title: Nonlinear optical thin film device from a chiral octopolar phenylacetylene liquid crystal.
abstract: A set of chiral discotic phenylacetylenes have been synthesized by 3-fold Sonogashira coupling between different ethynylbenzenes and triiodobenzenes. The resultant bulk materials are fully characterized by polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction. The octopolar nature of the target compounds is studied by UV-vis absorption spectroscopy and hyper-Raleigh scattering in solution. Optimization of the donor-acceptor substitution yields both high hyperpolarizability values and appreciable mesomorphic properties. A simple thin film device for second harmonic generation has been prepared from the nitro-substituted liquid crystalline derivative.
authors.affiliation: Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: de Vega
authors.forename: Stijn
authors.initials: S
authors.lastname: van Cleuvenbergen
authors.forename: Griet
authors.initials: G
authors.lastname: Depotter
authors.forename: Eva M
authors.initials: EM
authors.lastname: García-Frutos
authors.forename: Berta
authors.initials: B
authors.lastname: Gómez-Lor
authors.forename: Ana
authors.initials: A
authors.lastname: Omenat
authors.forename: Rosa M
authors.initials: RM
authors.lastname: Tejedor
authors.forename: José Luis
authors.initials: JL
authors.lastname: Serrano
authors.forename: Gunther
authors.initials: G
authors.lastname: Hennrich
authors.forename: Koen
authors.initials: K
authors.lastname: Clays