Dear Alberto Mirigliani regular NMR is possible for all soluble compounds, both organic and inorganic. As mentioned by Greg Petruncio it just depends on the nuclei you want to observe. Many inorganic compounds are metal complexes which contain organic ligands which have hydrogen and carbon atoms. Thus 1H and 13C NMR is generally possible for such inorganic compounds, provided that the central metal atom is diamagnetic. 19F and 31P NMR spectroscopy is also possible for both organic and inorganic compounds, and many metal nuclei can be observed by NMR spectroscopy, e.g. 195Pt and 171Yb and many others.

NMR s used for compounds identification of samples containing organic but not Inorganic compounds.However, the organometallic & complexes with organic ligand soluble in deteriorated solvents or solid state NMR can be used for identification.

Mr. Mirigliani,

Please, consider the content of the following discussion; in particular, its part dealing with the most recent trend of the methodological mass spectrometric developments for exact quantification and 3D structural determination of the molecules with the corresponding reference section, therein.

[https://www.researchgate.net/post/Mass_spectrometry_how_to_tell_if_a_file_is_DDA_or_DIA_with_mzML_file]

Happy New 2021 Year!

It depends on the nucleus you are observing. The NMR spectrometer doesnt care if the compound is organic or inorganic. If you are running a 1H NMR and the compound has hydrogen atoms, the NMR will pick it up, regardless if its organic or inorganic.

many nuclei, even transition metals, can be observed

Dear Alberto Mirigliani regular NMR is possible for all soluble compounds, both organic and inorganic. As mentioned by Greg Petruncio it just depends on the nuclei you want to observe. Many inorganic compounds are metal complexes which contain organic ligands which have hydrogen and carbon atoms. Thus 1H and 13C NMR is generally possible for such inorganic compounds, provided that the central metal atom is diamagnetic. 19F and 31P NMR spectroscopy is also possible for both organic and inorganic compounds, and many metal nuclei can be observed by NMR spectroscopy, e.g. 195Pt and 171Yb and many others.