• Top library match: diazanium;sulfate #142761

• The related‑literature interpretation describes a cellulose‑like polysaccharide backbone with C–O–C/ring modes, carbonyl, and carboxylate functionalities, which is inconsistent with a pure ammonium sulfate identification.
• The low library similarity (0.659) and small lead gap (0.059) among the top candidates show that the spectral database alone does not confidently resolve the material.
• The sample may be a mixture of inorganic amine/ammonium salts and organic biopolymer or carbohydrate; the observed spectral contradictions cannot be resolved without supplementary data.
• Assignments of many low‑wavenumber peaks to metal‑oxygen or silicate‑like species in the literature are chemically incompatible with the primary amine/ammonium direction, suggesting that those features may originate from minor components or are artefacts of the library search.

Recommended next steps: Compare the spectrum directly with a reference of diazanium;sulfate (ammonium sulfate) and, if possible, with ammonium carboxylate salts to assess the contribution of the carbonyl/carboxylate bands. Employ hyphenated techniques such as TGA‑FTIR or pyrolysis‑GC‑MS to detect organic volatiles and confirm the presence of polysaccharide or amine decomposition products. Determine elemental composition by CHNS analysis to verify the nitrogen and sulfur content, clarifying whether the material is predominantly an ammonium salt or an organic amine.