An amphiphilic ferrocene derivative 3-ferrocenyl-2-butylene acid(FCA) was synthesized. The mixed FCA/octadecylamine(ODA) monolayers on aqueous subphase were studied by means of surface pressure-molecule area(π-A) isotherm, dπ/dA-A curve and the plot of the apparent area of ODA vs x(ODA). The results indicate that the FCA itself did not form monolayer, but the mixed FCA/ODA mono- layers were stable when the mole fraction of ODA was more than 25%, the mixed monolayers possessed the best stability and the highest incompressibility when the mole ratio of FCA to ODA is 1 to 1.
