Nice video! If you have THF and iodine, you can make stable solution of SmI2, which is red. You can also make green solution of YbI2 in the same way.
Here are some materials:
https://books.google.cz/books?id=QUfQamGsEgwC&printsec=f...
https://pubs.acs.org/doi/10.1021/ja00528a029
Ce(IV) form red complex [CeCl6]2- in conc. HCl (and also chlorine and Ce3+). Heating cause full decomposition to Ce3+ and Cl2.
I read something about Pr(IV) and Tb(IV) complexes with periodate, tellurate and phosphotungstate, which may be interesting and very strong oxidants.
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