Synthesis and Characterization of New Some First Transition Metals Complexes of Schiff Base N,N'-bis[2-Methylenethiophene]-1,2- phenylenediimine.

Abstract

The Schiff base N,N'-bis[2-methylenethiophene]-1,2-phenylen-diimine (L) was
prepared by the reaction of 1,2-phenylendiamine with 2-thiophencarboxaldehyde in
(1:2) molar ratio, the reaction of above ligand with CoCl2.6H2O,
NiCl2.6H2O,CuCl2.2H2O and ZnCl2 respectively in (1:1), (2:1) and (2:2) ligand to metal
molar ratio produce the complexes of the general formula [MLCl2], [ML2]Cl2,
[M2L2Cl4], where M = Co(II), Ni(II), Cu(II) and Zn(II). These complexes were
characterized by infrared and electronic spectra, magnetic moment measurement,
conductivity measurement and metal content analysis. The result of electronic and
magnetic measurements indicate a tetrahedral geometries for the complexes of the
formula [MLCl2], [M2L2Cl4] while the complexes of the formula [ML2]Cl2 show square
planer geometry.