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Pyrazolonderivate VII Synthese und Struktur von Metallchelatkomplexen mit 4-aminomethylen-Δ2-pyrazolinon-(5)-ligaden

Synthesis and structure of metal complexes with 4-aminomethylene-Δ2-pyrazoline-(5) ligands ligands

Eine15N-,1H- und13C-NMR-Studie

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Abstract

In the reaction of 4-aminomethylene-Δ2-pyrazolin-5-ones with metal acetates new chelate complexes with a ligand-metal ratio of 2:1 are formed. For structural investigations15N-labeled compounds and azomethines of the pyrazole type are also prepared. The15N-,13C-, and1H-chemical shifts have been measured in CDCl3. Chemical shifts as well as coupling constantsnJ (13C−15N)n=1, 2;2 J (HC=15N);2 J (=CH15N) are discussed with regard to the structure of metal complexes and azomethines. It has been shown that complex formation causes a considerable change of the π-electron structure within the merocyanin part.

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Freyer, W., Radeglia, R. Pyrazolonderivate VII Synthese und Struktur von Metallchelatkomplexen mit 4-aminomethylen-Δ2-pyrazolinon-(5)-ligaden. Monatshefte für Chemie 112, 105–117 (1981). https://doi.org/10.1007/BF00906247

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Keywords

  • Complex formation
  • Coupling constants,15N−Hand 15N−13C
  • Enaminopyrazolones
  • NMR spectroscopy (15N,13C,1)
  • Pyrazole azomethines