Abstract
The phase-diagram of the benzidine-α-naphthol system, determined by the thaw-melt method, shows the formation of a 1∶1 addition compound surrounded by two eutectics. From the linear velocity of crystallization data on pure components, eutectics and the addition compound, determined by the capillary method at different undercoolings, it can be inferred that they obey the Hillig-Turnbull equation. The X-ray diffraction studies suggest that the eutectics are not simply mechanical mixtures of two components. Heats of fusion data on the pure components, eutectics and addition compound, determined by differential scanning calorimetry, show that there is an associative interaction between the two components forming the eutectic melt. While the microstructural studies reveal that the microstructures of eutectics and the addition compound differ widely from those of the parent components, the spectral investigations suggest intermolecular hydrogen bonding between the two components.
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