SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF BIS[3,5-DIMETHYLPYRAZOLE (1-METHOXY,3,5-DIMETHYL PYRAZOLE) COPPER(II) PERCHLORATE]

Abstract The reaction of anhydrous copper nitrate with 1-hydroxy-methyl-3,5-dimethyl pyrazole in the presence of 3,5-dimethyl pyrazole in methanol gave a deep green colored solution, which upon addition of excess sodium perchlorate afforded dark green crystals of bis[3,5-dimethylpyrazole(1-methoxy,3,5-dimethyl pyrazole) Cu(II) perchlorate] (1) upon slow evaporation of the solvent. The structural assignment of (1) was made in part by elemental analysis and electronic spectroscopy and was confirmed by single crystal X-ray diffraction studies. The crystal structure reveals that compound (1) crystallizes in the monoclinic space group P21 In with four molecules in the unit cell of dimensions a = 8.927(3), b = 19.019(9), and c = 9.794(3)A, and β = 112.65(3)∗. The structure has been refined to an R(F) factor of 0.029 based on 2110 observed reflections. The geometry around each Cu(II) center is best described as a square pyramid, with the basal plane occupied by two ligating nitrogen atoms with an average Cu-N di...

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