Molecular Structure Differences That Induce a Change in Optical Properties of Picene-13, 14-Dione (image) Kumamoto University Share Print E-Mail Caption Twist strain and Ï-conjugated molecules that induce dramatic changes in optical (color and florescence) properties of picene-13, 14-dione. Credit Dr. Hayato Ishikawa Usage Restrictions This image may only be used in conjunction with the accompanying release, or stories written about the work described in the release with reference to the original work. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.