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Abstract
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Salophens are one of the oldest class of ligands in coordination chemistry[1]. They are easily prepared from condensation reaction of 1,2-phenylenediamine or their derivatives with salicylaldehyde. Salophen metal complexes are formed by the reaction of both main and transition metals. The preparation method of these complexes is easy and sample. These complexes show extensive applications in several fields. A variety of them exhibit special optical properties [2]. They also found applications as electroluminescent materials and biological activities [3, 4]. Here, we investigate the optical properties of Cu(II) and Co(II) complexes with one new salophen-type ligand by UV/Vis spectroscopy. The ligand is synthesized from condensation reaction between 4-chloro-1,2-diaminobenzene and salicylaldehyde. The complexes are easily prepared from the reaction of ligand and Cu(II) and Co(II) acetate salts. In general, the absorption spectra exhibit intense bands in the region 278-338 nm region which can be related to the π→π* and n→π* intra-ligand transitions. n→π* transitions decrease in intensity and shit to shorter wavelengths after complex formation. Moreover the absorption bands between 401- 476 nm is assigned to the metal-ligand charge transfer (LMCT).
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