Vol. 2, Issue 5 (2018)
New cobalt(II) complex of composition [Co(EtaH)2(Eta)](L)∙EtaH (I) (where EtaH is monoethanolamine NH2(CH)2OH,L= 4-hydroxybenzoate) has been prepared.The crystalstructure of the obtained complex is determined by X-ray diffraction analysis. The crystal is monoclinic, a = 12.4429(13), b =8.9370(9), c =17.9020(15) Å,β= 99.698(9) °, V = 1962.3(3)Å3, space group P21/n, Z = 4.The asymmetric unit consists of mononuclear complex cation [Co(EtaH)2(Eta)]+ with a distorted octahedron geometry and one 4-hydroxybenzoate anion and EtaH molecules. The [Co(EtaH)2(Eta)]+cation contains two neutral and one deprotonated monoethanolamine ligands. Both the two neutral monoethanolamine molecules and monoethanolaminate anion act as bidentate ligands through the amine nitrogen and ethanol oxygen atoms and form five-membered chelate rings. In the [Co(EtaH)2(Eta)]+ cation the NH2 and OH groups are disordered over two positions, with a ratio of their occupancies close to 0.5:0.5. In the crystal, the cations and anions are linked by N-H…O, O-H…O and C-H…O hydrogen bonds.
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