Journal
DYES AND PIGMENTS
Volume 79, Issue 2, Pages 193-199Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2008.02.005
Keywords
tricyanopyrroline chromophore; nonlinear optics; electro-optic effect; electrostatic interaction; lateral moiety; X-ray crystallography
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Tricyanopyrroline-based nonlinear optical chromophores bearing a thienyl or phenyl group perpendicular to the long molecular axis, so as to separate the conjugation planes of the parent chromophore, were synthesized. The incorporation of such a lateral group into the molecular backbone of the colorant, together with the use of a strong tricyano-based acceptor moiety influenced nonlinear optical character. The compounds displayed significantly improved electro-optical properties within a polymer host after poling; values of the electric-optic coefficient of amorphous polycarbonate samples imbibed with the chromophores bearing a phenyl and a thienyl moiety were 32 and 40 pm/V, respectively, which were significantly greater than those of the polymer host bearing the chromophore which did not contain a lateral moiety (similar to 19 pm/V). The attachment of a lateral group to the chromophore increases electro-optic character after poling by suppressing electrostatic interactions. (C) 2008 Elsevier Ltd. All rights reserved.
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