Cobalt(II), Zinc(II) and Cadmium(II)-Squarate Complexes with N-Methylimidazole

  • Hakan Erer
  • Okan Zafer Yeşilel
  • Orhan Büyükgüngör


Three M(II)-squarate complexes, [Co(sq)(H2O)(Nmim)4] (1), [Zn(μ1,3-sq)(H2O)2 (Nmim)2] n (2) and [Cd(μ1,3-sq)(H2O)2(Nmim)2] n (3) (sq = squarate, Nmim = N-methylimidazole) have been synthesized and characterized by elemental, spectral (IR and UV–Vis.) and thermal analyses. The molecular structures of the complexes have been investigated by single crystal X-ray diffraction technique. The squarate ligand acts as two different coordination modes as a monodentate (in 1) and bis(monodentate) (O 1– O 3 ) bridging ligand (in 2, 3). The Co(II) atom has a distorted octahedral geometry with the basal plane comprised of three nitrogen atoms of Nmim ligands and a oxygen atom of squarate ligand. The axial position is occupied by a nitrogen atom of Nmim and one aqua ligand. The crystallographic analysis reveals that the crystal structures of 2 and 3 are one-dimensional linear chain polymers along the c and b axis, respectively. The configuration around each metal(II) ions are distorted octahedral geometry with two nitrogen atoms of trans-Nmim, two aqua ligands and two oxygen atoms of squarate-O1,O3 ligand. These chains are held together by the C–H···π, π···π and hydrogen-bonding interactions, forming three-dimensional network.


Supramolecular complexes Polynuclear complexes Squarate complexes Imidazole complexes N-methylimidazole complexes 


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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Hakan Erer
    • 1
  • Okan Zafer Yeşilel
    • 1
  • Orhan Büyükgüngör
    • 2
  1. 1.Department of ChemistryFaculty of Arts and Sciences, Eskişehir Osmangazi UniversityEskişehirTurkey
  2. 2.Department of PhysicsFaculty of Arts and Sciences, Ondokuz Mayıs UniversitySamsunTurkey

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