Single site electronic spectroscopy of palladium chlorin in n-octane matrixes at 7 K

The high resolution, single site emission and absorption spectra of palladium chlorin (PdC) in n-octane matrixes at 7 K are reported. The emission and Q and Soret band absorption regions were investigated. The vibrational frequencies of the ground and the lowest energy ππ* excited states were determined from luminescence and excitation spectra, respectively. The emission from PdC was entirely phosphorescence. The emission and Qy region spectra of the complex are similar, having intense, narrow origin bands followed by relatively weak but orderly vibrational structure. The Qx region of this metal chlorin does not have a clear origin and exhibits complex vibrational structure which increases in intensity going to higher energy. In the Soret region of PdC there is only a single intense, broad band.