ligand to ligand charge transfer (LLCT) transition

https://doi.org/10.1351/goldbook.L03519
An electronic transition of a metal complex that corresponds to excitation populating an @[email protected] in which considerable @[email protected] between two @[email protected] has occurred.
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2252 [Terms] [Paper]