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Synthesis, characterization and thermodynamic study of copper(II) complexes with unsymmetric tetradentate Schiff base ligands and X-ray structure of {methyl-2-[N-[2-(5-chloro-2-phenolate)methylidynenitrilo]ethyl}aminato(-1)-1-cyclopentenedithiocarboxylatecopper(II) |
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| Authors: | Mozaffar Asadi Khosro Mohammadi Sheida Esmaielzadeh Hoong-Kun Fun |
| Institution: | a Chemistry Department, College of Sciences, Shiraz University, Shiraz 71454, Islamic Republic of Iran b Chemistry Department, Faculty of Sciences, Persian Gulf University, Bushehr 75169, Islamic Republic of Iran c Department of Earth Sciences, College of Sciences, Shiraz University, Shiraz 71454, Islamic Republic of Iran d X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800, Penang, Malaysia |
| Abstract: | A set of two Cu(II) complexes, Cu(cdXsalen)] and Cu(cdXsalMeen)] derived from Schiff base ligands (H2cdXsalen: methyl-2-{2-(2-X-phenyl)methylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate and H2cdXsalMeen: methyl-2-{1-methyl-2-(2-X-phenyl)methylidynenitrilo]ethyl}amino-1-cyclopenteneithiocarb-oxylate where X = hydroxyl, methoxy, nitro, sodiumsulfite, chloro, bromo and H2cdMesalen: methyl-2-{2-(2-hydroxyphenyl)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate; H2cdPhsalen: methyl-2-{2-(2-hydroxyphenyl)phenylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate; H2cdMesalMeen: methyl-2-{1-methyl-2-(2-hydroxyphenyl)ethylidynenitrilo]ethyl}amino-1-cyclopentenedithiocarboxylate; H2cdPhsalMeen: methyl-2-{1-methyl-2-(2-hydroxyphenyl)phenylidynenitrilo]ethyl}amino-1-cyclopentenedi-thiocarboxylate) with an unsymmetric NNOS coordination sphere have been synthesized and characterized by elemental analysis, IR, UV-Vis and mass spectrometry. The thermodynamic formation constants of the complexes were measured spectrophotometrically, at constant ionic strength 0.1 M (NaClO4), at 25 °C in DMF solvent. The trend of the complex formation for copper is as follow: Cu(cdMesalen)]>Cu(cdsalen)]>Cu(cdPhsalen)]Cu(cdMesalMeen)]>Cu(cdsalMeen)]>Cu(cdPhsalMeen)] |
| Keywords: | Unsymmetrical Schiff base complex Formation constant X-ray crystal structures Thermodynamic Copper complex |
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