Synthesis, characterization, molecular docking and DNA binding studies of Cu (II), Ni (II), Zn (II) and Mn (II) complexes

The azo dye ligand of Cyano-6-(p-tolyl) azo-7-hydroxy coumarine (HL) was 
synthesized by coupling of 3-Cyano-7-hydroxy coumarine with p-toluidine. The ligand (HL) 
was formed novel complexes (1–4) with the formulae [Cu (L) Cl (OH 2)] 2H 2 O,[Ni (L) Cl (OH 
2) 3],[Zn (L) Cl (OH 2)] H 2 O and [Mn (L) Cl (OH 2) 3] 2H 2 O, respectively. HL and its 
complexes were characterized by elemental analyses, IR, 1 H NMR, MS and UV–Visible 
spectra as well as magnetic and thermal measurements. The molar conductance 
measurements proved that all the complexes are non-electrolytes. Also, the important 
fragments in the ligand and Ni (II) complex were done using mass spectra and the main 
peaks were corresponding to the molecular weights of them. IR spectra shows that the 
ligand (HL) act as monobasic bidentate coordinated via nitrogen atom of the azo group