A tricyanopyrroline-based nonlinear optical chromophore bearing a lateral moiety: A novel steric technique for enhancing the electro-optic effect
- Authors
- Cho, Min Ju; Lim, Jeong Hak; Hong, Chang Seop; Kim, Jae Hong; Lee, Ho Sun; Choi, Dong Hoon
- Issue Date
- 11월-2008
- Publisher
- ELSEVIER SCI LTD
- Keywords
- tricyanopyrroline chromophore; nonlinear optics; electro-optic effect; electrostatic interaction; lateral moiety; X-ray crystallography
- Citation
- DYES AND PIGMENTS, v.79, no.2, pp.193 - 199
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 79
- Number
- 2
- Start Page
- 193
- End Page
- 199
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/122423
- DOI
- 10.1016/j.dyepig.2008.02.005
- ISSN
- 0143-7208
- Abstract
- 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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