Organic Nonlinear Optical Crystals Based on Configurationally Locked Polyene for Melt Growth

• DOI: 10.1021/cm0610130
• Publication Date: 2006-07-30T05:19:20Z
• Authors: O-Pil Kwon; Blanca Ruiz; Ashutosh Choubey; Lukas Mutter; Arno Schneider; Mojca Jazbinsek; Volker Gramlich; Peter Günter
• Keywords: Chromophore; Polyene; Crystal (programming language); Recrystallization (geology); Acceptor; Electron acceptor

A series of nonlinear optical chromophores based on configurationally locked polyene are synthesized, and the single crystal growth from melt investigated. The consist a π-conjugated hexatriene bridge between dialkylamino or methoxy electron donors dicyanomethylidene acceptor. physical properties X-ray structures these characterized. Specifically, chromophore 2-{3-[2-(4-dimethylaminophenyl)vinyl]-5,5-dimethylcyclohex-2-enylidene}malononitrile (DAT2) exhibits strong powder second-harmonic generation signal about 2 orders magnitude greater than that urea large temperature difference 80 °C melting recrystallization temperature. Finally, we demonstrate crystalline thin films DAT2 by Bridgman-type technique, which gives new direction for organic engineering using melt−growth techniques.