title: Effect of Ligand Field Tuning on the SMM Behavior for Three Related Alkoxide-Bridged Dysprosium Dimers.
abstract: The synthesis and characterization of three Dy2 compounds, [Dy2(HL1)2(NO3)4] (1), [Dy2(L2)2(NO3)4] (2), and [Dy2(HL3)2(NO3)4] (3), formed using related tripodal ligands with a central tertiary amine bearing picolyl and alkoxy arms, 2-[(2-hydroxy-ethyl)-pyridin-2-ylmethylamino]-ethanol (H2L1), 2-(bis-pyridin-2-ylmethylamino)-ethanol (HL2), and 2-(bis-pyridin-2-ylmethylamino)-propane-1,3-diol (H2L3), are reported. The compounds are rare examples of alkoxide-bridged {Dy2} complexes and display capped square antiprism coordination geometry around each Dy(III) ion. Changes in the ligand field environment around the Dy(III) ions brought about through variations in the ligand donors can be gauged from the magnetic properties, with compounds 1 and 2 showing antiparallel coupling between the Dy(III) ions and 3 showing parallel coupling. Furthermore, slow relaxation of the magnetization typical of SMM behavior could be observed for compounds 2 and 3, suggesting that small variations in the ligand field can have a significant influence on the slow relaxation processes responsible for SMM behavior of Dy(III)-based systems.
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology , Engesserstrasse 15, 76131 Karlsruhe, Germany.|Institute of Nanotechnology, Karlsruhe Institute of Technology , Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Yan
authors.initials: Y
authors.lastname: Peng
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology , Engesserstrasse 15, 76131 Karlsruhe, Germany.
authors.forename: Valeriu
authors.initials: V
authors.lastname: Mereacre
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology , Engesserstrasse 15, 76131 Karlsruhe, Germany.|Institute of Nanotechnology, Karlsruhe Institute of Technology , Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Amer
authors.initials: A
authors.lastname: Baniodeh
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology , Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Yanhua
authors.initials: Y
authors.lastname: Lan
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology , Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Schlageter
authors.affiliation: Institute of Nanotechnology, Karlsruhe Institute of Technology , Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: George E
authors.initials: GE
authors.lastname: Kostakis
authors.affiliation: Institute of Inorganic Chemistry, Karlsruhe Institute of Technology , Engesserstrasse 15, 76131 Karlsruhe, Germany.|Institute of Nanotechnology, Karlsruhe Institute of Technology , Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell