On the characterization of molecular sieve cavities by the fluorescence oftest molecules

Information about guest-host interaction concerning the incorporation of la rge complexes in molecular sieve was obtained using rhodamine 6 G as test m olecule. We embedded the dye in samples of MCM-41 and EMT type molecular si eves and observed that high concentrations can be reached without undesirab le dye aggregation. The excitation peak at 520 nm with shoulder at 528 nm s hows that our molecular sieves behave as a hydroxylic, relatively polar env ironment, a little more polar than water.