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Fourier Transform Infrared Spectroscopic Studies on Alternate-Layer Langmuir-Blodgett Films with Nonlinear Optical Properties

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The nature and extent of molecular “ordering” in alternate-layer Langmuir-Blodgett films of 4-n-heptadecylamido- 4′-nitrostilbene/stearic acid and a functionalized diarylalkyne (JT11) have been elucidated using infrared linear dichroism. Comparison of intensity ratios of certain infrared bands in the attenuated total reflection and the reflection-absorption spectra has been used to determine the details of the molecular geometrical arrangement from the resulting directions of the selected transition moments. This information, along with spectra of hydrogen-bonded stilbene and stearic acid C=O groups, leads to a predicted “structure” which is consistent with the observation of a rather modest nonlinear optical coefficient. This should lead to an improved design strategy for the successful production of organic nonlinear optical devices.

Original languageEnglish
Pages (from-to)262-266
Number of pages5
Issue number1
Publication statusPublished - 1 Jan 1992

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