Guglielmo, Giovanni and Ricevuto, Vittorio and Giannetto, Antonino and Campagna, Sebastiano (2005) Absorption Spectra and Luminescence properties of Palladium(II) Terpyridine Complexes. Accademia Peloritana dei Pericolanti Classe FF.MM.NN., 83. pp. 151-156.
The absorption and emission properties of $[Pd(terpy)X]^+ \ (terpy=2,2^': 6,2^"-terpyridine,X=I,Cl,NO_2N_3)$ have been investigated. For comparison purposes, the same properties of the free terpy ligand have also been studied. The absorption spectra are almost solvent independent and quite similar for all the complexes studied, thus indicating that the most prominent bands are due to ligand-centred (LC) tansitions. The lowest energy band, however, is red-shifted with respect to that of the free terpy ligand by about 8100 $cm^-^1$, suggesting a strong distortion of the ligand structure on coordination to the metal atom. All the complexes exhibit a structured, long-lived $(10^-^4-10^-^3_s)$ emission in butyronitrile at 77 K, with energy and bandshape quite similar to the long-lived (13ms) phosphorescence of the free terpy. The dependence of the emission lifetime on the nature of the X ligand is briefly discussed.
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