Three polymorphs of a new N,N ′ -dipropylated isoindigo derivative

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.

Source: Acta Crystallographica Section C - March 21, 2024 Category: Chemistry Authors: Jozuka, W. Kim, S. Matsumoto, S. Tags: crystal structure isoindigo indolone dyestuff polymorphs thermal measurements research papers Source Type: research