Iodoanilinium picrate

Crystals of 2-iodoanilinium picrate can be isolated in three polymorphic forms, each of which exhibits a characteristically different color [26]. The structures of yellow Form I and green Form II have been obtained, but the structure of the red Form III could not be solved owing to its instability. Crystals of Form II were found to change into Form... 

The iodoanilinium picrate system was found to exhibit thermochromism for both Form I and Form... 

The two types of hydrogen bonding and how these affect the molecular packing in the two polymorphs of iodoanilinium picrate. The projection of Form 1 is down the a-axis, while the projection of Form 11 is down the b-axis. (The figure is adapted from data presented in Ref. 26.)... 

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