Diamagnetic anisotropies of some organic molecules

The molecular susceptibilities and anisotropies of some aromatic molecules have been deduced from their crystal diamagnetic susceptibilities and their molecular orientations. The molecules investigated are 10,10'- dianthronyl, bi(anthracene-9,10-dimethylene) photo-isomer and potassium acid phthalate. The molecular anisotropy can usually be calculated with a good degree of accuracy even in cases where the mean absolute susceptibility is not known with certainty.