title: Influencing the properties of dysprosium single-molecule magnets with phosphorus donor ligands.
abstract: Single-molecule magnets are a type of coordination compound that can retain magnetic information at low temperatures. Single-molecule magnets based on lanthanides have accounted for many important advances, including systems with very large energy barriers to reversal of the magnetization, and a di-terbium complex that displays magnetic hysteresis up to 14 K and shows strong coercivity. Ligand design is crucial for the development of new single-molecule magnets: organometallic chemistry presents possibilities for using unconventional ligands, particularly those with soft donor groups. Here we report dysprosium single-molecule magnets with neutral and anionic phosphorus donor ligands, and show that their properties change dramatically when varying the ligand from phosphine to phosphide to phosphinidene. A phosphide-ligated, trimetallic dysprosium single-molecule magnet relaxes via the second-excited Kramers' doublet, and, when doped into a diamagnetic matrix at the single-ion level, produces a large energy barrier of 256 cm(-1) and magnetic hysteresis up to 4.4 K.
authors.affiliation: School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: Thomas
authors.initials: T
authors.lastname: Pugh
authors.affiliation: 1] School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK [2] Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: Floriana
authors.initials: F
authors.lastname: Tuna
authors.affiliation: Division of Quantum and Physical Chemistry, Katholieke Universiteit Leuven, Celestijenlaan 200F, Leuven 3001, Belgium.
authors.forename: Liviu
authors.identifier: 0000000150154225
authors.initials: L
authors.lastname: Ungur
authors.affiliation: 1] School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK [2] Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: David
authors.initials: D
authors.lastname: Collison
authors.affiliation: 1] School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK [2] Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: Eric J L
authors.initials: EJ
authors.lastname: McInnes
authors.affiliation: Division of Quantum and Physical Chemistry, Katholieke Universiteit Leuven, Celestijenlaan 200F, Leuven 3001, Belgium.
authors.forename: Liviu F
authors.initials: LF
authors.lastname: Chibotaru
authors.affiliation: School of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Layfield