Template synthesis and structure of Co(II), Ni(II), and Cu(II) complexes with pyridoxilydenetaurinate Schiff base ligand

[Display omitted] •Stoichiometry of all three complexes is identical: [ML2(H2O)2].•The Schiff base ligand is bonded by N and O atoms, forming a chelate ring.•The equivalent donor atoms (N, O, Owater) are in trans arrangement.•IR spectra of the ligand K+ salt and of the complexes were compared.•In cr...

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Published in:Inorganica Chimica Acta Vol. 477; pp. 248 - 256
Main Authors: Guricová, Miroslava, Pižl, Martin, Smékal, Zdeněk, Nádherný, Ladislav, Čejka, Jan, Eigner, Václav, Hoskovcová, Irena
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 24.05.2018
Elsevier Science Ltd
Subjects:
Chelates
Chemical reactions
Chemical synthesis
Co(II), Ni(II), and Cu(II) complexes
Coordination compounds
Copper
Crystal structure
Ethanol
Fourier transforms
Imines
Infrared spectroscopy
Ligands
Molecular chains
Nickel
Pyridoxal
Schiff base
Spectrum analysis
Sulfonic acid
Taurine
Water chemistry
Schiff base
Pyridoxal
Taurine
Co(II), Ni(II), and Cu(II) complexes
Crystal structure
ISSN:0020-1693, 1873-3255
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Summary:[Display omitted] •Stoichiometry of all three complexes is identical: [ML2(H2O)2].•The Schiff base ligand is bonded by N and O atoms, forming a chelate ring.•The equivalent donor atoms (N, O, Owater) are in trans arrangement.•IR spectra of the ligand K+ salt and of the complexes were compared.•In crystal, ligands of the [CoL2(H2O)2] are puckered: pyridine and chelate rings and not co-planar. Co(II), Ni(II), and Cu(II) complexes with a Schiff base ligand pyridoxylidenetaurinate (L−) were prepared by a template reaction of pyridoxal (3-hydroxy-5-(hydroxymethyl)-2-methylpyridine-4-carbaldehyde), taurine (2-aminoethane-1-sulfonic acid), and the corresponding metal acetate in water–ethanol solution. Composition of the product was [ML2(H2O)2] for all three central metals. Coordination geometry varied from weakly distorted octahedral (Co, Ni) to strongly distorted octahedral (Cu) with trans arrangement of both water molecules and imine N atoms. Each bidentate ligand formed one chelate ring via iminic N and phenolic O donor atoms. The complexes were characterised by elemental analysis, FTIR spectroscopy, and XRD crystal and powder analyses. All complexes crystallize in monoclinic system with space group P21/c. IR spectra of the complexes showed changes typical for Schiff base coordination, comparing with IR spectrum of the ligand.
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ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2018.03.031