Abstract
The phase diagram of benzidine with p-nitrophenol shows a 1:1 molecular complex with congruent melting point and two eutectics. The linear growth data on the pure components, the eutectics and the molecular complex, as determined by measuring the rate of movement of the growth front in a capillary, justify the square relationship between growth velocity and undercooling. Thermochemical, X-ray diffraction and microscopic studies have been carried out to investigate the characteristics of the solid eutectics. The microstructural investigations reveal faceted growth of the addition compound, and a typical characteristic growth of this class of eutectics. X-ray diffraction studies suggest that there is orientation of some atomic planes during their formation. Infrared (IR) and nuclear magnetic resonance (NMR) spectral investigations suggest that there is intermolecular hydrogen bonding between the two components forming the molecular complex.
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