2-Substituted-Naphthalene Binary and Ternary Systems:  From Random Alloys to Complexes

2-Chloronaphthalene−octafluoronaphthalene, 2-methylnaphthalene−octafluoronaphthalene binary systems and 2-chloronaphthalene−2-methylnaphthalene−octafluoronaphthalene ternary system have been assessed by differential scanning calorimetry and X-ray powder diffraction. Each binary system presents a 1:1 complex. The pseudobinary section of the ternary system shows a new phase which is probably ordered and may behave as a “complex of complexes”. Finally, ternary alloys show the turn over from ordered to random lattices. Thermodynamic properties of these systems are analyzed through the associated liquid model and the line-compound formalism.