A5071471585- Magnetism in coordination complexes
- Lanthanide and Transition Metal Complexes
- Electron Spin Resonance Studies
- Metal complexes synthesis and properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Organic and Molecular Conductors Research
- Metal-Catalyzed Oxygenation Mechanisms
- Advanced NMR Techniques and Applications
- Porphyrin and Phthalocyanine Chemistry
- Polyoxometalates: Synthesis and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Crystallography and molecular interactions
- Molecular Junctions and Nanostructures
- Magnetic properties of thin films
- Organometallic Complex Synthesis and Catalysis
- Photochemistry and Electron Transfer Studies
- Molecular spectroscopy and chirality
- Inorganic and Organometallic Chemistry
- Physics of Superconductivity and Magnetism
- Crystal structures of chemical compounds
- Iron oxide chemistry and applications
- Quantum and electron transport phenomena
- Spectroscopy and Quantum Chemical Studies
- Nanocluster Synthesis and Applications
University of Florence
2010-2022
National Interuniversity Consortium of Materials Science and Technology
2010-2022
ETH Zurich
2013
University of Stuttgart
2009-2010
University of Modena and Reggio Emilia
1990-2009
Institut National des Sciences Appliquées de Rennes
2006-2009
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
2009
Chemnitz University of Technology
2008
Heinz Maier-Leibnitz Zentrum
2008
TU Dresden
2008
Molecules comprising a large number of coupled paramagnetic centers are attracting much interest because they may show properties which intermediate between those simple paramagnets and classical bulk magnets provide unambiguous evidence quantum size effects in magnets. To date, two cluster families, usually referred to as Mn12 Fe8, have been used test theories. However, it is reasonable predict that other classes molecules will be discovered similar or superior properties. do this necessary...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-spin molecules: [Mn12O12(O2CR)16(H2O)4]Roberta Sessoli, Hui Lien Tsai, Ann R. Schake, Sheyi Wang, John B. Vincent, Kirsten Folting, Dante Gatteschi, George Christou, and David N. HendricksonCite this: J. Am. Chem. Soc. 1993, 115, 5, 1804–1816Publication Date (Print):March 1, 1993Publication History Published online1 May 2002Published inissue 1 March...
Slow magnetic relaxation and hysteresis effects of dynamic origin have been observed above liquid helium temperature in a chain compound (see picture), comprising CoII centers organic radicals, without any evidence phase transition to three-dimensional order. These results are the first slow dynamics predicted for one-dimensional systems with Ising anisotropy, they open possibility storing information single nanowire.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlternating current susceptibility, high field magnetization, and millimeter band EPR evidence for a ground S = 10 state in [Mn12O12(Ch3COO)16(H2O)4].2CH3COOH.4H2OAndrea Caneschi, Dante Gatteschi, Roberta Sessoli, Anne Laure Barra, Louis Claude Brunel, Maurice GuillotCite this: J. Am. Chem. Soc. 1991, 113, 15, 5873–5874Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 July...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTToward molecular magnets: the metal-radical approachAndrea Caneschi, Dante Gatteschi, Roberta Sessoli, and Paul ReyCite this: Acc. Chem. Res. 1989, 22, 11, 392–398Publication Date (Print):November 1, 1989Publication History Published online1 May 2002Published inissue 1 November 1989https://pubs.acs.org/doi/10.1021/ar00167a004https://doi.org/10.1021/ar00167a004research-articleACS PublicationsRequest reuse permissionsArticle...
Clusters of metal ions are a class compounds actively investigated for their magnetic properties, which should gradually change from those simple paramagnets to bulk magnets. However, interest lies in number different disciplines: chemistry, seeks new synthetic strategies make larger and clusters controlled manner; physics, can test the validity quantum mechanical approaches at nanometer scale; biology, use them as models biomineralization particles.
We have investigated the magnetic relaxation of clusters eight iron ions characterized by a spin ground state ten and an Ising anisotropy. Below 400 mK rate is temperature independent suggesting that tunneling moment across its anisotropy energy barrier occurs. Using constants derived from EPR data, we can calculate both crossover ${T}_{c}$ expected frequency $1/\ensuremath{\tau}$. The field dependence shows evidence resonant tunneling.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of magnetic coupling in two complexes containing gadolinium(III) copper(II) ionsA. Bencini, C. Benelli, A. Caneschi, Richard L. Carlin, Dei, D. GatteschiCite this: J. Am. Chem. Soc. 1985, 107, 26, 8128–8136Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December...
The first family of rare-earth-based single chain magnets is presented. Compounds general formula [M(hfac)3(NITPhOPh)], where M = Eu, Gd, Tb, Dy, Ho, Er, or Yb, and PhOPh the nitronyl-nitroxide radical (2,4'-benzoxo-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), have been structurally characterized found to be isostructural. characterization both static dynamic magnetic properties whole reported. Ho compounds display slow relaxation magnetization, ac susceptibility shows a thermally...
Molecular magnetism , which includes the study of organic magnets, spin cross‐over, and large clusters, has recently begun to concentrate on design synthesis new magnetic compounds. Simple molecules, based nitroxides nitronyl (see Figure), have been found order ferromagnetically. The field is reviewed, stressing possibility combining properties. magnified image
The synthesis, crystal structure, and magnetic characterization of a novel tetranuclear iron(III) methoxo-bridged cluster formula Fe4(OCH3)6(dpm)6 (where Hdpm = dipivaloylmethane) is reported. has ground spin state S 5, which selectively populated below 20 K. High-field EPR spectra revealed that the system uniaxial anisotropy, corresponding to zero field splitting parameter D −0.2 cm-1 5. Such anisotropy 1 K gives rise slow relaxation magnetization similar super-paramagnets. To investigate...
Single-chain magnets: A rational approach to decrease magnetic dipolar interactions led the chain compound [Dy(hfac)3{NIT(C6H4OPh)}] (see structure; NIT(R): 2-(4′-R)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), first rare-earth-radical-based single-chain magnet. The shows slow relaxation behavior, a dynamical crossover resulting from finite-size effects, and very rich static behavior.
Using high-frequency EPR spectroscopy we have found that a cluster comprising eight iron(III) ions, Fe8, which is essentially flat, has ground S = 10 state and an Ising-type anisotropy. For the first time both ac susceptibility Mössbauer could be used in order to monitor relaxation of magnetization, was follow thermally activated behavior, as superparamagnet, with τ0 1.9 × 10−7 s energy barrier 22.2 K. The set data allowed us conclude origin anisotropy nanosize molecular clusters associated...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT[Fe(OMe)2(O2CCH2Cl)]10, a Molecular Ferric WheelKingsley L. Taft, Christopher D. Delfs, Georgia C. Papaefthymiou, Simon Foner, Dante Gatteschi, and Stephen J. LippardCite this: Am. Chem. Soc. 1994, 116, 3, 823–832Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/10.1021/ja00082a001https://doi.org/10.1021/ja00082a001research-articleACS PublicationsRequest...