Complex formation of PdCl2 with 1-substituted 3,5-dimethylpyrazoles

Abstract

Herein the synthesis of 3-(3,5-Dimethyl-1H-pyrazol-1-yl)butanal oxime (L) and its complex formation with PdCl₂ is studied. IR and 1Н NMR spectroscopic methods as well as X-ray diffraction analysis (СIF file CCDC no. 1531058) elucidate that the nitrogen atoms N(4) and N(15) from pyrazole and imine group of oxime respectively, participate in coordination with PdCl₂. Moreover, primarily thermal stability test shows that [PdCl₂(L)] complex (I) is quite stable at moderate temperatures and intense decomposition of latter occurs ca 200–210°C. As a consequence of thermal decomposition, both volatile ligand and its dehydration by-product 3-(3,5-dimethyl-1H-pyrazol-1-yl)butanenitrile are formed. Afterwards, the anticonvulsant properties of PdCl₂, L, and I are of interest and well studied in this section.