Donor–acceptor substituted polyenes: Orientation in mono‐ and multilayers

The donor acceptor substituted polyene 5-(4-dihexadecylaminophenyl)-2-methyl-2,4-pentadienal (DHAP) is--due to its amphiphilic nature--a promising candidate for the Langmuir-Blodgett (LB) technique. The molecule was studied as a monolayer on a pure water surface under argon atmosphere. Monolayers and multilayers were transferred onto solid support. The films showed a high degree of order in the monolayer as well as in thick multilayers. LB films were investigated with polarisation dependent UV/VIS absorption spectroscopy. The film spectra showed additional absorption peaks which were not present in the spectra of the molecules in solution. The relative peak intensities were highly dependent on the orientation of the electric field vector with respect to the substrate normal. To get a detailed picture of the arrangement of the films on the molecular level, we studied the polarisation dependence of the FTIR spectra in different experimental set-ups. The spectra showed a perpendicular orientation of the conjugated system with respect to the substrate, whereas the backbone of the saturated hydrocarbon chains showed a medium tilt angle of 20.0 ° with respect to the substrate normal. X-ray small angle diffraction measurements were applied to investigate the thickness of the LB layers. From the position of the Bragg peaks, a thickness of 5.45 nm per bilayer can be calculated, in agreement with a bilayer model showing different molecular alignment of the molecules transferred during upstroke and downstroke.

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Highly ordered LB films of DHAP: a donor acceptor substituted polyene

Schmelzer

Roth

Niesert

et al. 1993

Thin Solid Films

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Second-order polarizability of donor—acceptor substituted oligothiophenes: substituent variation and conjugation length dependence

et al. 1993

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Second-order polarixabilities and excited state dipole moments of a number of donor-acceptor substituted a-oligothiophenes have been investigated by use of electric field induced second harmonic generation (WISH), solvatochromism andeiectrooptical absorption measurements (EOAM). The experimental results reveal that oligothiophenes are very effective con&u&m units offering substantial enhancement of the second-order polarixability with increasing chain length.

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Azo-containing polyurethanes with nonlinear-optical properties

et al. 2013

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Donor–acceptor substituted polyenes: Orientation in mono‐ and multilayers

Cited by 3 publications

References 26 publications

Highly ordered LB films of DHAP: a donor acceptor substituted polyene

Highly ordered LB films of DHAP: a donor acceptor substituted polyene

Second-order polarizability of donor—acceptor substituted oligothiophenes: substituent variation and conjugation length dependence

Azo-containing polyurethanes with nonlinear-optical properties

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