PALLADIUM(II) AND RUTHENIUM(III) COMPLEXES OF SOME PYRAZOLONE AZO DERIVATIVES

The reactions of the ligands; antipyrine-4-azo-5(3,5-dimethylpyrazole) (L1) (1 mol) and antipyrine-4-azo-5 (3,5-dimethyl-1-phenylpyrazole) ( L2) (1 mol) with potassium chloropalladate (K2PdCl4) and ruthenium(III ) chloride (1 mol) in EtOH produce complexes of the type PdLCl2 and Ru LCl3 where L = L1 or L2. The ligands antipyrine-4-azo-5(3--methylpyraz olone) (HL3) and antipyrine-4-azo-5(3-methyl-1-phenylpyrazolone) (HL4) (1 mol) react with 1 mol of K2PdCl4, and RuCl3.3H2O in EtOH to yield the complexes PdLCl and RuLCl2. The IR spectral data show that L1 and L2 behave as neutral bidentate ligands in hydrazo-form, whereas, HL3 a nd HL4 behave as monobasic tridentate ligands in the enolazo form. The electronic spectra and magnetic measurements reveal that Pd(II) compl exes exhibit square planar structures. The IR and magnetic data show a lso that Ru(III) complexes are dimers. The complexes were characterize d by elemental analyses, conductance, spectral and magnetic susceptibi lity measurements.