A novel series of metal complexes with 4-(2, 3-dimethyl-1-phenylpyrazol-5-one azo)-
3-aminophenol ligand (HL) are prepared and characterized by elemental analyses, IR, UV–
Visible spectra, 1 H NMR spectra, mass spectra, X-ray diffraction analysis, conductivity 
measurements and magnetic susceptibility measurements as well as thermal analysis. The 
IR spectrum revealed that the ligand (HL) coordinates as monobasic tridentate manner with 
ONO donor sites of nitrogen atom of azo group (single bond