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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de Sousa, G.F., Filgueiras, C.A.L. Complexes with ambidentate ligands derived from pyridine and pyrimidine-Part 1. Cyclic nickel(II) complexes. Transition Met Chem 15, 286–289 (1990). https://doi.org/10.1007/BF01061935
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DOI: https://doi.org/10.1007/BF01061935