Uncommon mononuclear pyrazole–pyrazolate complexes of CoII, CuII and Zn†
*a
Konstantin A.
Babeshkin,
a
Nikolay N.
Efimov,
a
Claudio
Pettinari,
b
Igor L.
Eremenko
a
and
Abstract
Novel mononuclear complexes [M((CF3)2pz)2((CH3)2pzH)2] (M = Zn (1), CoII (2), and CuII (3)) and binuclear complexes [Cu2(μ-(CF3)pz)2((CH3)2pzH)2(OOCBut)2] (4) were prepared by different simple synthetic methods and characterized by single crystal X-ray diffraction analysis. Compounds 1 and 2 have a similar structure with a tetrahedral metal environment, unlike compound 3, in which copper is in a square-planar environment. A copper square planar environment is also found in 4. The structures of the complexes are stabilized by intermolecular (1, 2, and 4) and intramolecular (3) hydrogen bonds. 1 was additionally characterized in solution by 1H NMR. The study of thermal behavior indicated the transformation of 2 into the pyrazolate bridging polymer [Co((CH3)2pz)2]n at 330 °C. Magnetic susceptibility measurements in the ac-magnetic field show the presence of slow field-induced (Hdc = 2500 Oe) magnetic relaxation behavior for the Co-based complex 2.
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