title: Linked Nickel Metallacrowns from a Phosphonate/2-Pyridyloximate Blend of Ligands: Structure and Magnetic Properties.
abstract: In the present work, four new Ni(II) clusters with nuclearities ranging between Ni4 and Na2Ni8 were synthesized, employing the versatile ligand phenylphosphonate and 6-methylpyridylaldoximate as the coligand. Crystallographic data show that the tetranuclear complex [Ni4(6-MepaoH)4(PhPO3)2(OH)2(MeOH)4](OH)2 (1) consists of two dimers linked by phosphonate bridges, whereas [Cs2Ni6(6-Mepao)6(PhPO3)3(OH)2(H2O)8] (2), Cs[Ni8(6-MepaoH)6(6-Mepao)6(PhPO3)3](ClO4)5 (3), and [Ni8Na2(BzO)6(6-Mepao)6(PhPO3)3] (4) are built from phosphonato-linked {Ni3(6-Mepao)3} metallacycles. The [9-MC(Ni(II)(6-Mepao))-3] fragments in 2-4 show the unusual coordination of additional Cs(+), Na(+), and/or Ni(II) cations. Direct-current magnetic measurements were carried in the 300-2 K range. Analysis of the experimental data revealed a complex response with strong antiferromagnetic interactions mediated by the oximato bridges and weak interactions mediated by the phosphonate ones.
authors.affiliation: Departament de Química Inorgànica and Institut of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona , Avenida Diagonal 645, Barcelona 08028, Spain.
authors.forename: Albert
authors.initials: A
authors.lastname: Escuer
authors.affiliation: Departament de Química Inorgànica and Institut of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona , Avenida Diagonal 645, Barcelona 08028, Spain.
authors.forename: Júlia
authors.initials: J
authors.lastname: Mayans
authors.affiliation: Departament de Mineralogia, Cristallografia i Dipòsits Minerals and Unitat de Difracció de R-X, Centre Científic i Tecnològic de la Universitat de Barcelona , Martí Franqués s/n, 08028 Barcelona, Spain.
authors.forename: Mercè
authors.initials: M
authors.lastname: Font-Bardia