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- W2014416139 abstract "Abstract Non-polymeric and polymeric amphiphilic hemicyanine dyes have been synthesized and extensively characterized as Langmuir films by their isotherm properties, and as Langmuir-Blodgett films by their deposition behaviour, optical absorption spectra and X-ray diffraction. Multilayers of non-polymeric dyes showed optical evidence for both non-aggregated ( λ max = 492 nm and aggregated ( λ max ≈ 420 nm) chromophores. Halide salts in the subphase, and particularli KI, had a marked effect on the isotherms and iodide ions were incorporated into the multilayers where they favoured a non-aggregated structure, presumably by a spacing effect. In alternating multilayers, aggregate formation was avoided by using the cadmium salts of fatty acids, or a polymer, as the optically inactive material. By contrast, multilayers of a polymeric hemicyanine were always free from chromophore-chromophore interactions however deposited ( λ max = 463 nm) and were clear and homeotropic. X-ray diffraction showed good evidence for a superlattice in multilayers of non-polymeric hemicyanine alternating with cadmium arachidate. These findings will be useful in selecting systems for future non-linear optics applications." @default.
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- W2014416139 date "1989-12-01" @default.
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- W2014416139 title "Optical and structural characterization of Langmuir-Blodgett multilayers of non-polymeric and polymeric hemicyanines" @default.
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- W2014416139 doi "https://doi.org/10.1016/0040-6090(89)90268-x" @default.
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