Formylpyrazole Thiosemicarbazones

Copperfll) complexes of 4,5-dimethyl-3-formylpyrazole IV-phenyl-thiosemicarbazone, 41, have been prepared by refluxing in ethanol [191]. [Cu(41-H)A], where A = Cl, Br, NO3, NCS and N3, were shown to involve bonding by Al(ring), azomethine nitrogen, and thiol sulfur atoms and all have magnetic moments in the range 1.8-1.9 B.M. The electronic and ESR spectral data for these complexes are comparable to that found for 2-acetylpyridine iV-phenylthiosemicarbazone, 14 [181], 

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Methyl-3-formylpyrazole thiosemicarbazone, 40, yielded [Ni(40)2]A2 (A = Cl, Br, NO3, BF4, CIO4 and 1/2 SO4) from weakly acidic solution [190]. The molecule 40 bonds as a NNS tridentate ligand and all complexes behave as 1 2 electrolytes. Their electronic spectra are consistent with an octahedral stereochemistry and Dq values range from 1111-1190 cm and B values from 629 to 741 cm" ... 

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