5 results on '"Mauro Perfetti"'
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2. Diamondoid Structure in a Metal-Organic Framework of Fe4Single-Molecule Magnets
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Lorenzo Sorace, Mauro Perfetti, Andrea Nava, Roberta Sessoli, Yanhua Lan, Carri Cotton, Wolfgang Wernsdorfer, Anne-Laure Barra, Heinrich Lang, Andrea Cornia, Tobias Rüffer, Luca Rigamonti, Institut für Chemie, der TU Chemnitz, Institut für Chemie, Lehrstuhl für Anorganische Chemie, Technische Universität Chemnitz, Institut für Physikalische Chemie, Universität Stuttgart [Stuttgart], Dipartimento di Chimica, Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI)-Italian Interuniversity Consortium on Materials Science and Technology, Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G ), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut für Anorganische Chemie, Geeorg-August Universität, Circuits électroniques quantiques Alpes (QuantECA ), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Department of Chemistry 'Ugo Schiff', Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI), and Institut für Chemie
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[PHYS]Physics [physics] ,Spin states ,010405 organic chemistry ,Chemistry ,Stereochemistry ,Organic Chemistry ,cluster compounds ,iron ,magnetic properties ,metal–organic frameworks ,torque magnetometry ,Chemistry (all) ,General Chemistry ,Crystal structure ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Magnetic anisotropy ,Crystallography ,Magnetization ,Magnet ,Molecule ,Metal-organic framework ,Anisotropy ,ComputingMilieux_MISCELLANEOUS - Abstract
A 3D metal-organic framework (MOF) having single-molecule magnet (SMM) linkers was prepared in crystalline form by using a tetrairon(III) complex functionalised with two divergent pyridyl groups, namely [Fe4 (pPy)2 (dpm)6 ] (1; H3 pPy=2-(hydroxymethyl)-2-(pyridin-4-yl)propane-1,3-diol, Hdpm=dipivaloylmethane). Reaction of 1 with silver(I) perchlorate afforded {[Fe4 (pPy)2 (dpm)6 ]2 Ag}ClO4 (2), which crystallises in a cubic face-centred lattice and exhibits two interlocked diamondoid networks. In 2, the SMMs act as linear ditopic synthons, and silver(I) ions as tetrahedral nodes coordinated by four pyridyl nitrogen atoms. The magnetic properties of 1 (S=5 and D≈-0.4 cm(-1) in the ground spin state) are largely preserved in 2, which shows slow magnetic relaxation with an anisotropy barrier of Ueff /kB =11.46(10) K in zero field and 14.25(8) K in an applied field of 1 kOe. However, crystal symmetry triggers highly noncollinear magnetic anisotropy contributions oriented at 109.47° from each other along the threefold axes of AgN4 tetrahedra, a unique scenario fully confirmed by a single-crystal cantilever torque magnetometry investigation. Magnetisation curves down to 0.03 K demonstrated the occurrence of a wide hysteresis loop when the magnetic field was swept along one of the four Ag-N bonds. By symmetry, the crystalline compound can then be persistently magnetised parallel or antiparallel to the four main diagonals of the unit cell, although the crystals have no overall second-order anisotropy.
