Aryl diazonium salt of antranilic acid and 2-aminophenol are coupled with acetyl acetone to synthesize ONO donor tridentate ligands of the type R-C₆H₅-N=N-C(=C(OH)CH₃)COCH₃ (R = COOH [HL¹], OH [HL²]). The ligands can show keto-enol tautomerism. The ¹H NMR spectra suggest that they exist in enol form. They can bind to the metal through O, N and O donor centers. The reaction of Cu(NO₃)₂ with HL¹ and HL² in presence ammonium hydroxide formed chelate complexes of the type Cu₂L¹₂ and Cu₂L²₂. Copper (II) complexes have been confirmed by ¹H NMR, FT-IR spectra, magnetic moment and elemental analysis. The solution spectra complexes exhibit both ILCT and MLCT bands.