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
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.