4-Cl-o-bis[(3,4-salicylicimino)benzophenimine] phenylenediamine A New Binuclear Bis-Tetra Dentate Salophen ligand; Synthesis, Characterization and Its Complexation to Cu(II)

The condensation of 3,4-diaminobenzophenon and 4-Cl-o-phenylenediamine in mild conditions yields a new tetramine compound which its condensation with salicylaldehyde formed a new unsymmetrical bis-tetra dentate Schiff base salophen ligand with N2O2 donor atoms which named as 4-Cl-o-bis[(3,4-salicylicimino)benzophenimine] phenylenediamine (ClOSBP). The coordination of the ligand for Cu(II) was prepared in ethanol by using Cu(OAc)2. The ligand and its copper complex were characterized step by step with FTIR, 1H NMR, 13C NMR, UV-Vis, CHNS and ICP-OES instruments. Vibrations correspond to two imine (-C=N) bonds were advent at 1612 cm-1 and 1658 cm-1 for ClOSBP which the latter one due to complexation to Cu(II) bearing to red shift and was shifted to 1650 cm-1. Chemical shifts at 12.41 ppm and 9.03 ppm in the 1H NMR spectra were related to hydroxyl group and imine bond of ClOSBP respectively. UV-Vis spectra show well chelation of copper to the ligand so that the absorption bond for imine bond at ClOSBP was shifted to higher wavelength due to chelation. ICP analysis shows stoichiometric chelation for Cu(II) into the ligand.

Keywords:

Salophen ligand , bis-tetradentate , 4-Cl-o- bis[(3 , 4-salicylicimino)benzophenimine] phenylenediamine , Cu(II) complex , Spectral studies