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Temperature, pressure, and size dependence of Pd-H interaction in size selected Pd-Ag and Pd-Cu alloy nanoparticles: In-situ X-ray diffraction studies Fluorescence spectra of MgP in triphenylene and phosphorescence spectra of CuP and PdP in triphenylene have been obtained from room temperature down to looK. 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-To separation of 267 em-I has been measured.

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The low temperature optical absorption spectra of single crystals of triphenylene doped with Zn porphin have been observed in detail. The spectra consisted of sharp lines, many of which were polarized. This is thought to be the first direct observation of polarized sharp line spectra of a porphyrin. Also observed were a number of weak anomalous absorption lines near the 0-0 transition. but at longer wavelengths. Two different site models were proposed to account for the polarization properties of the spectra. The implication of these results in the interpretation of porphyrin spectra are discussed.