Complexing properties of α-nitroketones. Complexes of nickel(II) and cobalt(II)

Abstract

Complexes of the α-nitroketones (LH) nitroacetone, 1-nitrobutan-2-one, 3,3-dimethyl-1-nitrobutan-2-one, α-nitrodeoxybenzoin, 2-nitrocyclohexanone, and 3-nitrocamphor with Ni^II and Co^II of the general formulae ML₂B_n, where B is water (n= 2 or 3), ethanol or pyridine (n= 2), and ML₂ have been prepared and are described in the present paper. It is shown that the α-nitroketonic group is always available for co-ordination to a metal ion and normally behaves as a bidentate O-donor with both the carbonyl and the nitro-group directly participating in the chelation. X-Ray powder patterns, magnetic susceptibility measurements, and diffuse-reflectance and solution spectra in the near-i.r.–visible region have been studied and a six-co-ordinate structure has been established for all the complexes examined.