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- 2016
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3. Angular‐Resolved Magnetometry Beyond Triclinic Crystals Part II: Torque Magnetometry of Cp*ErCOT Single‐Molecule Magnets
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Fadi El Hallak, Mauro Perfetti, Roberta Sessoli, Giuseppe Cucinotta, Song Gao, and Marie-Emmanuelle Boulon
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Condensed matter physics ,Magnetometer ,Chemistry ,Organic Chemistry ,General Chemistry ,Triclinic crystal system ,Magnetic hysteresis ,Catalysis ,law.invention ,Crystal ,Crystallography ,Magnetic anisotropy ,law ,Condensed Matter::Superconductivity ,Magnet ,Orthorhombic crystal system ,Anisotropy - Abstract
The experimental investigation of the molecular magnetic anisotropy in crystals in which the magnetic centers are symmetry related, but do not have a parallel orientation has been approached by using torque magnetometry. A single crystal of the orthorhombic organometallic Cp*ErCOT [Cp*=pentamethylcyclopentadiene anion (C5Me5(-)); COT=cyclooctatetraenedianion (C8H8(2-))] single-molecule magnet, characterized by the presence of two nonparallel families of molecules in the crystal, has been investigated above its blocking temperature. The results confirm an Ising-type anisotropy with the easy direction pointing along the pseudosymmetry axis of the complex, as previously suggested by out-of-equilibrium angular-resolved magnetometry. The use of torque magnetometry, not requiring the presence of magnetic hysteresis, proves to be even more powerful for these purposes than standard single-crystal magnetometry. Furthermore, exploiting the sensitivity and versatility of this technique, magnetic anisotropy has been investigated up to 150 K, providing additional information on the crystal-field splitting of the ground J multiplet of the Er(III) ion.
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- 2014
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4. Frontispiece: Relaxation Dynamics and Magnetic Anisotropy in a Low-Symmetry DyIIIComplex
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Jean-Pierre Costes, Mauro Perfetti, Laure Vendier, Lorenzo Sorace, Matteo Briganti, Federico Totti, Eva Lucaccini, and Roberta Sessoli
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Lanthanide ,Magnetic anisotropy ,Nuclear magnetic resonance ,Condensed matter physics ,Chemistry ,Ab initio quantum chemistry methods ,Organic Chemistry ,Dynamics (mechanics) ,Relaxation (physics) ,General Chemistry ,Low symmetry ,Catalysis - Published
- 2016
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5. Magnetic Anisotropy and Spin-Parity Effect Along the Series of Lanthanide Complexes with DOTA
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Olivier Cador, Javier Luzon, Guillaume Calvez, Marie-Emmanuelle Boulon, Roberta Sessoli, Alessio Milanesi, MAURO PERFETTI, GIUSEPPE CUCINOTTA, Kevin Bernot, Andrea Caneschi, Department of Chemistry 'Ugo Schiff', Università degli Studi di Firenze = University of Florence [Firenze] (UNIFI), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Italian MIUR, Spanish research project, Région Bretagne, Rennes Métropole [MAT2011-27233-C02-02], Italian CINECA [HP10AI85MB], European Project, Università degli Studi di Firenze = University of Florence (UniFI), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), European Commission, Ministero dell'Istruzione, dell'Università e della Ricerca, European Research Council, and Région Bretagne
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Lanthanide ,Luminescence ,[CHIM.INOR]Chemical Sciences/Inorganic chemistry ,010402 general chemistry ,01 natural sciences ,Catalysis ,Ion ,Magnetization ,chemistry.chemical_compound ,Nuclear magnetic resonance ,Lanthanides ,luminescence ,Molecule ,DOTA ,lanthanides ,Spin (physics) ,Crystal field ,crystal field ,010405 organic chemistry ,Chemistry ,Relaxation (NMR) ,General Medicine ,General Chemistry ,ab initio calculations ,0104 chemical sciences ,3. Good health ,Crystallography ,Magnetic anisotropy ,Magnetic properti ,magnetic properties - Abstract
Spotting trends: Upon going from TbIII to YbIII centers in the complexes of the DOTA4- ligand, a reorientation of the easy axis of magnetization from perpendicular to parallel to the Ln-O bond of the apical water molecule is experimentally observed and theoretically predicted (see picture; SMM = single-molecule magnet). Only ions with an odd number of electrons show slow relaxation of the magnetization. © 2013 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim., This work was supported by the European Research Council through the AdG “NoINanoMaS” (grant number 267746), by the Italian MIUR (PRIN 2008), Spanish research project MAT2011-27233-C02-02, Région Bretagne, Rennes Métropole, and by the Italian CINECA through the award number HP10AI85MB, 2011.
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- 2012
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