Photoluminescence of |22|Paracyclophane and p-Xylene in the Presence of Silver Ions

Photoluminescence of |22|Paracyclophane and p-Xylene in the Presence of Silver Ions M. Zander Laboratory of Rütgerswerke AG, Castrop-Rauxel Z. Naturforsch. 39a, 10091010 (1984); received August 18. 1984 Phosphorescence spectra and phosphorescence lifetimes of [22]paracyclophane (I) and p-xylene have been mea­ sured in ethanol glass at 77 K in the presence of silver Perchlorate at various concentrations. From the results it is concluded that the ground state complex formed with AgC104 is much more stable in the case of the cyclophane than with /̂ -xylene. The results would indicate that under the conditions used [22]paracyclophane forms a 1:1 com­ plex with AgC104 with the silver ion being located within the cyclophane cage. Fluorescence quenching measure­ ments in fluid solution at room temperature using ethyl bromide and AgC104 as quenchers support this assump­ tion.