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This work is focused on the study of the immobilization of a synthetic fluorescent macrocycloureide in a nanostructure obtained through Langmuir−Blodgett (LB) technique. Its interfacial behavior shows that it can take various orientations at the air/water interface. Mixed with behenic acid it is successfully transferred in Y-type onto hydrophobic substrates. The related LB films were controlled through Fourier transform IR spectroscopy and Nomarski microscopy. Fluorescence emission spectra were recorded in air, water, and phosphate buffer at pH 12. Three signals were emitted, corresponding to three different forms of the immobilized macrocycloureide:  monomer, dimer, and molecule stacks. Micromolar concentrations of zinc could be detected through signal fluorescence enhancement of the dimer emission, giving evidence that the immobilized macrocycloureide keeps its fluorescence properties and its ability for molecular recognition of Zn(II) ions.

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This work deals with the behavior studied through the Langmuir-Blodgett technique of a synthetic fluorescent macrocycloureide substituted with two C18-saturated alkyl chains, the distearylmacrocycloureide (DSM). The DSM monolayer exhibited a peculiar behavior when compressed, and a well-defined monolayer to bilayer transition was observed on the π-A isotherms.

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