Photoluminescence of 8-quinolinolato(trioxo)rhenium(VII)

The complex ReVIIO3(oxinate) (oxine=8-quinolinol or 8-hydroxyquinoline) shows a green fluorescence at λmax=511 nm with φ=0.012 and a very weak red phosphorescence at λmax=645 nm. Both emissions originate from the lowest-energy ππ* intraligand state of the oxinate ligand. Owing to the d0 electron configuration and the high oxidation state of rhenium the heavy atom effect transmitted to the π-electron system of the oxinate ligand is very weak.