title: Improved slow magnetic relaxation in optically pure helicene-based DyIIIsingle molecule magnets.
abstract: Racemic and optically pure [Dy(hfac)3(L)] complexes with L = 3-(2-pyridyl)-4-aza[6]-helicene have been synthesized and characterized. Both the racemic and enantiopure forms behave as single molecule magnets in their crystalline phase, while electronic circular dichroism activity is evidenced. Ab initio calculations on isolated complexes followed by the determination of intermolecular dipolar couplings allowed the rationalization of the different low-temperature magnetic behaviours. The enantiopure SMM differs from the racemic one by the presence of a hysteresis loop in the former system.
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: J-K
authors.initials: JK
authors.lastname: Ou-Yang
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: N
authors.initials: N
authors.lastname: Saleh
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr and Department of Chemistry "Ugo Schiff" and INSTM RU, University of Florence, 50019 Sesto Fiorentino, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Fernandez Garcia
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: L
authors.initials: L
authors.lastname: Norel
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: F
authors.initials: F
authors.lastname: Pointillart
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: T
authors.initials: T
authors.lastname: Guizouarn
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: O
authors.initials: O
authors.lastname: Cador
authors.affiliation: Department of Chemistry "Ugo Schiff" and INSTM RU, University of Florence, 50019 Sesto Fiorentino, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Totti
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: L
authors.initials: L
authors.lastname: Ouahab
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: J
authors.initials: J
authors.lastname: Crassous
authors.affiliation: Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France. fabrice.pointillart@univ-rennes1.fr jeanne.crassous@univ-rennes1.fr boris.leguennic@univ-rennes1.fr.
authors.forename: B
authors.initials: B
authors.lastname: Le Guennic
mesh_terms: D018360:Crystallography, X-Ray; D004419:Dysprosium / Q000737:chemistry*; D008280:Magnetics; D011083:Polycyclic Compounds / Q000737:chemistry*; D011789:Quantum Theory
chemical_list: D011083:Polycyclic Compounds; C031660:helicenes; D004419:Dysprosium