Quenching experiments. Quenching by iodide anions or nitromethane of the singlet excited states of pyrene in OTPh/NaDC/pyrene and NaDC/pyrene solutions was carried out by sequential injections into the same solution of increasing volumes of quencher. For the OTPh/NaDC/pyrene and NaDC/pyrene hydrogels, different gels were prepared for each concentration of quencher maintaining OTPh/NaDC/pyrene and NaDC/pyrene concentrations constant. The emission spectra for pyrene were integrated between 372 and 396 nm. The ratio of intensities in the absence (I0)