Complexes with ambidentate ligands derived from pyridine and pyrimidine-Part 1. Cyclic nickel(II) complexes |
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Authors: | Gerimário Freitas de Sousa Carlos A. L. Filgueiras |
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Affiliation: | (1) Departamento de Química, UFMG, 31270 Belo Horizonte, MG, Brazil |
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Abstract: | Summary In a series of hexacoordinated nickel(II) complexes, prepared from thio-, sulphinyl, and carbonyl derivatives of pyridine and pyrimidine, the endocyclic N-atom was always the preferred basic site; the sulphinyl O-atom was also a donor centre, forming 5-membered heterocycles, whereas the carbonyl O-atom did not bond to the metal. Alkylthio derivatives did not react, unlike thiolate anions, which form N, S-bonded 4-membered rings. On the other and 2,2-bis(pyridyl)ketone bonded exclusively through the N-atoms, forming 6-membered cycles. |
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