Molecular structure and optical properties of the novel amphiphilic derivative of dimethylaminobenzylidene 1, 3 -indandione (C17DMABI), have been studied as the monolayer on a water surface (Langmuir films) and Langmuir -Blodgett (LB) multilayers of Y-type structure using optical absorption techniques.The compression Th -A isotherms of the C17DMABI monolayer show two different phases. Phase transition takes place at surface pressures 1 < TC < 20 mN/rn. The compression -induced changes ofthe monolayer spectra in the region 330 -600 nm have been analyzed using deconvolution of spectra of Gaussian shaped bands. At least three different transitions takes place at -395, -445 and '5O5 nm. Analysis of deconvoluted band spectral shifts, intensities and dichroism confirms a molecular packing rearrangement and change of the tilting angle at the phase transition pressure interval.
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