Three polymorphs of a new N,N'-dipropylated isoindigo derivative
Wataru Jozuka1, Sung Hoon Kim1, Shinya Matsumoto1
1Graduate School of Environment and Information Sciences, Yokohama National University, 79-7 Tokiwadai, Yokohama 240-8501, Japan.
Abstract:
A newly synthesized N,N'-dipropyl-substituted isoindigo derivative, namely, 1-propyl-3-(1-propyl-1,2-dihydro-2-oxo-3H-indol-3-ylidene)-1,3-dihydro-2H-indol-2-one, C22H22N2O2, was found to have three polymorphic forms (denoted Forms I, II and III) under various crystallization conditions. Crystal structure analysis indicated that Form III had a significantly different molecular conformation from the other two polymorphs. Their different packing arrangements were correlated with differences in the intermolecular interactions. Thermal measurements revealed that Forms I and II are enantiotropically related, and Form II exhibits thermally dynamic behaviour.
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