metal to ligand charge transfer (MLCT) transition

https://doi.org/10.1351/goldbook.M03868
An electronic transition of a metal complex that corresponds to excitation populating an electronic state in which considerable electron transfer from the metal to a ligand has occurred.
See also: ligand to metal charge transfer transition
Source:
PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2254 (https://doi.org/10.1351/pac199668122223)