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SM ISO690:2012 ILIES, D., SHOVA, Sergiu, PAKHONTSU, E., GULYA, Aurelian, ROSHU, T.. 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. |
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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 | ||||||
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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). |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Ilies, D.</dc:creator> <dc:creator>Şova, S.G.</dc:creator> <dc:creator>Pahontu, E.</dc:creator> <dc:creator>Gulea, A.P.</dc:creator> <dc:creator>Roşu, T.</dc:creator> <dc:date>2014</dc:date> <dc:description xml:lang='en'><p>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 <strong>4 </strong>have been determined by single-crystal X-ray diffraction. The ligand <strong>HL</strong><strong>1 </strong>crystallized into monoclinic lattices with space group P-1 21/c-1 and the complex <strong>4 </strong>crystallized into monoclinic lattices with space group P-121/c-1. The ligand <strong>HL</strong><strong>1 </strong>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 <strong>2</strong>,<strong>3</strong>,<strong>5 </strong>and <strong>6</strong>, the HL1 act as a mononegative bidentate ligand coordinating to the metal ion through the azomethine nitrogen atom and thiolato sulphur atom. In complexes <strong>1 </strong>and <strong>4 </strong>the ligand coordinates in a neutral bidentate manner. The values of μeff (1.63 – 2.20 MB) for complexes <strong>1 </strong>– <strong>6 </strong>suggest the presence of an unpaired electron and indicates the existence of monomeric species of copper(II). The EPR spectra of the complexes <strong>2</strong>, <strong>3</strong>, <strong>5 </strong>and <strong>6 </strong>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).</p></dc:description> <dc:source>The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova () 82-82</dc:source> <dc:title>New copper(II) complexes with 1,5-bis(thiophenylidene) thiocarbohydrazone. Synthesis, characterization and crystal structure</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>