Transition metal complexes with pyrazole based ligands, part 15. Cobalt(iii)-, nickel(ii)- and copper(ii)-complexes with 3,5-dimethyl-1-thiocarboxamidepyrazole

K. Meszaros Szecsenyi, V. M. Leovac, Ž K. Jaćimović, G. Pokol

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The complex formation of cobalt(II)-, nickel(II) and copper(II) sulphate hydrates with 3,5-dimethyl-1-thiocarboxamidepyrazole (HL) was studied. The influence of the anions on the course of the reaction was also examined, using nickel(II) salts with various anions. Beside the NiSO4.7H 2O the reaction has been carried out with Ni(OAc)2, Ni(CF3COO)2 and Ni(SCN)2, Compounds with the following composition were obtained: Co(L)3, Ni(L)2 and [Cu(SCN)L]2. The structure of the ligand and the Co(L)3 complex was determined by single crystal X-ray analysis, while that of the Ni(L)2 was solved by analysis of powder diffraction X-ray data, The most probable structure of the copper(II) complex is proposed on the basis of the elemental analyses data, FT-IR spectrometry and magnetic measurement. The thermal decomposition of the complexes was investigated by thermogravimetry, DSC and coupled TG-MS measurements. In the case of the nickel(II) compound, a relatively stable intermediate was detected in the 550-650 K temperature range. The composition of the intermediate, Ni(SCN)(NCS), was determined by FT-IR-spectrometry.

Original languageEnglish
Pages (from-to)943-952
Number of pages10
JournalJournal of Thermal Analysis and Calorimetry
Volume74
Issue number3
DOIs
Publication statusPublished - 2003

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Coordination Complexes
Metal complexes
Cobalt
Nickel
Spectrometry
Transition metals
Anions
Copper
Negative ions
cobalt
transition metals
Nickel compounds
Ligands
nickel
copper
ligands
X ray analysis
Magnetic variables measurement
Hydrates
Chemical analysis

Keywords

  • 3,5-dimethyl-1-thiocarboxamidepyrazole
  • Cobalt(III)-
  • FT-IR-spectrometry
  • Nickel(II) and copper(II) complexes
  • Thermal analysis

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Transition metal complexes with pyrazole based ligands, part 15. Cobalt(iii)-, nickel(ii)- and copper(ii)-complexes with 3,5-dimethyl-1-thiocarboxamidepyrazole. / Meszaros Szecsenyi, K.; Leovac, V. M.; Jaćimović, Ž K.; Pokol, G.

In: Journal of Thermal Analysis and Calorimetry, Vol. 74, No. 3, 2003, p. 943-952.

Research output: Contribution to journalArticle

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AU - Pokol, G.

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