Copper(II) and palladium(II) complexes of 2-amino-5-chlorobenzophenone and 2-(2-hydroxybenzylidene)amino-5-chlorobenzophenone-S-methyl-thiosemicarbazones

Abstract

The S-methyl thiosemicarbazone derivatives of 2-amino-5-chlorobenzophenone and 2-(2-hydroxybenzylidene) amino-5-chlorobenzophenone (L-I and L-II) and their copper(II) and palladium(II) chelates were synthesized. The solid compounds, [Cu( L-I) Cl]Cl center dot 2H(2)O, [Cu( L-II)Cl]Cl center dot H2O, [Pd(L-I) Cl]Cl, and [Pd(L-II)Cl-2], were characterized by elemental analysis, thermogravimetric measurements, electronic, i.r., H-1-n.m.r. and e.p.r. spectroscopy. The ligand behavior of the L-I and L-II explained by means of spectroscopic data. The experimental X-band e.p.r. spectra recorded from two different copper(II) ion coordinated powder complexes have characteristic line shapes that exhibit the axial symmetry around the paramagnetic ions. The theoretically well fitted spectra prove this case too. The absence of hyperfine signals has been attributed to the strong covalency effects of copper electrons with neighbouring N atoms. Orbital energy levels for magnetic electrons were determined from Spin Hamiltonian parameters. The anisotropic Lande splitting factors were specified in an order of g parallel to > g perpendicular to > 2 and this case indicates that the unpaired electrons are located mainly in the d(x2-y2)orbital.