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5 results on '"Andrea Candini"'

1. Surface Investigation on Gd4M8(M = Zn, Ni) Single Molecule Coolers

Author

Alberto Ghirri, Umberto del Pennino, Marco Affronte, Edwige Otero, Valdis Corradini, Valentina De Renzi, Gianluca Dotti, Andrea Candini, Thomas N. Hooper, Roberto Biagi, Ross Inglis, and Euan K. Brechin

Subjects
X-ray absorption spectroscopy, Materials science, Magnetocaloric effects, Atomic force microscopy, Analytical chemistry, magnetocaloric effect, surface sciences, molecular materials, X-ray spectroscopies, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Biomaterials, Metal, Crystallography, X-ray photoelectron spectroscopy, visual_art, Electrochemistry, Magnetic refrigeration, visual_art.visual_art_medium, Molecule, Molecular magnetism
Abstract

Proving the preservation of functionality at the molecular scale is still a major challenge, both for the choice of suitable derivatives and protocols and for the employed experimental tools and methods. By using a combined scanning probe (AFM and STM) and spectroscopic methodology (XPS, XAS and XMCD), it is shown that Gd4M8 derivatives (with M = Zn2+, Ni2+) are robust molecular units which preserve their electronic, magnetic, and thermodynamic properties when deposited on a metallic surface. Namely, entropy variation ?S = [S(6 T) - S(0 T)] exceeding 8 R (20 J kg-1 K-1) at 4 K in isolated Gd4Ni8 molecules dispersed on Au(111) surface is measured and a viable route to exploit large magnetocaloric effect at single molecule level is shown.

Published
2014

2. Chemical Control of Spin Propagation between Heterometallic Rings

Author

George F. S. Whitehead, Thomas B. Faust, Eric J. L. McInnes, Andrea Candini, Floriana Tuna, John Machin, Wolfgang Wernsdorfer, Simon J. Teat, Laura Carthy, Richard E. P. Winpenny, Giulia Lorusso, V. Bellini, Christopher A. Muryn, David R. Allan, Harriott Nowell, Robin G. Pritchard, Stefano Carretta, Grigore A. Timco, Rebecca J. Docherty, David Collison, Jasbinder Kenyon, Marco Affronte, Institute of Nanosciences, Consiglio Nazionale delle Ricerche [Roma] (CNR), 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 Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), INFM and Dipartimento di Fisica, University of Parma = Università degli studi di Parma [Parme, Italie], School of Chemistry [Manchester], University of Manchester [Manchester], School of Chemistry and Photon Science Institute, CNR-INFM and Dipartimento di Fisica, Università di Modena e Reggio Emilia, CNR-INFM and Dipartimento di Fisica, and Photon Science Institute

Subjects
[PHYS]Physics [physics], Spintronics, Spins, 010405 organic chemistry, Chemistry, Organic Chemistry, Supramolecular chemistry, Aromaticity, General Chemistry, Quantum entanglement, 010402 general chemistry, 01 natural sciences, Inductive coupling, Catalysis, 0104 chemical sciences, 3. Good health, law.invention, supramolecular chemistry, magnetism theory and experiments, SINGLE-MOLECULE MAGNETS, COORDINATION POLYMERS, COMPLEXES, LIGANDS, DINUCLEAR, ANISOTROPY, CLUSTERS, EXCHANGE, COPPER(II), ABSORPTION, law, Chemical physics, Computational chemistry, Density functional theory, Electron paramagnetic resonance
Abstract

International audience; We present a synthetic, structural, theoretical, and spectroscopic study of a family of heterometallic ring dimers which have the formula [{Cr(7)NiF(3)(Etglu)(O(2)CtBu)(15)}(2)(NLN)], in which Etglu is the pentadeprotonated form of the sugar N-ethyl-d-glucamine, and NLN is an aromatic bridging diimine ligand. By varying NLN we are able to adjust the strength of the interaction between rings with the aim of understanding how to tune our system to achieve weak magnetic communication between the spins, a prerequisite for quantum entanglement. Micro-SQUID and EPR data reveal that the magnetic coupling between rings is partly related to the through-bond distance between the spin centers, but also depends on spin-polarization mechanisms and torsion angles between aromatic rings. Density functional theory (DFT) calculations allow us to make predictions of how such chemically variable parameters could be used to tune very precisely the interaction in such systems. For possible applications in quantum information processing and molecular spintronics, such precise control is essential.

Published
2011

3. Molecular Magnets: Deposition of Functionalized Cr7Ni Molecular Rings on Graphite from the Liquid Phase (Adv. Funct. Mater. 10/2010)

Author

Christopher A. Muryn, Valdis Corradini, Marco Affronte, Grigore A. Timco, Andrea Candini, Umberto del Pennino, Robin J. Pritchard, Christian Cervetti, Richard E. P. Winpenny, and Alberto Ghirri

Subjects
Biomaterials, Scanning probe microscopy, Materials science, Molecular magnets, Electrochemistry, Liquid phase, Deposition (phase transition), Self-assembled monolayer, Nanotechnology, Graphite, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
Published
2010

5. Cover Picture: Linking Rings through Diamines and Clusters: Exploring Synthetic Methods for Making Magnetic Quantum Gates (Angew. Chem. Int. Ed. 40/2005)

Author

Andrea Candini, Wolfgang Wernsdorfer, Simon J. Teat, Marco Affronte, Christopher A. Muryn, Stefano Carretta, Grigore A. Timco, Ian Casson, Marco Evangelisti, and Richard E. P. Winpenny

Subjects
Quantum gate, Chemistry, Supramolecular chemistry, Nanotechnology, Cover (algebra), General Chemistry, Catalysis, Quantum computer
Published
2005

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