Ligands intraligand transitions

Figure 4.75 Schematic representation of the charge transfer in various excited states of a metal complex. M is the metal centre and L stands for a ligand. LF is a ligand field transition, CTs are the charge transfer transitions, LL is an intraligand transition, and CTTS is a charge transfer to solvent...

The empirical rules for the d-d CD bands are supported not only by the measurement and interpretation of exciton CD in the UV region of the intraligand transitions as described in the next section, but also by the stereospecific formation of diastereomeric complexes having chiral ligands as described in Section 5.3.2. 

Figure 6.17(a) shows the time-resolved transient absorption spectra obtained for [Ru(dcbpy)2(bpzt)] in aqueous solution at pH 7. The important features are the bleaching of an absorption feature with a maximum at 450 nm and the growing in of a new band at 350 nm. The bleaching process can be attributed to the disappearance of the metal-to-ligand charge-transfer (MLCT) transitions in the excited state, while the feature at 350 nm is indicative of intraligand transitions of the dcbpy radical formed upon excitation of the complex. This type of behavior which is typical... 

FIGURE 1 A schematic absorption spectrum of a transition metal complex ion in the UV-VIS region. The central ion bands correspond to d d transitions the ligand bands correspond to charge transfer transitions and/or to intraligand transitions. 

---