Intraligand fluorescence and phosphorescence of tris(pyrazolyl) hydridoborate complexes

The complexes GdTp3 and PPh3AgTp with Tp = Hydridotris(1-pyrazolyl)borate in the solid state are characterized by rather similar luminescence spectra which consist of a fluorescence near 390 nm and a phosphorescence near 480 nm. These emissions originate from a Tp− ππ∗ IL singlet and triplet, respectively. Owing to the heavy-atom effect of Gd and Ag the phosphorescence appears also at rt.