Ni(II)[1,4;5,8-Naphthalenediimide bis-phosphonate], [Ni2(ND-BP)]·4·H2O: an example of a magnetic organic-inorganic hybrid multifunctional system (Abstract/Poster in convegno)

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  • Ni(II)[1,4;5,8-Naphthalenediimide bis-phosphonate], [Ni2(ND-BP)]·4·H2O: an example of a magnetic organic-inorganic hybrid multifunctional system (Abstract/Poster in convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • C. Bellitto, E.M. Bauer and G. Righini (2006)
    Ni(II)[1,4;5,8-Naphthalenediimide bis-phosphonate], [Ni2(ND-BP)]·4·H2O: an example of a magnetic organic-inorganic hybrid multifunctional system
    in European Conference on Molecular Magnetism 2006, Tomar, Portugal, 10-15/10(2006
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • C. Bellitto, E.M. Bauer and G. Righini (literal)
Note
  • Poster (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Struttura della Materia - CNR, Monterotondo, Italia (literal)
Titolo
  • Ni(II)[1,4;5,8-Naphthalenediimide bis-phosphonate], [Ni2(ND-BP)]·4·H2O: an example of a magnetic organic-inorganic hybrid multifunctional system (literal)
Abstract
  • Organic-inorganic hybrids are interesting materials since the combination of an inorganic component with an organic one has the potential to provide more than one useful (physical and/or chemical) property from the resulting material. In order to obtain such a type of materials we have chosen as molecular building blocks: a) the functional RPO3H2 ligand, R=organic group and b) transition metal ions with unpaired spins. We recently have studied several multifunctional metal(II) and metal(III) organophosphonates and we have found examples of a polar weak ferromagnet [1] and a porous material [2]. Here we wish to present a new functional hybrid magnetic material based on bis-phosphonate ligand, containing the 1,4;5,8-naphthalene-diimide group as an R-group. The interest lies in the fact that the latter moiety belongs to a class of molecules with outstanding photochemical and electrochemical properties [3]. The synthesis of the title compound has been carried out by refluxing for few days the diphosphonate ligand with NiCl2 in water in the presence of urea in the molar ratio Ni: NDI-BP: urea =2:1:4. A beige powdered solid was isolated. Elemental analysis calculated for C18H20N2O14P2Ni2: C,32.38; H,3.02; N,4.19. Found: C,32.4; H,3.01; N,4.72. The X-ray powder diffraction pattern is characterized by a progression of few broad Bragg peaks, indicating that the solid is crystallized only on a small scale. The progression of diffraction peaks at low ?-angles can be indexed as (00l) reflections. These preliminary results suggest a layered structure with an interlayer distance of 17.6 Å. The IR data indicate the presence of a completely deprotonated ligand, thus suggesting a pillared structure. The magnetic characterization has been carried out by a SQUID magnetometer in the temperature range of 5 to 300 K. The 1/? vs. T plot is linear above T=80 K, thus obeying to the Curie-Weiss law. The deduced C-value per Ni(II) ion, i.e. 1.1964 cm3*K*mol-1, is in agreement with the expected value for Ni(II) d8(S=1) electronic configuration. The Weiss constant,?, is negative in value, i.e. ?=-19K, indicating nearest-neighbour antiferromagnetic interactions. Below T?20 K (see Figure) the compound resulted to be a weak-ferromagnet. References [1] C. Bellitto. et al., Inorg. Chem. 42, 634 (literal)
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