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Synthesis, characterization and crystal structure of a dodeca-nuclear cobalt (II)cube-octahedron

Ramadan Mohamed Elmehdawi


The new cobalt (II) complex, [Co12 (cpip)12(H2O)12].18.56H2O where H2cpip = 2-(carboxy-phenyl) amino-propanoic acid, was isolated as pink-like prism crystals from the reaction of Co(NO3)2.6H2O and H2cpip in an ethanolic solution. The complex was characterized by Fourier Transform Infrared Spectroscopy (FTIR) and X-ray single-crystal diffraction. The symmetric unit of the title complex contains twelve cobalt atoms arranged in a cube-octahedron. Each divalent cation of cobalt is iso-octahedrally coordinated to four oxygen atoms of two cpip2- ligands in the equatorial plane. The axial plane is occupied by an amino nitrogen atom of one of the cpip2- ligands and an oxygen atom of a water molecule. The lattice water molecule in the metallocycle cavity involved OH­­­O hydrogen bonding with the coordinated water molecules.

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