Syntheses and characterization of copper(II) complexes with Schiff-base ligands derived from ethylenediamine,diphenylethylenediamine and nitro,bromo and methoxy salicylaldehyde |
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| Institution: | 1. Department of Chemical Engineering, Faculty of Engineering, Ardakan University, P.O. Box 184, Ardakan, Iran;2. Department of Chemistry, Payame Noor University, 19395-3697 Tehran, Iran;3. Department of Chemistry, University of Mianwali, Mianwali, Pakistan;4. Department of Chemistry, University of Sargodha, Punjab, Pakistan;5. Department of Physics, University of Sargodha, Punjab, Pakistan;1. Laboratoire d''Electrochimie, d''Ingénierie Moléculaire et de Catalyse Redox (LEIMCR), Faculté de Technologie, Université Ferhat ABBAS de Sétif-1, Sétif 19000, Algeria;2. Département de chimie, Faculté des sciences, Université Ferhat ABBAS de Sétif-1, Sétif 19000, Algeria;3. Departamento de Química Inorgánica, Instituto Universitario de Materiales, Universidad de Alicante, Ap. 99. E-03080 Alicante, Spain;4. Departamento de Química Física, Instituto Universitario de Materiales, Universidad de Alicante, Ap. 99. E-03080 Alicante, Spain |
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| Abstract: | Copper(II) quelates with Schiff bases derived from ethylenediamine, 1R,2R-(+)- or 1S,2S-(?)-1,2-diphenylethylenediamine and 5-X-salicylaldehyde (X=OCH3, H, Br, NO2) have been synthesized and characterized by elemental analysis and IR and UV-visible spectroscopies. The ORD and CD spectra of the chiral ligands and their related complexes have also been measured. The absorption and CD spectra of the metal complexes in the visible region are consistent with near square planar coordination geometries. Trends in absorption spectra over the series of complexes can be correlated with electronic effects of the substituents at position 5 of the salicylaldehyde. The sign patterns of the CD spectra in both UV and visible regions suggest the prevalence of δ and λ conformations for the chelate ring in the complexes of Schiff bases derived, respectively, from R,R- and S,S-diamines. Specific features of the CD spectra of the metal complexes are discussed in terms of the exciton chirality method. |
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