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 1 2007

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

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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