A study of 2-cyanopyridine addition products in the coordination sphere of Ni(II) |
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| Institution: | 1. Departamento de Ciencias Químico-Biológicas, Universidad de las Américas-Puebla, Ex-Hacienda Sta. Catarina Mártir, Cholula, 72820 Puebla, Puebla, Mexico;2. Departamento de Ciencias Biológicas, Universidad Popular Autónoma del Estado de Puebla, Col. Santiago, 72000 Puebla, Puebla, Mexico;3. Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Col. Chamilpa, 62209 Cuernavaca, Morelos, Mexico;4. Centro de Química, ICUAP, Benemérita Universidad Autónoma de Puebla, AP 1613, 72000 Puebla, Puebla, Mexico;5. Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, AP 1613, 72000 Puebla, Puebla, Mexico |
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| Abstract: | The coordination of 2-cyanopyridine molecule to Ni(II) atom promotes a nucleophilic addition of solvent molecules (water, methanol, ethanol) to the nitrile group. The addition of water leads to the formation of solid complexes containing pyridine-2- carboxamide as a chelate ligand. An analogous reaction of 2-cyanopyridine with NiX2 (X = Cl, Br, I, NCS) in methanolic solutions gives, however, complexes containing two or three molecules of O-methylpyridine-2-carboximidate. No nucleophilic addition of solvent occurred with 3- and 4-cyanopyridine under the same reaction conditions.The complexes under study exhibit an octahedral geometry. The structure and the mode of the ligand coordination have been determined by IR spectra. |
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