While the electronic transitions of the Q-and B-bands are well separated, the spectrum above 4 eV convolutes more close-lying states. Especially the C-and X-band regions contain a high density of states stemming from the large aromatic system of the TBP ligand. In the absorption spectrum of Figure , it is seen that the B-band has much higher intensity than the Q-band, consistent with previous findings. The MCD spectrum is predominantly given by A terms, occurring in all bands except the X-band. The A terms are positive, as it can be seen from the negative wing at lower energies.