Reactions of divalent transition metal halides with 3,5-dimethyl-1-(hydroxymethyl)-pyrazole |
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| Authors: | V M Leovac R Petkovi? A Kovács G Pokol Katalin Mészáros Szécsényi |
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| Institution: | (1) Faculty of Sciences, Department of Chemistry, University of Novi Sad, 21000 Novi Sad, Trg D. Obradovića 3, Serbia and Montenegro;(2) Hungarian Academy of Sciences, Budapest University of Technology and Economics, Research Group of Technical Analytical Chemistry, 1111 Budapest, Szt. Gellért tér 4, Hungary;(3) Institute for General and Analytical Chemistry, Budapest University of Technology and Economics, 1521 Budapest, Szt. Gellért tér 4, Hungary |
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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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| Keywords: | cobalt(II)- copper(II)-and nickel(II) chloride and bromide complexes 3 5-dimethyl-1-(hydroxymethyl)-pyrazole 3 5-dimethylpyrazole FTIR TG XRD |
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