PREPARATION, SPECTROSCOPIC STUDIES AND X-RAY STRUCTURE OF HOMOBINUCLEAR LANTHANIDE(III) COMPLEXES DERIVED FROM 2,6-DIFORMYL-4-CHLOROPHÉNOL-BIS-(2'-HYDROXY-BENZOYLHYDRAZONE)

  • Pepe Marcel Haba Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Chimie, Dakar, Sénégal
  • Farba Bouyagui Tamboura Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Chimie, Dakar, Sénégal
  • Ousmane Diouf Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Chimie, Dakar, Sénégal
  • Mohamed Gaye* Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Chimie, Dakar, Sénégal
  • Abdou Salam Sall Université Cheikh Anta Diop, Faculté des Sciences et Techniques, Département de Chimie, Dakar, Sénégal
  • Cheick Abdoul Baldé Université de Conakry, Faculté des Sciences et Techniques, Département de Chimie, Conakry, Guinée
  • Carla Slebodnick Department of Chemistry-0212, Virginia Tech, Blacksburg V 24061, Virginia, USA
Keywords: Hydrazones, Binuclear complexes, Lanthanide complexes, X-ray diffraction, Crystal structure

Abstract

Reaction of the 2,6-diformyl-4-chlorophenol-bis-(2'-hydroxy-benzoylhydrazone) with Ln(NO3)3.nH2O (n = 5 or 6 and Ln = Y, La, Ce, Pr, Nd, Sm, Gd, Dy, Er and Yb) produces homobinuclear complexes. These complexes have been characterized by analysis, molar conductance, magnetic measurements, infrared spectral studies and X-ray diffraction. The analytical data showed 1:3 (metal:ligand) stoichiometry. Molar conductance measurements in dmf indicate 1:3 electrolytes in all cases. Magnetic moment values are close proximity of the Van Vleck values. IR studies suggest the coordination of the ligand is through the azomethine, the phenolic oxygen atom and the carbonyl oxygen of the hydrazonic moiety. The nitrate ion is also found to be ionic in all the complexes. An X-ray structure determination of [C66H48N12O15Cl3Er2]Cl2NO3.5H2O confirms the conclusion from the spectroscopic studies and show that the erbium is at the centre of a tricapped trigonal prism with coordination number nine. In all the complexes the lanthanide ions have substantially similar coordination.
KEY WORDS: Hydrazones, Binuclear complexes, Lanthanide complexes, X-ray diffraction; Crystal structure

Bull. Chem. Soc. Ethiop. 2006, 20(1), 45-54.
Published
2006-05-08
Section
Articles

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eISSN: 1726-801X
print ISSN: 1011-3924