• Top library match: Polyacrylamide #14373

• reference library comparison lists Polyacrylamide as the nearest match, but its spectrum does not account for the pronounced carboxylate bands at 1409 and 1600 cm⁻¹.
• The minor band at 892 cm⁻¹ is directly assigned to a Se–O vibration [7], which is incompatible with the dominant organic‑amide‑carboxylate pattern and likely arises from a trace component or an unrelated assignment.
• Many of the literature‑based peak candidates originate from chemically diverse systems (inorganic complexes, biomass, pharmaceuticals), limiting the specificity of some assignments.
• The exact chemical identity remains ambiguous because the spectrum shows features of both a polyamide (amide II) and a zwitterionic carboxylate/amine species, yet lacks a definitive fingerprint for a single material class.
• The assignment of 724 cm⁻¹ to CH₂CH₂O suggests an ether‑containing component; whether this belongs to a copolymer backbone or a separate additive cannot be determined from the FTIR data alone.
• The band at 892 cm⁻¹ has competing literature assignments (alkene, C–O, carbohydrate) and its true origin in the main material is unresolved.

Recommended next steps: Perform complementary analysis by ¹H or ¹³C NMR spectroscopy to confirm the presence of carboxylate, amide, and ether moieties and to determine the molecular backbone structure. Compare the spectrum with those of partially hydrolyzed polyacrylamide, poly(amino acid)s, or commercial water‑soluble polymers containing both amide and carboxylate groups. If quantification of the ether component is desired, consider acid hydrolysis or extraction followed by GC‑MS to detect ethylene glycol or related fragments. Employ ion‑exchange chromatography or pH‑titration to verify the zwitterionic character suggested by the 1409/1600 cm⁻¹ pair.