metal to metal charge transfer (MMCT) transition

https://doi.org/10.1351/goldbook.M03869
An electronic transition of a bi- or poly-nuclear metal complex that corresponds to excitation populating an
electronic state
in which considerable
electron transfer
between two metal centres has occurred.
See also:
intervalence charge transfer
Source:
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2254 [Terms] [Paper]