Synthesis and characterization of copper(II) and zinc(II) complexes of chelating ligands derived from 2,6-diacetylpyridine and phenylalanine/tyrosine/histidine/histamine and 2-(2-aminoethyl)-pyridine |
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| Institution: | 1. Laboratoire de Chimie des Matériaux, Faculté des Sciences de Bizerte, 7021 Zarzouna, Université de Carthage, Tunisia;2. Department of Chemical and Pharmaceutical Sciences and Center for Structural Diffractometry, via Fossato di Mortara 17, I-44121 Ferrara, Italy;3. Laboratoire de Chimie Organométallique de Surface (LCOMS), Ecole Supérieure de Chimie Physique Electronique, 69622 Villeurbanne Cedex, France;1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada;2. Department of Catalyst, Iran Polymer and Petrochemical Institute (IPPI), P.O. Box 14965/115, Tehran, Iran;3. Department of Polymer Engineering, Amirkabir University of Technology, P.O. Box 15785, Tehran, Iran;4. Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, P.O. Box 91775, Mashhad, Iran |
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| Abstract: | The copper(II) and zinc(II) complexes of Schiff base ligands L1 and L2 derived from the condensation of 2,6-diacetylpyridine with 2 mol of phenylalanine methyl ester or tyrosine ethyl ester have been prepared. The IR spectral data indicate that the ester group undergoes hydrolysis in the formation of the Zn(II) complexes more readily than that of the Cu(II). The 1H and 13C NMR spectra of the Zn(II) complexes of L1 and L2 as well as those derived from condensation of 2,6-diacetylpyridine and histidine methyl ester (L3), histamine (L4) and 2-(2-aminoethyl)-pyridine (L5) were examined. Differences in IR spectral properties as well as in chemical shifts of similar 1H and 13C nuclei in these five types of complexes have been attributed to significant Zn(II)-carboxylate oxygen interactions in complexes of L1 and L2. |
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