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

K. Mészáros Szécsényi, V. M. Leovac, Ž K. Jaćimović, V. I. Češljević, A. Kovács, G. Pokol, S. Gál

Research output: Contribution to journalArticle

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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(HL1)2], or 3-amino-5-phenylpyrazole, HL2, [Zn(OAc)2(HL2)2], or 4-acetyl-3-amino-5-methylpyrazole, HL3, [Zn(OAc)(L3)(HL3)]2, with isothiocyanate and HL2, [Zn(SCN)2(HL2)2], or HL3, [Zn(SCN)2(HL3)2], and with nitrate, isothiocyanate and 3,5-dimethyl-1-carboxamidinepyrazole, HL4, [Zn(NO3)(NCS)(HL4)2]. 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 - 2001

Fingerprint

Pyrazoles
Coordination Complexes
Metal complexes
zinc oxides
thermal decomposition
Transition metals
nitrates
Zinc
acetates
Pyrolysis
zinc
transition metals
Ligands
Zinc Oxide
decomposition
conductivity
ligands
synthesis
products
Zinc oxide

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

  • Chemical Engineering(all)

Cite this

Transition metal complexes with pyrazole-based ligands. Part 8. Characterization and thermal decomposition of zinc(II) complexes with di- and trisubstituted pyrazoles. / Mészáros Szécsényi, K.; Leovac, V. M.; Jaćimović, Ž K.; Češljević, V. I.; Kovács, A.; Pokol, G.; Gál, S.

In: Journal of Thermal Analysis and Calorimetry, Vol. 63, No. 3, 2001, p. 723-732.

Research output: Contribution to journalArticle

Mészáros Szécsényi, K. ; Leovac, V. M. ; Jaćimović, Ž K. ; Češljević, V. I. ; Kovács, A. ; Pokol, G. ; Gál, S. / Transition metal complexes with pyrazole-based ligands. Part 8. Characterization and thermal decomposition of zinc(II) complexes with di- and trisubstituted pyrazoles. In: Journal of Thermal Analysis and Calorimetry. 2001 ; Vol. 63, No. 3. pp. 723-732.
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T1 - Transition metal complexes with pyrazole-based ligands. Part 8. Characterization and thermal decomposition of zinc(II) complexes with di- and trisubstituted pyrazoles

AU - Mészáros Szécsényi, K.

AU - Leovac, V. M.

AU - Jaćimović, Ž K.

AU - Češljević, V. I.

AU - Kovács, A.

AU - Pokol, G.

AU - Gál, S.

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AB - 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(HL1)2], or 3-amino-5-phenylpyrazole, HL2, [Zn(OAc)2(HL2)2], or 4-acetyl-3-amino-5-methylpyrazole, HL3, [Zn(OAc)(L3)(HL3)]2, with isothiocyanate and HL2, [Zn(SCN)2(HL2)2], or HL3, [Zn(SCN)2(HL3)2], and with nitrate, isothiocyanate and 3,5-dimethyl-1-carboxamidinepyrazole, HL4, [Zn(NO3)(NCS)(HL4)2]. 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.

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