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- W2077126038 abstract "The range of ionic complexes obtainable from cobalt and zinc iodides with pyridine N-oxide (pyo) and trimethylamine oxide has been surveyed. The crystal structures of [Co(pyo)6]2+[CoCl4]2–, [Co(pyo)6]2+2l–, [Co(Me3NO)4]2+2l– and [Zn(pyo)6]2+2[Zn(pyo)I3]– have been determined by X-ray analysis. There is an isomorphous series constituted by [Co(pyo)6]2+[CoX4]2–(X = Cl, Br or I) but the iodide decomposes to [Co(pyo)6]2+2I– in solution. Zinc gives four-co-ordinate molecular complexes [Zn(pyo)2X2] preferentially. With trimethylamine oxide the cobalt co-ordination is also limited to four, as in [Co(Me3NO)4]2+2I–. The steric restriction here is from CH3⋯ O approaches. Spectroscopic evidence on [Co(Me3NO)3I]+I–, which is subject to ligand redistribution in solution, confirms its structure. Pyridine N-oxide differs from Me3NO in the preferential formation of a mixed-ligand anion, as in the isomorphous salts [NEt4]+[Co(pyo)I3]– and [NEt4]+[Zn(pyo)I3]–, and in [Zn(pyo)6]2+2[Zn(pyo)I3]–. In the crystal of the last compound the polarity of the anions leads to their packing into double layers." @default.
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- W2077126038 date "1992-01-01" @default.
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- W2077126038 title "Ionic complexes from cobalt and zinc halides with pyridine N-oxide and trimethylamine oxide" @default.
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