Hydrothermal Synthesis, Structural Characterization and Magnetic Studies of the New Pillared Microporous Ammonium Fe(III) carboxyethylphosphonate: [NH4][Fe2(OH){O3P(CH2)2CO2}] (Articolo in rivista)

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  • Hydrothermal Synthesis, Structural Characterization and Magnetic Studies of the New Pillared Microporous Ammonium Fe(III) carboxyethylphosphonate: [NH4][Fe2(OH){O3P(CH2)2CO2}] (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.jssc.2004.10.047 (literal)
Alternative label
  • Anillo A., Altomare A., Moliterni A.G.G., Bauer E.M., Bellitto C., Colapietro M., Portalone G., Righini G. (2005)
    Hydrothermal Synthesis, Structural Characterization and Magnetic Studies of the New Pillared Microporous Ammonium Fe(III) carboxyethylphosphonate: [NH4][Fe2(OH){O3P(CH2)2CO2}]
    in Journal of solid state chemistry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Anillo A., Altomare A., Moliterni A.G.G., Bauer E.M., Bellitto C., Colapietro M., Portalone G., Righini G. (literal)
Pagina inizio
  • 306 (literal)
Pagina fine
  • 313 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 178 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • http://dx.doi.org/10.1016/j.jssc.2004.10.047 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1- Dept. de Quimica Organica e Inorganica, Univ. de Oviedo, Spain 2- CNR-IC, Sede di Bari 3- CNR-ISM, Sezione di Monterotondo-Roma 4- Dip. di Chimica, Univ. di Roma \"La Sapienza\" (literal)
Titolo
  • Hydrothermal Synthesis, Structural Characterization and Magnetic Studies of the New Pillared Microporous Ammonium Fe(III) carboxyethylphosphonate: [NH4][Fe2(OH){O3P(CH2)2CO2}] (literal)
Abstract
  • The preparation by hydrothermal reaction and the crystal structure of the iron(III) carboxyethylphosphonate of formula [NH4][Fe2(OH){O3P(CH2)2CO2}2] is reported. The green-yellow compound crystallizes in the monoclinic system, space group Pc(n.7), with the following unit-cell parameters: a=7.193(3) Å, b=9.776(3) Å, c=10.17(4) Å and b=94.3(2)°. It shows a typical layered hybrid organic–inorganic structure featuring an alternation of organic and inorganic layers along the a-axis of the unit cell. The bifunctional ligand [O3P(CH2)2CO2]3- is deprotonated and acts as a linker between adjacent inorganic layers, to form pillars along the a-axis. The inorganic layers are made up of dinuclear Fe(III) units, formed by coordination of the metal ions with the oxygen atoms originating from the [O3P-]2- end of the carboxyethylphosphonate molecules, the oxygen atoms of the [-CO2]- end group of a ligand belonging to the adjacent layer and the oxygen atom of the bridged OH group. Each Fe(III) ion is six-coordinated in a very distorted octahedral environment. Within the dimer the Fe–Fe separation is found to be 3.5 Å, and the angle inside the [Fe(1)–O(11)–Fe(2)] dimers is 124°. The resulting 3D framework contains micropores delimited by four adjacent dimers in the (bc) planes of the unit cell. These holes develop along the a-direction as tunnel-like pores and [NH4]+ cations are located there. The presence of the m-hydroxo-bridged [Fe(1)–O(11)–Fe(2)] dimers in the lattice is also responsible for the magnetic behavior of the compound at low temperatures. The compound contains Fe3+ ions in the high-spin state and the two Fe(III) ions are antiferromagnetic coupled. The J/k value of -16.3 K is similar to those found for other m-hydroxo-bridged Fe(III) dimeric systems having the same geometry. (literal)
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