期刊
POLYHEDRON
卷 23, 期 5, 页码 841-848出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2003.12.007
关键词
2-methanolpyridine; 2,6-dimethanolpyridine; 2-ethanolpyridinium; cobalt(II) complexes; crystal structures
Cobalt(II) complexes of 2-methanol-, 2,6-dimethanol- and 2-ethanolpyridines have been prepared by the reaction of the corresponding protonated substituted pyridines with [Co(sac)(2)(H2O)(4)](.)2H(2)O, where sac is saccharinate, and characterised by elemental analyses, IR, UV-Vis, magnetic measurements and single crystal X-ray diffraction. The corresponding 2-methanolpyridine (mpy) complex [Co-2(mu-Cl)(2)(mpy)(4)]Cl(2)(.)2H(2)O is dimeric with chloro bridges and each cobalt(II) ion has an octahedral coordination with two chloro and two bidentate (N, O) ligands. In the 2,6-dimethanolpyridine (dmpy) complex [Co(dmpy)(2)]Cl-2, dmpy exhibits a tripodal chelating coordination mode through the N and two hydroxyl O atoms forming a CoN2O4 chromophore. The protonated 2-ethanolpyridinium cation Hpyet serves as a non-coordinating, but hydrogen bonded counter ion in [Co(Cl)(4)](Hpyet)(2). Based on the molecular structures, the electronic, IR spectra and thermal behavior of the complexes are discussed. 16 (C) 2003 Elsevier Ltd. All rights reserved.
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