Transition metal complexes with pyrazole-based ligands. Part 8. Characterization and thermal decomposition of zinc“II” complexes with di- and trisubstituted pyrazoles

K. Meszaros, V. M. Leovac, Ž K. Jacimovic, V. I. Češljevic, A. Kovacs, G. Pokol, S. Gal

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Abstract

We report the synthesis and the characterization “elemental analysis, FT-IR spectroscopy, thermal methods and molar conductivity measurements” of the mixed complexes of zinc with acetate and 3-amino-5-methylpyrazole, HL1, [Zn“OAc”2“HL12], or 3-amino-5-phenylpyrazole, HL2, [Zn“OAc”2“HL22], or 4-acetyl-3-amino-5-methylpyrazole, HL3, [Zn“OAc”“L3”“HL3”]2, with isothiocyanate and HL2, [Zn“SCN”2“HL22], or HL3, [Zn“SCN”2“HL32], and with nitrate, isothiocyanate and 3,5-dimethyl-1-carboxamidinepyrazole, HL4, [Zn“NO3”“NCS”“HL42]. The thermal decomposition of the complexes is generally continuous resulting zinc oxide as end product, except [Zn“OAc”“L3”“HL3”]2, in which case a well-defined intermediate was observed between 570-620 K. On the basis of the IR spectra and elemental analysis data of the intermediate a decomposition scheme is proposed.

Original languageEnglish
Pages (from-to)723-732
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume63
Issue number3
DOIs
Publication statusPublished - Jan 1 2001

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Keywords

  • 3-amino-5-methylpyrazole
  • 3-amino-5-phe nylpyrazole
  • 4-acetyl-3-amino-5-methylpyrazole
  • FT-IR spectroscopy
  • Thermal decomposition
  • Zinc“II” complexes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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