Effect of ionic organic additives for the growth of polyene crystals synthesized by Knoevenagel condensations

We demonstrate a simultaneous crystal growth and purification method by using ionic additives for organic -conjugated single crystals grown from impure materials, synthesized by the favorable Knoevenagel condensation reactions. The phenolic polyene OH1 (2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile) single crystals grown in the presence of ionic organic additives, stilbazolium and pyridinium derivatives, exhibit a higher purity and better optical quality compared to crystals grown in the absence of the additives. The phenolic polyene crystals grown in the presence of ionic organic additives, stilbazolium and pyridinium derivatives, exhibit higher purity and better optical quality compared to crystals grown in the absence of the additives.