Measurement of Diamagnetic Properties

In the last few years the phenomenon has been extensively studied by Sacconi and his colleagues, who have investigated the physical properties of a series of bis(N-alkylsalicylaldimine)nickel compounds the alkyl chains have always been unbranched. Measurements of atom polarizations (221a, 225) and of dipole moments (225) indicate that there are no tetrahedral species in these solutions the dipole moments of both diamagnetic and of paramagnetic species are almost certainly zero, and so the tram-planar configuration (Du, symmetry) is common to both forms. The retention of D2h symmetry in the paramagnetic form does not exclude the possibility of solvent coordination 011 the z-axis. 

The spectral properties of Ni[H2(BAA)2en] are not a sensitive measure of purity with respect to the two positional isomers, but the diamagnetism of the compound may be used to judge purity. If the Ni... 

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