Polymorphic
behavior of a yellow isoxazolone dye
E. Aret, H. Meekes, E. Vlieg and G. Deroover
Dyes and Pigments 72 (2007) 339-344
Abstract
The crystal growth of a monotropic polymorphic system of a yellow
isoxazolone dye has been studied. One of the two metastable polymorphs
grows into a needle-shaped morphology; the stable form is rhombic. The
metastable third polymorph grows only from the melt and has a
solid–solid phase transition to the needle-shaped form within hours at
any temperature below the melting point. The polymorphic phase diagram
has been determined for a wide range of concentrations in three
solvents.