Temperature dependence of Mg porphin, Cu porphin, and Pd porphin luminescence

Fluorescence spectra of MgP in triphenylene and phosphorescence spectra of CuP and PdP in triphenylene have been obtained from room temperature down to 10 °K. Analysis of the temperature dependence of the MgP spectra shows that the coupling between the Mg porphin guest and the triphenylene host is weak. A temperature-dependent splitting of the 0–0 phosphorescence band of PdP, previously observed in nonane, was also observed in triphenylene but our attempt to verify a suggested explanation was inconclusive. For CuP in triphenylene, a TD–TQ separation of 267 cm−1 has been measured.