Anisotropies diamagnétiques cristallines et moléculaires du naphtacène

The method developed for determining molecular anisotropies of condensed aromatic compounds crystallizing in the orthorhombic or monoclinic systems has been extended to naphthacene, C ₁₈H₁₂. This compound belongs to the triclinic system and the unit cell contains two independent molecules. Some uncertainties in Banerjee's [Z. Kristallogr. (1938), 100, 316-355] experimental measurements have been removed. The calculated values of the molecular anisotropies fit in with those of other, earlier investigated, condensed aromatic compounds.