Molecular structures and spectroscopic characterization of cobalt(III) and nickel(II) complexes of <Emphasis Type="Italic">N</Emphasis>-(2-hydroxyethyl)-2-(thiophene-2-ylmethylene)-hydrazinecarbothioamide |
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Authors: | Mohammad Hakimi Reza Takjoo Vahideh Erfaniyan Esther Schuh Fabian Mohr |
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Institution: | 1.Department of Chemistry,Payame Noor University (PNU),Mashhad,Iran;2.Department of Chemistry, School of Sciences,Ferdowsi University of Mashhad,Mashhad,Iran;3.Fachbereich C–Anorganische Chemie,Bergische Universit?t Wuppertal,Wuppertal,Germany |
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Abstract: | Two complexes of a thiosemicarbazone ligand, namely N-(2-hydroxyethyl)-2-(thiophene-2-ylmethylene)-hydrazinecarbothioamide (HL), have been synthesized. The complexes have been
characterized by physico-chemical and spectroscopic methods. The crystal and molecular structures of CoL3]·2MeOH (1) and NiL2] (2) have been determined by X-ray diffraction studies. For both complexes, the metal is coordinated through the sulfur and azomethine
nitrogen atoms of the thiosemicarbazone. The ligand exists in its thiolate tautomeric form, and the central Co(III) and Ni(II)
atoms have distorted octahedral and square planar geometries, respectively, with five-membered chelate rings formed by the
ligand. The lattice of 1 shows infinite oxygen donor/acceptor hydrogen bonds in the ab plane and weak interactions between rings along the c axis, respectively, giving a supramolecular network. The molecular units in 2 are linked together by hydrogen bonds between the hydroxyl oxygen and hydrazone N proton, giving rise to an infinite ribbon
extended along the c-axis. These chains are connected by N3–H3···O1 interactions that form a sheet within the ac plane. |
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