Hi Viktor, I presume that your molecule is a base. By taking spectra in CF3CO2D it will be protonated. This will result in 13C signal shift which could lead to:

Check the total number of carbons and try to run HSQC and HMBC to get a clearer picture if you are still in doubt

Hello,

If you want the 13C spectra in DMSO-d6, you can try to add one drop of TFA-d (Trifluoroacetic acid-d) to the sample.

My molecule is an aromatic base, and I agree with Dr Magaraci about protonation. But, why are protons visible in DMSO?

Dear Viktor, if you see proton signals in DMSO-d6 which then disappear in CF3CO2D, most likely they are exchangeable protons and get replaced by solvent deuterium.

You want 13C NMR spectra in DMSO-d6 in some samples , you can try to add one drop of TFA-d (Trifluoroacetic acid-d) to the samples and you get that