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Why pyridine-d5 solvent deshielded chemical shift in proton NMR?

The structure I sent for proton NMR dissolved in pyridine produce almost similar structure as the reference I found. However, this reference was dissolved in MeOD. Does pyridine-d5 produce downfield chemical shifts? Does anyone know why?

Thank you.

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    $\begingroup$ Are you using a chemical shift reference (eg TMS, DSS)? $\endgroup$
    – Buck Thorn ♦
    Commented Jul 8 at 13:26
  • $\begingroup$ When you are preparing a solution you get a mixture in which molecules of your compound are sorrounded by molecules of the solvent - and they interact, e.g. through dipol-dipol interactions or hydrogen bonding. This means that molecules of a specific compound in different solvents can be, on avereage, in different states whent it comes to their energy. As a consequence, excitation of nuclei can occur at different frequencies between these solutions - in other words chemical shifts may be different. However, it is hard to tell whether they will go up or down between specific solvents. $\endgroup$
    – Fractal
    Commented Jul 8 at 20:14

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