Application of Diamagnetic Properties

From experimental fits in the nematic phase (Buka and Jeu [6]). 

Calculated from single crystal data given by Fly-gare [11]. 

Difficulties arise from the determination of the realistic average molecular conformation and the average orientation of the local polarizability tensors with respect to the molecular principal axes frame (PAF of the 

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The enhancement of the diamagnetic susceptibility caused by a ring current is not an isotropic effect but occurs only when the plane of the ring is oriented perpendicular to the external magnetic field. Consequently, the presence or absence of a pronounced anisotropy A% can, in principle, be taken as evidence for or against a ring current and can thus be employed as an aromaticity probe. The need to correct for local anisotropy effects of single and multiple bonds, however, and limitations in the experimental determination of have impeded widespread applications of this property. Moreover, for spherical molecules such as fullerenes, this criterion cannot be sensibly applied at all. 

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