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The reactions of methyl(2-pyridyl)ketone oxime, (py)C(Me)NOH, with nickel(II) sulfate hexahydrate, in the absence of an external base, have been investigated. The reaction between equimolar quantities of NiSO 4  ·6 H 2 O and (py)C(Me)NOH in H 2 O leads to the mononuclear complex [Ni(SO 4 ){(py)C(Me)NOH}(H 2 O) 3 ] ·H 2 O (1 ·H 2 O), while an excess of the organic ligand affords the 1 : 2 compound [Ni(SO 4 ){(py)C(Me)NOH} 2 (H 2 O)] ·H 2 O (2 ·H 2 O). The structures of both compounds have been determined by single crystal X-ray diffraction. In both complexes the organic ligand chelates through its nitrogen atoms and the sulfate anion acts as a monodentate ligand. The thermal decomposition of complexes 1 ·H 2 O and 2 ·H 2 O has been studied. The IR data are discussed in terms of the nature of bonding and the structures of the two complexes.

Reactions of Nickel (II) Sulfate Hexahydrate with Methyl(2-pyridyl)ketone Oxime: Two Mononuclear Sulfato Complexes Containing the Neutral Ligand