Synthesis, spectroscopic characterization and thermal studies of some lanthanide(Ⅲ) nitrate complexes with a hydrazo derivative of 4-aminoantipyrine |
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摘 要: |
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收稿时间: | 9 March 2009 |
修稿时间: | 9 June 2009. |
Synthesis, spectroscopic characterization and thermal studies of some lanthanide(III) nitrate complexes with a hydrazo derivative of 4-aminoantipyrine |
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Authors: | K Mohanan CJ Athira Y Sindhu MS Sujamol |
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Affiliation: | aDepartment of Chemistry, University of Kerala, Kariavattom Campus Trivandrum-695581, Kerala, India |
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Abstract: | 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(NO3)3] 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 acetylacetone 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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Keywords: | 4-aminoantipyrine acetylacetone lanthanides thermogravimetry X-ray diffraction rare earths |
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