X-ray reflectivity study of Langmuir films of amphiphilic monodendrons

We have used X-ray reflectivity and Ii-area isotherms to study Langmuir fil ms of a series of second- and third-generation monodendrons with hydrophobi c C12H25 alkyl tails at the periphery and hydrophilic COOHCO2-CH3 or crown ether groups in the core. Both the limiting molecular areas and the layer t hickness's sire consistent with a model in which the chains are directed ne arly perpendicularly away from the water surface.