Is 2-naphthol isomorphous with 2-fluoronaphthalene or with naphthalene?

By means of X-rap diffraction and thermal analysis on the systems 2-fIuoron aphthalene - 2-naphthol and naphthalene - 2-naphthol, it is shown that the form in which 2-naphthol crystallizes from the melt is identifiable with th e typical form of naphthalene, Thus, there is second compound in the naphth alenic series for which this form proves to be more stable than the structu rally bordering one preferred by 2-fluoronaphthalene and most of the simple beta-substituted derivatives.