Y. Sakaino et al., SIMPLE AND EXCELLENT PREPARATION OF POLYMORPHIC CRYSTALS OF IS(4-METHOXYPHENYL)-2-(3-NITROPHENYL)-1H-IMIDAZOLE, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 276, 1996, pp. 259-269
The title imidazole 1 forms inclusion complexes with ethyl acetate, te
rt-BuOH, and benzene. The complexes lost their guest molecule to give
polymorphic crystals A, B, C and D in a pure state. A is red plates, B
is yellow needles, C is pale yellow silky needles and D is light yell
ow cottony needles. The polymorphic crystal turns to the other one whe
n the crystal contacts with organic vapor. The reactivity decreased wi
th B > D > C > A. Structure and reactivity of the polymorphic crystals
are discussed on the type of hydrogen bonding and on molecular arrang
ements in crystals.