Preparation and characterization of some metal(II) complexes of isocinchomeronic acid and X-ray crystal structure ofcis-diaquabis(hydrogen isocinchomeronato)manganese(II) |
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Authors: | Goher Mohamed A S Mak Thomas C W |
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Institution: | (1) Department of Chemistry, Faculty of Science, Alexandria University, Alexandria, Egypt;(2) Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong;(3) Department of Chemistry, Faculty of Science, Kuwait University, P.O. Box 5969, 13060 Safat, Kuwait |
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Abstract: | The reactions between Mn(II), Co(II), Ni(II), and Zn(II) ions with isocinchomeronic acid (H2-isocin) afforded complexes of the general formula M(H-isocin)2-2H2O, whereas Fe(II) gives both red and deep red-brown products of the same formula. Various physical measurements suggest that the complexes of M = Co, Ni, Zn, and Fe (brown) are octahedrally coordinated by two aqua ligands and twotrans-N,O-bidentate H-isocin– anions with dimeric hydrogen bonding. Those for M = Mn and Fe (red) are the correspondingcis isomers. The structure of the manganese complex as determined by X-ray crystallography exhibitsC
2 molecular symmetry with Mn-N = 2.279(2), Mn-O(H-isocin)– = 2.196(2), and Mn-O(aqua) = 2.137(2) Å. Each aqua ligand forms two donor O-H O hydrogen bonds with carboxy groups of different molecules in adjacent chains. |
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Keywords: | Isocinchomeronic acid 2 5-pyridinedicarboxylic acid hydrogen isocinchomeronate manganese(II) complex crystal structure |
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