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

Abstract

We demonstrate a simultaneous crystal growth and purification method by using ionic additives for organic π-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.