Characterization of Copper(II), nickel(II), cobalt(II) and palladium(II) complexes of vicinal oxime-imine ligands; induced chelate isomerism in the same molecule of the nickel(II) complex |
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| Authors: | M M Aly Sana M Imam |
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| Institution: | (1) Chemistry Department, Faculty of Science, Kuwait University, Kuwait;(2) Chemistry Department, Faculty of Science, El-Menoufia University, Egypt |
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| Abstract: | Summary Metal complexes of the title ligands were characterized in order to determine the factors influencing the stability of chelate isomerism in the same molecule. The ligands were prepared by 1:1 condensation of isonitrosoacetylacetone (Hiso) with eithero-aminophenol (H2
isoaph),p-aminophenol (H2
isopph), or aniline (Hisoanil). The following complexes have been synthesized: (isoaph)Cu]4, (Hisoaph)2Co, (Hisopph)2
M·nH2O (M=Ni(II), n=2;M=Pd(II), n=0;M=Co(II), n=2), (isopph) Cu·H2O]2, and (isoanil)2
M (M=Ni(II), Cu(II), Co(II), or Pd(II)). Both chelate rings in these metal complexes are five-membered. Transimination of one –C=N–C6H5 group to –C=NH in (isoanil)2Ni produced a six-membered chelate ring in (isoim)Ni(isoanil). The induced chelate isomerism is ascribed to intermolecular hydrogen bonding of the imino-hydrogen and the basic nitrogen of the same six-membered chelate ring of an adjacent square planar molecule. Other types of hydrogen bondings with the oximato oxygen (intra- or intermolecular) favour the formation of five-membered chelate rings. Analytical, spectroscopic, and magnetic moment data are in accordance with the suggested formulations.Part of the Ph.D. thesis of Sana M. Imam |
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| Keywords: | Induced chelate isomerism Metal complexes of vicinal oxime-imine ligands Hydrogen bonding in metal complexes |
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