Triplet ligand centered

The first experiments in this direction were carried out on the triads 244+ and 254+ (Fig. 8), by exciting preferentially the metal centre around 340-355 nm. Excitation at this wavelength region produces to a predominant extent the excited state localized on the iridium complex unit, the ligand centered triplets PH2 - 3Ir - PAu or PZn - 3Ir - PAu [48]. Energy transfer to the porphyrin triplets dominates the deactivation of PH2 - 3Ir - PAu in 244+, with rate constants of 2.9 x 1010 s 1 for the transfer to the gold porphyrin localized excited state and ca. 1011 s 1 to the free base porphyrin localized excited state, respectively (Scheme 9). 

The resulting (sub)states are displayed in Fig. 11. The first state (Fig. 11a) is the triplet resulting from a n —> n single excitation, i.e., a ligand-centered (LC) triplet denoted as The upper left index corresponds to the spin multiplicity (25+1)... 

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