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首页> 外文期刊>Journal of thermal analysis and calorimetry >Divalent transition metal complexes of 3,5-pyrazoledicarboxylate
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Divalent transition metal complexes of 3,5-pyrazoledicarboxylate

机译：Divalent transition metal complexes of 3,5-pyrazoledicarboxylate

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摘要

New divalent transition metal 3,5-pyrazoledicarboxylate hydrates of empirical formula Mpz(COO)(2)(H2O)(2), where M=Mn, Co, Ni, Cu, Zn and Cd (pz(COO)(2)=3,5-pyrazoledicarboxylate), metal hydrazine complexes of the type Mpz(COO)(2)N2H4 where M=Co, Zn or Cd and Mpz(COO)(2)nN(2)H(4)center dot H2O, where n=1 for M=Ni and n=0.5 for M=Cu have been prepared and characterized by physico-chemical methods. Electronic spectroscopic data suggest that Co and Ni complexes adopt an octahedral geometry. The IR spectra confirm the presence of unidentate carboxylate anion (v=v(asy)(COO-)-v(sym)(COO-)> 215 cm(-1)) in all the complexes and bidentate bridging hydrazine (nu(N-N)=985-950 cm(-1)) in the metal hydrazine complexes. Both metal carboxylate and metal hydrazine carboxylate complexes undergo endothermic dehydration and/or dehydrazination followed by exothermic decomposition of organic moiety to give the respective metal oxides as the end products except manganese pyrazoledicarboxylate hydrate, which leaves manganese carbonate. X-ray powder diffraction patterns reveal that the metal carboxylate hydrates are isomorphous as are those of metal hydrazine complexes of cobalt, zinc and cadmium.

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