Spectroscopic properties of some mixed ligand copper(II) complexes of N-(2-aminoethyl)-1,2-ethanediamine and ethanediamine and its alkylated derivatives |
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| Institution: | 1. College of Veterinary Medicine, Henan Agricultural University, Zhengzhou 450046, China;2. International Joint Research Laboratory for Zoonotic Diseases of Henan, Zhengzhou 450046, China;3. Key Laboratory of Quality and Safety Control of Poultry Products, Ministry of Agriculture and Rural Affairs, China;1. School of Electronic Information and Communications, Huazhong University of Science and Technology (HUST), Wuhan 430074, China;2. State Key Lab. LIESMARS, Wuhan University, Wuhan 430079, China;3. Institute of Automation, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, China;4. School of Electronic Engineering, Xidian University, Xi’an 710071, China;1. Servicio de Microbiología, Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria (IRYCIS), Madrid, Spain;2. Red Española de Investigación en Patología Infecciosa (REIPI), Madrid, Spain;3. Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands;4. Basilea Pharmaceutica, Basel, Switzerland;5. Department of Medical Microbiology and Infectious Diseases, Erasmus MC, Rotterdam, The Netherlands;6. School of Pharmacy, Queen''s University Belfast, Belfast, UK |
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| Abstract: | IR, EPR and electronic spectral studies have been made on a series of complexes with general formula M(dien)L](BØ4)2nH2O (M = Cu(II), Zn(II), Cd(II), dien = N-(2-aminoethyl)-1,2-ethanediamine, L = ethanediamine (en), Me4en, Et2en, Me = methyl, Et = ethyl, BØ4 = tetraphenylborate, n = 0 or 2] taking copper(II) as a magnetic probe in polycrystalline and solution forms to obtain stereochemical information. A five-coordinate square-based pyramidal (SBP) geometry with CuN3N′2 moiety having moderately covalent metal-ligand σ-bonds is found to exist in unalkylated mixed ligand complexes. Among alkylated complexes Cu/Cd(dien)(Me4en)](BØ4)2 is found to possess two species having tetrahedral and SBP with trigonal bipyramidal distortion geometries unlike the other alkylated complexes which have indicated the presence of one species having SBP coordination geometry with varying degrees of trigonal bipyramidal distortions and metal-ligand σ-bond strengths. EPR studies in dilute dmf and pyridine solutions of copper(II) complexes indicated the presence of solute-solvent interaction. |
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