title: Enneanuclear [Ni6Ln3] Cages: [Ln(III)3] Triangles Capping [Ni(II)6] Trigonal Prisms Including a [Ni6Dy3] Single-Molecule Magnet.
abstract: The use of (2-(β-naphthalideneamino)-2-hydroxymethyl-1-propanol) ligand, H3L, in Ni/Ln chemistry has led to the isolation of three new isostructural [Ni(II)6Ln(III)3] metallic cages. More specifically, the reaction of Ni(ClO4)2·6H2O, the corresponding lanthanide nitrate salt, and H3L in MeCN, under solvothermal conditions in the presence of NEt3, led to the isolation of three complexes with the formulas [Ni6Gd3(OH)6(HL)6(NO3)3]·5.75MeCN·2Et2O·1.5H2O (1·5.75MeCN·2Et2O·1.5H2O), [Ni6Dy3(OH)6(HL)6(NO3)3]·2MeCN·2.7Et2O·2.4H2O (2·2MeCN·2.7Et2O·2.4H2O), and [Ni6Er3(OH)6(HL)6(NO3)3]·5.75MeCN·2Et2O·1.5H2O (3·5.75MeCN·2Et2O·1.5H2O). The structure of all three clusters describes a [Ln(III)3] triangle capping a [Ni(II)6] trigonal prism. Direct current magnetic susceptibility studies in the 5-300 K range for complexes 1-3 reveal the different nature of the magnetic interactions within the clusters: dominant antiferromagnetic exchange interactions for the Dy(III) and Er(III) analogues and dominant ferromagnetic interactions for the Gd(III) example. Alternating current magnetic susceptibility measurements under zero external dc field displayed fully formed temperature- and frequency-dependent out-of-phase peaks for the [Ni(II)6Dy(III)3] analogue, establishing its single molecule magnetism behavior with Ueff = 24 K.
authors.affiliation: †Department of Chemistry, The University of Crete, Voutes, 71003, Herakleion, Greece.
authors.forename: Angelos B
authors.initials: AB
authors.lastname: Canaj
authors.affiliation: ‡Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
authors.forename: Demetrios I
authors.initials: DI
authors.lastname: Tzimopoulos
authors.affiliation: §Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383, Wroclaw, Poland.
authors.forename: Milosz
authors.initials: M
authors.lastname: Siczek
authors.affiliation: §Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383, Wroclaw, Poland.
authors.forename: Tadeusz
authors.initials: T
authors.lastname: Lis
authors.affiliation: ∥School of Chemistry, The University of Edinburgh, David Brewster Road, EH9 3FJ Edinburgh, U.K.
authors.forename: Ross
authors.initials: R
authors.lastname: Inglis
authors.affiliation: †Department of Chemistry, The University of Crete, Voutes, 71003, Herakleion, Greece.
authors.forename: Constantinos J
authors.initials: CJ
authors.lastname: Milios