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Some Physicochemical Studies on Binary Organic Eutectics and 1:2 Molecular Complexes
Author(s) -
Rai U. S.,
George Santhi
Publication year - 1991
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.2170260426
Subject(s) - eutectic system , phase diagram , supercooling , crystallization , hydrogen bond , intermolecular force , melting point , benzidine , crystallography , congruent melting , materials science , eutectic bonding , thermodynamics , chemistry , phase (matter) , molecule , microstructure , organic chemistry , composite material , physics
Benzidine‐m. aminophenol system gives a double simple eutectic type phase‐diagram showing the formation of a 1:2 addition compound with congruent melting point surrounded by two eutectics on either side. The linear velocity of crystallization data on pure components, eutectics, and addition compound suggest square relationship between growth velocity and undercooling. From the X‐ray diffraction studies it can be inferred that the eutectics are not a simple mechanical mixtures of two components. Whereas microstructural investigations suggest faceted growth of the addition compound and a typical characteristic growth of the eutectics, spectral studies indicate the formation of intermolecular hydrogen bonding between two components forming the molecular complex.