Linear and non-linear optical properties of the different Langmuir-Blodgett phases of CnH2n+1-Q3CNQ

Geoffrey J. Ashwell, Gary Jefferies, Emma J C Dawnay, Andrzej P. Kuczyński, Daniel E. Lynch, Yu Gongda, David G. Bucknall

Research output: Contribution to journalArticle

Abstract

(Z)-α-cyano-β-(N-hexadecylquinolin-4-ylium)-4- styryldicyanomethanide, C16H33-Q3CNQ, has two Langmuir-Blodgett (LB) phases that differ in thickness, tilt angle and second-order susceptibility. For phase I, I = 2.2nm layer-1, φ = 8° and χzzz(2) = 180 pm V-1 at 1.064 μm, whereas for phase II, I = 1.6 nm layer-1, φ = 24° and χzzz(2) = 100 pm V-1. The susceptibility of phase I is the highest so far reported for an LB multilayer; the structure is non-centrosymmetric (Z-type) and, as predicted by theory, the second-harmonic intensity varies as I2ω(N) = I2ω(1)N 2 as N increases from 1 to 200 layers. In contrast, C 10H21-Q3CNQ has a low susceptibility (χ zzz(2) = 6 pm V-1) and neutron reflectivity studies have indicated an antiparallel alignment of chromophores at the air/water interface.

Original languageEnglish
Pages (from-to)975-980
Number of pages6
JournalJournal of Materials Chemistry
Volume5
Issue number7
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Materials Science(all)
  • Materials Chemistry
  • Physical and Theoretical Chemistry

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  • Cite this

    Ashwell, G. J., Jefferies, G., Dawnay, E. J. C., Kuczyński, A. P., Lynch, D. E., Gongda, Y., & Bucknall, D. G. (1995). Linear and non-linear optical properties of the different Langmuir-Blodgett phases of CnH2n+1-Q3CNQ. Journal of Materials Chemistry, 5(7), 975-980.