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Abstract
Crystallization behavior and nature of complexation have been studied for the naptha-lene-picric acid and anthracene-picric acid systems. Phase diagrams were determined experimentally to get the exact compositions of eutectics and molecular complexes. Data on crystallization velocity obey the relation V = u(ΔT) n where ΔT is undercooling, u and n are constant. Experimental values of heats of fusion do not go in subordination with mixture law. Infra-red and ultraviolet-visible spectral studies indicate the charge transfer interactions in both systems.