Preparation and properties of lanthanide complexes with pyridine-2,6-dicarboxylic and thiophene-2,5-dicarboxylic acids. Crystal structure of diaqua-bis(dipicolinate)lanthanum(III) tetrahydrate (Articolo in rivista)

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  • Preparation and properties of lanthanide complexes with pyridine-2,6-dicarboxylic and thiophene-2,5-dicarboxylic acids. Crystal structure of diaqua-bis(dipicolinate)lanthanum(III) tetrahydrate (Articolo in rivista) (literal)
Anno
  • 1987-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/S0020-1693(00)87789-0 (literal)
Alternative label
  • Guerriero P.; Casellato U.; Sitran S.; Vigato P.A.; Graziani R. (1987)
    Preparation and properties of lanthanide complexes with pyridine-2,6-dicarboxylic and thiophene-2,5-dicarboxylic acids. Crystal structure of diaqua-bis(dipicolinate)lanthanum(III) tetrahydrate
    in Inorganica Chimica Acta (Testo stamp.); Elsevier BV, Amsterdam (Paesi Bassi)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Guerriero P.; Casellato U.; Sitran S.; Vigato P.A.; Graziani R. (literal)
Pagina inizio
  • 337 (literal)
Pagina fine
  • 345 (literal)
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  • http://www.sciencedirect.com/science/article/pii/S0020169300877890 (literal)
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  • 133 (literal)
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  • 9 (literal)
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  • 2 (literal)
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  • Scopu (literal)
  • Science direct - Elsevier (literal)
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  • 1-4 : Istituto di Chimica e Tecnologia dei Radioelementi, C.N.R., Corso Stati Uniti 4, 35020 Padua, Italy / 5 : Dipartimento di Chimica Inorganica, Metallorganica ed Analitica dell'U'niversita', 35100 Padua, Italy (literal)
Titolo
  • Preparation and properties of lanthanide complexes with pyridine-2,6-dicarboxylic and thiophene-2,5-dicarboxylic acids. Crystal structure of diaqua-bis(dipicolinate)lanthanum(III) tetrahydrate (literal)
Abstract
  • Lanthanum(III), gadolinium(III) and dysprosium- (III) complexes with pyridine-2,6-dicarboxylic acid (H2pdc) of composition Na3[Ln(pdc)3]·nH2O and Ln(pdc)(Hpdc)·mH2O (n = 5-10; m = 5-8) have been prepared by reaction of aqueous solutions of Ln(NO3)3·nH2O and H2pdc in the presence of NaOH and their physico-chemical properties studied. The thermal behaviour of Ln(pdc)(Hpdc)·mH2O has been investigated and the structure of La(pdc)(Hpdc)· 6H2O determined by X-ray crystallography. The compound is monoclinic, space group P21/c, with a = 14.120(5), b = 11.280(5), c = 13.038(5) Å, ? = 101.67(3)°, and Z = 4. Refincment of the structure based on the 3217 observed reflexions led to the final R of 0.026. The asymmetric complex unit comprises the nine-coordinate metal ion, two dipicolinato ligands and two coordinated water molecules. One dipicolinato group provides linkage with a carboxylate oxygen, allowing the formation of a polymeric chain. Selected bond distances are La?N 2.67 ) Å, La?O (water) 2.51 Å (mean), La?O (pdc) 2.55 Å (mean). The interaction of thiophene-2, 5-dicarboxylic acid (H2tdc) with Ln(NO3)3·nH2O (Ln = La, Gd, Dy; n = 6, 5, 4) has also been studied; there is a marked difference in the complexes obtained and consequently in the coordination ability of H2tdc towards lanthanide with respect to H2pdc. (literal)
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