Fluorescence studies of crown ether complexes - solvent effects regarding the inclusion properties of host-guest sensor complexes

摘要

Absorption and fluorescence of a crown ether complex, benzo-15-crown-5 coupled with a fluorescent anthracene unit (AEB), was studied in dependence on the solvent polarity and pH value. Whereas the absorption spectrum is only very weak solvent dependent, the fluorescence spectra are very dependent upon the polarity and the pH of the solvent with spectral changes of about 60 nm. Additional strong fluorescence quenching of the crown ether-anthracene complex in comparison to the pure anthracene was found. The results are discussed in the framework of the dual luminescence concept of Visser and Varma.