Abstract
CuL2 · 1.5H2O and ML2 · 2H2O · 2EtOH (M = Co2+, Ni2+, Mn2+) coordination compounds were synthesized via the exchange reaction between the sodium salt of 3-methyl-1-phenyl-4-formylpyrazol-5-one (HL) and metal chlorides.The synthesized compounds were studied by thermogravimetry, magnetochemistry, and electron and IR spectroscopy. The complexes CuL2 · 2Py and CoL2 · 2Py · MeOH were obtained via recrystallization from a methanol-pyridine mixture, and their structures were studied by X-ray diffraction. Pyrazolone was found to be coordinated in the deprotonated enol form and to form six-membered chelate rings with a metal. The coordination polyhedron of a metal cation was found to be a square bipyramid (Cu2+) or an axially elongated octahedron (Co2+) with its vertices occupied by the oxygen atoms of 3-methyl-1-phenyl-4-formylpyrazol-5-one and the nitrogen atoms of pyridine.
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