Premium
Chemistry of organic eutectics: Phenanthrene — benzoic acid and phenanthrene — cinnamic acid systems
Author(s) -
Rai U. S.,
Shekhar H.
Publication year - 1990
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170250708
Subject(s) - eutectic system , phenanthrene , chemistry , benzoic acid , cinnamic acid , thermodynamics , crystallization , organic chemistry , crystallography , microstructure , physics
Abstract Solid‐liquid equilibrium data for binary systems of phenanthrene with benzoic acid and cinnamic acid, expressed in the form of temperature‐composition curves, show the formation of a simple eutectic in each case. Linear velocity of crystallisation ( v ), studied by capillary method at different undercoolings (Δ T ), suggests the applicability of Hillig‐Turnbull equation, v = u (Δ T ) n , where u and n are constants depending on the nature of solidification. Data on heats of fusion of pure components and eutectics, determined by the DTA method, infer appreciable interaction among the components in the eutectic melts. To highlight the nature of interactions among the components forming the eutectic melt, the excess thermodynamic functions such as h E , s E , and g E were computed. Microscopic studies reveal that the structure of eutectic is different from those of the parent components. Infrared spectra, recorded in the region, 4000 —625 cm −1 , indicate weak interactions among the components in the eutectic.