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Synthesis, crystal structure, and magnetic properties of a cobalt(II) complex with (3,5-dichloropyridin-4-yl)(pyridin-4-yl)methanol

Zhicheng Zhu and Masahiro Mikuriya

Department of Chemistry and Open Research Centre for Coordination Molecule-Based Devices, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo Prefecture 669-1337, Japan

 

E-mail: junpei@kwansei.ac.jp

Received: 30 October 2007  Revised: 23 January 2008  Accepted: 5 February 2008

Abstract: A novel bridging ligand, (3,5-dichloropyridin-4-yl)(pyridin-4-yl)methanol (I), and its cobalt(II) complex, [Co(I)2(NCS)2]n (II), were prepared. The structures of ligand I and complex II were determined by single crystal X-ray analysis. Magnetic susceptibility measurements were performed for cobalt (II) complex II. Compound I crystallised in orthorhombic space group Pbca with a = 7.6585(14) Å, b = 12.209(2) Å, c = 23.207(4) Å, V= 2170.0(7) Å3 and Z=8. Complex II crystallised in monoclinic space group P21/n with a = 13.223(8) Å, b = 16.959(10) Å, c = 13.948(8) Å, β = 115.395(10)°, V= 2826(3) Å3 and Z = 4. Each cobalt(II) ion is surrounded by two NCS anions and four pyridyl moieties from two bridging ligands. Each bridging ligand connects two neighbouring Co(II) ions to form a 2-dimensional structure. Temperature dependence of the molar magnetic susceptibilities in the temperature range of 2–300 K revealed that magnetic interactions between the cobalt ions are weak.

Keywords: cobalt complex - bridging ligand - magnetic properties

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-008-0044-9

 

Chemical Papers 62 (4) 423–427 (2008)

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