Reactions of divalent transition metal halides with 3,5-dimethyl-1- (hydroxymethyl)-pyrazole

Part 23. Transition metal complexes with pyrazole-based ligands

V. M. Leovac, R. Petković, A. Kovács, G. Pokol, Katalin Mészáros Szécsényi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Factors determining the complex formation reaction of copper(II), nickel(II) and cobalt(II) chloride and copper(II) bromide with 3,5-dimethyl-1-(hydroxymethyl)-pyrazole (HL) has been studied. Depending on experimental conditions, complexes with different composition were obtained: [CuCl2(dmp)]2 (I), [CuCl2(dmp) 2]2 (II), [CoCl2(dmp)2] (III) (dmp=3,5-dimethylpyrazole), [CuBr(L)]2 (IV), [CoCl(L)(EtOH)] 4 (V) and [NiCl(L)(EtOH)]4 (VI). The compounds were characterized by FTIR spectroscopy, solution conductivity and magnetic measurements. The crystal structure of [CoCl(L)(EtOH)]4 has been determined by single crystal X-ray diffraction. The thermal decomposition of the compounds was studied and found to be continuous for all of the compounds. The desolvation mechanism of [MCl(L)(EtOH)]4 (M=Co(II), Ni(II)) is explained on the basis of the route of complex formation of CoCl2 with HL.

Original languageEnglish
Pages (from-to)267-275
Number of pages9
JournalJournal of Thermal Analysis and Calorimetry
Volume89
Issue number1
DOIs
Publication statusPublished - Jul 2007

Fingerprint

Metal halides
metal halides
Coordination Complexes
Metal complexes
Transition metals
transition metals
Ligands
Copper
copper
ligands
Magnetic variables measurement
Nickel
thermal decomposition
magnetic measurement
bromides
Cobalt
Pyrolysis
cobalt
Crystal structure
chlorides

Keywords

  • 3,5-dimethyl-1-(hydroxymethyl)-pyrazole
  • 3,5-dimethylpyrazole
  • Cobalt(II)-
  • Copper(II)-and nickel(II) chloride and bromide complexes
  • FTIR
  • TG
  • XRD

ASJC Scopus subject areas

  • Chemical Engineering(all)

Cite this

Reactions of divalent transition metal halides with 3,5-dimethyl-1- (hydroxymethyl)-pyrazole : Part 23. Transition metal complexes with pyrazole-based ligands. / Leovac, V. M.; Petković, R.; Kovács, A.; Pokol, G.; Szécsényi, Katalin Mészáros.

In: Journal of Thermal Analysis and Calorimetry, Vol. 89, No. 1, 07.2007, p. 267-275.

Research output: Contribution to journalArticle

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abstract = "Factors determining the complex formation reaction of copper(II), nickel(II) and cobalt(II) chloride and copper(II) bromide with 3,5-dimethyl-1-(hydroxymethyl)-pyrazole (HL) has been studied. Depending on experimental conditions, complexes with different composition were obtained: [CuCl2(dmp)]2 (I), [CuCl2(dmp) 2]2 (II), [CoCl2(dmp)2] (III) (dmp=3,5-dimethylpyrazole), [CuBr(L)]2 (IV), [CoCl(L)(EtOH)] 4 (V) and [NiCl(L)(EtOH)]4 (VI). The compounds were characterized by FTIR spectroscopy, solution conductivity and magnetic measurements. The crystal structure of [CoCl(L)(EtOH)]4 has been determined by single crystal X-ray diffraction. The thermal decomposition of the compounds was studied and found to be continuous for all of the compounds. The desolvation mechanism of [MCl(L)(EtOH)]4 (M=Co(II), Ni(II)) is explained on the basis of the route of complex formation of CoCl2 with HL.",
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