Synthesis,spectroscopic characterization and thermal studies of some lanthanide（Ⅲ） nitrate complexes with a hydrazo derivative of 4-aminoantipyrine
来源期刊：Journal of Rare Earths2009年第5期
论文作者：K.Mohanan C.J.Athira Y.Sindhu M.S.Sujamol
文章页码：705 - 710
摘 要：A heterocyclic ligand synthesized by the coupling of diazotized 4-aminoantipyrine with acetylacetone reacted with lanthanide（Ⅲ） nitrate to form complexes of the type [Ln（HAAP）2（NOз）з] where, Ln=La（Ⅲ）, Ce（Ⅲ）, Pr（Ⅲ）, Nd（Ⅲ）, Sm（Ⅲ）, or Gd（Ⅲ） and HAAP=3-{[2-（N-1-phenyl-2,3-dimethylpyrazol-3-in-5-on-4-yl）]hydrazone}pent-2,3,4-trione. The ligand and metal complexes were characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements, UV-Visible, infrared, far infrared and proton NMR spectral data. The spectral data revealed that the ligand existed in the hydrazo form and coordinated to the metal ion without deprotonation in a neutral tridentate manner, through carbonyl oxygen of pyrazolone ring, hydrazo nitrogen and carbonyl oxygen of the acetylace-tone moiety. The molar conductance values adequately supported their non-electrolytic nature. The ligand and the praseodymium（Ⅲ） complex were subjected to X-ray diffraction studies. Thermal decomposition behavior of the lanthanum（Ⅲ） complex was also examined.
K.Mohanan，C.J.Athira，Y.Sindhu，M.S.Sujamol
Department of Chemistry,University of Kerala
摘 要：A heterocyclic ligand synthesized by the coupling of diazotized 4-aminoantipyrine with acetylacetone reacted with lanthanide（Ⅲ） nitrate to form complexes of the type [Ln（HAAP）2（NOз）з] where, Ln=La（Ⅲ）, Ce（Ⅲ）, Pr（Ⅲ）, Nd（Ⅲ）, Sm（Ⅲ）, or Gd（Ⅲ） and HAAP=3-{[2-（N-1-phenyl-2,3-dimethylpyrazol-3-in-5-on-4-yl）]hydrazone}pent-2,3,4-trione. The ligand and metal complexes were characterized on the basis of elemental analysis, molar conductance, magnetic susceptibility measurements, UV-Visible, infrared, far infrared and proton NMR spectral data. The spectral data revealed that the ligand existed in the hydrazo form and coordinated to the metal ion without deprotonation in a neutral tridentate manner, through carbonyl oxygen of pyrazolone ring, hydrazo nitrogen and carbonyl oxygen of the acetylace-tone moiety. The molar conductance values adequately supported their non-electrolytic nature. The ligand and the praseodymium（Ⅲ） complex were subjected to X-ray diffraction studies. Thermal decomposition behavior of the lanthanum（Ⅲ） complex was also examined.
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