Copper(II) complexes of peptide-group-containing amino acids bis(N-acetyl-l-alaninate)copper(II) complexes and their amine adducts |
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| Affiliation: | 1. Research Laboratory of Polymer Colloids and Nanomaterials, Department of Chemistry, Rajshahi University, Rajshahi 6205, Bangladesh;2. Graduate School of Engineering, Kobe University, Kobe 657-8501, Japan;1. School of Water Resources and Environment, China University of Geosciences (Beijing), 29 Xueyuan Road, Haidian District, Beijing 100083, China;2. Institute of Chemistry, Technology and Metallurgy, Department of Chemistry, University of Belgrade, Njegoševa 12, Belgrade 11000, Serbia;1. Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia;2. Department of Physics, Faculty of Science, Al-Baha University, Alaqiq 65779-6638, Saudi Arabia;3. Department of Biology, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia;4. Department of Physics, Faculty of Science, Alexandria University, Alexandria, Egypt;5. Department of Physics, Faculty of Science, Zarqa University, Zarqa 13132, Jordan;6. Department of Chemistry, Faculty of Science, Al-Baha University, Albaha, Saudi Arabia;7. Department of Physics, Aljamoum University College, Umm Al-Qura University, Makkah, Saudi Arabia;1. Medical Sociology and Health Experiences Research Group, Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, UK;2. School of Sociology and Social Policy, University of Leeds, UK |
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| Abstract: | The bis(N-acetyl-l-alanine)copper(II) monohydrate for which magnetic data and electronic and IR spectra suggest a copper-acetate monohydrate type structure, was prepared. Substitution of the water molecule by some amines was made to investigate their effect on the amino acid coordination and on the geometry around the copper ion. For the adducts of monodentate heterocyclic amines such as N-methylpiperazine, piperidine, morpholine, pyridine, 3- and 4-methylpyridine (CuL2B2) and of bidentate amines such as piperazine, ethylenediamine, 2,2′- and 4,4′-bipyridine (CuL2B) in the solid state or chloroform solution, magnetism, electronic spectra (one d-d band in the 14,500–18,700 cm−1 spectral region, depending on the bascity or steric interference of the amines) and IR spectra suggest a square-planar or strongly distorted tetragonal arrangement around the copper ion with a CuN2O2 or CuN4 chromophore. For the Cu(N-acll-ala)2B2 (B N-methylpiperazine, piperidine and morpholine) adducts in chloroform solution in the presence of excess amine, electronic (two d-d bands) and IR spectra indicate tetragonal arrangement around the copper ion with CuN4O2 chromophore, while for the Cu(N-ac-l-ala)2 · o-phen adduct in the solid state and chloroform solution they suggest the presence of 6-coordinate cis-octahedral species, with CuN2O4 chromophores. In all the adducts studied the IR spectra exclude any interaction between the peptide group and the metal ion. |
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