Does metal always be in reduced state when ligand-to-metal charge transfer can happen?
I saw that when the charge transfer complex absorb the light, the electron in ligand can be excited to metal orbital resulting in reduction of metal.
I am wondering if reduced state of metal is remaining for only very short time, or it is always in the reduced state so the changes in valence state can be observed in XPS analysis or other experimental tools.
The answer will depend on exactly what metal and ligands you are talking about. In many cases the metal ligand bond has at least some covalent character, so you're not fully reducing the metal by 1 electron.
The lifetime of the charge transfer excited state (and the reduced metal) will also vary hugely (fs -us) depending on the metal complex. I don't know about XPS specifically, but other time resolved X-ray techniques have been used to study charge transfer excited states of metal complexes. I'd suggest looking at publications from Lin Chen or Majed Chergui for further information.
Catherine E Mccusker Thank you for your kind answer!
What I wanted to know about the XPS was that whether new bonding can be detected from charge transfer complex forming.
For example, when LMCT takes place between Mn metal center and N from amine group, can I expect to observe new N-Mn peaks in XPS analysis?
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