In an attempt to introduce the azomethine group in the structure of naphthaldehyde ring , which is known to posses a number of therapeutical applications , and in a purpose of investigating the coordination behavior of the new compounds towards transition metal ions . a number of new Schiff-bases , containing nitrogen and oxygen atoms , have been prepared by condensation of 2-Hydroxy-1-Naphthaldehyde with Aniline and Cyclohexylamine forming β-Naphthaldehyde N-Phenyl Imine (LI) and β-Naphthaldehyde N-Cyclohexyl Imine (LII) respectively.The new Schiff-bases (LI and LII) have been used as ligands to prepare a number of transition metal complexes , which include [Cd(II), Fe(III), Co(II), Cu(II), Cr(III), Hg(II) and V(IV)] ions .The ligands were characterized by FT-IR spectroscopy , and their melting points . The metal complexes of the obtained ligands have been obtained in solid state and were stable towards light, heat and moisture . They were characterized by FT-IR , UV-Vis spectra , conductivity , magnetic susceptibility measurements, and metal analysis .On the basis of these techniques the structural formula of the complexes have been suggested which include :-
1- Complexes of Cd(II), Fe(III), Co(II), Cu(II), Cr(III), Hg(II) and V(IV) ions with (LI) show to have the formulas :-
[Cd LI CL H2O].4H2O , [Fe LI (H2O)2 SO4].4H2O
[Co (LI)2 CL2].H2O , [Cu (LI)2 CL2 ] .2H2O
[Cr (LI)2 CL H2O ] .C2H5OH , [Hg (LI)2 CL2] .2C2H5OH
[VO LI SO4] .H2O
2- Complexes of Cd(II), Fe(III), Co(II), Cu(II), Hg(II) and V(IV) ions with (LII) show to have the formulas :-
[Cd LII CL2] .C2H5OH , [Fe2(LII)2 (OH)2 (SO4)2] .2H2O
[Co (LII)2 ].3H2O , [Cu (LII)2 CL2] .3H2O
[Hg 2(LII)2 CL4] , [VO LI SO4] .H2O
Different bonding and structural behavior were related during the study of coordination chemistry of the different new complexes . The Racah and other ligand field parameters which illustrate the bonding nature between metal ion and donor atoms of the ligand were calculated of Fe(III), Cr(III) and Co(II) complex using (Tanabe-Sugano) diagram.
