A phase diagram of hexamethylbenzene-succinonitrile system, determined by the thawmelt method, shows the formation of a eutectic and a monotectic with large miscibility gap in the system. The eutectic and the monotectic contain 0.150 and 0.996 mol fraction of succinonitrile, respectively, and the consolute temperature is 111.5 °C above the monotectic horizontal. Growth behavior of the eutectic, the monotectic, and the pure components, studied at different undercooling temperatures by measuring the rate of movement of solid-liquid interface in a capillary, suggests that the data obey the square relationship between growth velocity and the undercooling. Using enthalpy of fusion data, determined by the DSC method, entropy of fusion, enthalpy of mixing, size of the critical nucleus, interfacial energy, and excess thermodynamic functions were calculated. While the microstructures of the pure components, namely, hexamethylbenzene and succinonitrile show faceted and nonfaceted morphology, respectively, those of the eutectic and the monotectic give lamellar structures.
The complex of o-phenylenediamine (o-PDA) and benzoin (BN) was synthesized adopting solid state reaction by mixing of their melt together followed by chilling. The phase diagram study shows the formation of a complex in 1:1 molar ratio with congruent melting point and two eutectics lying on either side of complex. The formation of complex was confirmed using the FTIR, NMR, mass spectroscopy, powder XRD and DSC studies. The optical properties of the parent component, their complex and few other compositions nearby the complex were studied using absorption and laser luminescence techniques. The significantly higher green/yellow emission was noted with newly synthesized complex as compared to that of their parents as well as other compositions of o- PDA and BN.
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