• Top library match: dihydroxy-dioxotungsten #77293

• Aromatic C–H stretching above 3000 cm⁻¹ is not observed, which limits confidence in a highly aromatic structure; the aromatic character may be minor or arise from substituent effects.
• The exact molecular architecture remains open; the observed spectral features could originate from a single multifunctional polymer or from a mixture of organic sulfates and carboxylates.
• The sulfate assignment relies on peak‑position compatibility with the library direction rather than on a direct, cited literature attribution for this exact sample.
• The presence of inorganic sulfate (e.g., jarosite‑type) cannot be excluded without complementary elemental analysis.

Recommended next steps: Perform elemental analysis (e.g., XRF or EDS) to check for the presence of tungsten and to assess the sulfur content; a positive tungsten signal would support the library match, whereas dominant carbon and oxygen would favour the organic interpretation. Acquire the spectrum in the far‑infrared (below 400 cm⁻¹) to search for metal‑oxygen lattice vibrations typical of dihydroxy-dioxotungsten. Complement the IR data with Raman spectroscopy or X‑ray diffraction to identify any crystalline inorganic phases that might be present. If the sample is soluble, obtain the ¹H/¹³C NMR spectrum to confirm the organic backbone and the presence of aromatic protons.