Monolayers of europium complexes on water surface have been directly visualized in the gas-liquid expanded region at different temperatures using Brewster angle microscopy (BAM). The film texture with network patterns of the complex (C18)2Eu(DBM)4and hs evolution with time and temperature of the subphase were examined. The average linear cell dimension and the polygon areas have been analyzed as a function of time and the temperature. The mechanism of the domain growth is qualitatively discussed.