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Published online by Cambridge University Press: 25 February 2011
We present results of studies of orientational order of Langmuir-Blodgett monolayer and multilayer films based on second harmonic generation and linear absorption measurements. Two new compounds, a tricyanovinyl aniline and a tricyanovinyl azo dye, both possessing large second order molecular susceptibilities have been synthesized and transferred as monolayers from the air-water interface to solid substrates using the Langmuir-Blodgett technique. The azo dye is a superior Langmuir-Blodgett material, forming films which are chemically and structurally stable. Multilayers of this compound show an enhancement in polar orientational order with thickness, as observed in the dependence of the second harmonic polarization components on number of layers.