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ILIES, D.; SHOVA, Sergiu; PAHONTU, Elena Mihaela; GULEA, Aurelian; ROŞU, Tudor. New copper(II) complexes with 1,5-bis(thiophenylidene) thiocarbohydrazone. Synthesis, characterization and crystal structure. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova. 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 82.
|The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014|
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova" |
Chișinău, Moldova, 28-30 mai 2014
The thiocarbohydrazone Schiff base ligand 1,5-bis(thiophenylidene)thiocarbohydrazone (HL1) with nitrogen and sulphur as donor atoms was synthesized through condensation of thiophene-2-aldehyde and thiocarbohydrazide in the presence of a few drops of HCl. Six copper(II) complexes were synthesized using HL1 and different copper salts. The ligand was characterized by elemental analysis, UV-Vis, FT-IR, 1H and 13C-NMR spectral studies. The structures of the complexes have been proposed by elemental analyses, molar conductance, spectral (IR, UV-Vis and EPR), magnetic and thermal studies. In addition, the structures of the ligand and complex 4 have been determined by single-crystal X-ray diffraction. The ligand HL1 crystallized into monoclinic lattices with space group P-1 21/c-1 and the complex 4 crystallized into monoclinic lattices with space group P-121/c-1. The ligand HL1 coordinates to the copper ion through the sulfur atom and the azomethine nitrogen atom. The physico-chemical analysis confirmed the newly structures of the ligand HL1 and the copper(II) complexes. In the complexes 2,3,5 and 6, the HL1 act as a mononegative bidentate ligand coordinating to the metal ion through the azomethine nitrogen atom and thiolato sulphur atom. In complexes 1 and 4 the ligand coordinates in a neutral bidentate manner. The values of μeff (1.63 – 2.20 MB) for complexes 1 – 6 suggest the presence of an unpaired electron and indicates the existence of monomeric species of copper(II). The EPR spectra of the complexes 2, 3, 5 and 6 recorded in DMSO solution at 77 K show signals specific to a octahedral distorted geometry for the copper center with values of g┴ between 2,076 and 2,078 g. Further, will develop a method for the synthesis of the ligand HL2 and establish his coordination ability in reaction with metal ions like Cu(II), Ni(II),Co(II) and Pd(II).