title: Manganese clusters derived from a 2,6-diacetylpyridine dioximato ligand: structure and magnetic study.
abstract: Reactions of 2,6-diacetylpyridine dioxime (dapdoH₂) with Mn(NO₃)₂ or Mn(SO₃CF₃)₂ under a variety of conditions or co-ligands yield compounds with the formula [Mn₆O₂(OMe)₂(dapdo)₂(dapdoH)₄](X)₂ in which X = NO₃⁻ (1) or SO₃CF₃⁻ (2), [Mn₈O₂(dapdo)₆(NO₃)₂]·H₂O (3) and [Mn(dapdoH₂)(N₃)₂](n) (4). Compounds 1, 3 and 4 were structurally characterized and equivalent structures for 1 and 2 were inferred from spectroscopic and analytical results. Compounds 1 and 2 consist of hexanuclear Mn₂(II)Mn₄(III) complexes whereas 3 consists of an octanuclear Mn₆(II)Mn₂(III) cluster in which the manganese atoms exhibit a rare bicapped elongated octahedral topology. Compound 4 consists of a 1D system bridged by double end-on azido ligands. Variable temperature magnetic studies were performed between 2-300 K, confirming the ground state S = 5 for 1 and 2, S = 0 for 3 and ferromagnetic response for 4.
authors.affiliation: Departament de Química Inorgànica and Institut de Nanociència i Nanotecnologia de la Universitat de Barcelona (IN²UB), Martí i Franqués 1-11, 08028 Barcelona, Spain. albert.escuer@qi.ub.es
authors.forename: Albert
authors.initials: A
authors.lastname: Escuer
authors.forename: Beatriz
authors.initials: B
authors.lastname: Cordero
authors.forename: Mercé
authors.initials: M
authors.lastname: Font-Bardia
authors.forename: Teresa
authors.initials: T
authors.lastname: Calvet
authors.forename: Olivier
authors.initials: O
authors.lastname: Roubeau
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Teat
authors.forename: Serena
authors.initials: S
authors.lastname: Fedi
authors.forename: Fabrizia
authors.initials: F
authors.lastname: Fabrizi de Biani
mesh_terms: D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry; D018360:Crystallography, X-Ray; D055664:Electrochemical Techniques; D008024:Ligands; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D008968:Molecular Conformation; D010091:Oximes / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
chemical_list: D056831:Coordination Complexes; D008024:Ligands; D010091:Oximes; D011725:Pyridines; D008345:Manganese; C023666:pyridine