic anisotropy which reaches its maximum values for intermediate compositions. The large tuneability of this material makes it possible to implement the performances of devices used in biomedical and sensing applications.
    The Journal of Physical Chemistry C 04/2012; 116(14):8261. DOI:10.1021/jp300806j · 4.84 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper we report on the characterization by continuous wave electron spin resonance spectroscopy (cw-ESR) of a nitronyl nitroxide radical in a nematic phase. A detailed analysis is performed by exploiting an innovative modeling strategy alternative to the usual spectral simulation approach: most of the molecular parameters needed to calculate the spectrum are evaluated a priori and the ESR spectrum is obtained by direct application of the stochastic Liouville equation. Allowing a limited set of fitting parameters it is possible to reproduce satisfactorily ESR spectra in the temperature range 260 K-340 K including the nematic-to-isotropic phase transition (325.1 K). Our results open the way to a more quantitative understanding of the ordering and mobility of nitronyl nitroxide radicals in nanostructured environments.
    Physical Chemistry Chemical Physics 02/2012; 14(9):3200-7. DOI:10.1039/c2cp23079h · 4.20 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We present a simple and cost-effective method for rendering networks of cellulose fibers, such as paper, fabrics or membranes, superparamagnetic by impregnating the individual fibers with a reactive acrylic monomer. The cellulose fibers are wetted by a cyanoacrylate monomer solution containing superparamagnetic manganese ferrite colloidal nanoparticles. Upon moisture initiated polymerization of the monomer on the fiber surfaces, a thin nanocomposite shell forms around each fiber. The nanocomposite coating renders the cellulose fibers water repellent and magnetically responsive. Magnetic and microscopy studies prove that the amount of the entrapped nanoparticles in the nanocomposite shell is fully controllable, and that the magnetic response is directly proportional to this amount. A broad range of applications can be envisioned for waterproof magnetic cellulose materials (such as magnetic paper/tissues) obtained by such a simple yet highly efficient method.
    Journal of Materials Chemistry 01/2012; 22(4):1662-66. DOI:10.1039/C1JM14755B · 7.44 Impact Factor
  • Source
    Journal of Materials Chemistry 01/2012; 22:1662. · 7.44 Impact Factor

Publication Stats

25k Citations
3,108.28 Total Impact Points

Institutions

  • 1972–2014
    • University of Florence
      • Dipartimento di Chimica "Ugo Schiff"
      Florens, Tuscany, Italy
  • 2010
    • Universität Stuttgart
      • Institute of Physical Chemistry
      Stuttgart, Baden-Württemberg, Germany
  • 1991–2010
    • Bielefeld University
      Bielefeld, North Rhine-Westphalia, Germany
  • 2000–2005
    • French National Centre for Scientific Research
      • • Institut Néel
      • • Laboratoire National des Champs Magnétiques Intenses
      Lutetia Parisorum, Île-de-France, France
    • University of Bristol
      • School of Chemistry
      Bristol, England, United Kingdom
  • 2001–2004
    • Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali
      Florens, Tuscany, Italy
  • 1993
    • Università della Calabria
      Rende, Calabria, Italy
  • 1988
    • Université Paris-Sud 11
      Orsay, Île-de-France, France