• Miglior match della libreria: N-esil-esandiammide #76695

• Direct literature evidence tentatively links 682 cm⁻¹ to ‘halo’ [5] and 956 cm⁻¹ to ‘metal‑oxo’ [4]; these assignments come from wholly different material systems (polysaccharides, vanadium oxide nanofibers) and do not fit the polyamide hypothesis, but they highlight that these peaks could have alternative origins if the material is a composite or contaminated.
• The library confidence is low (15 %) and the top hit (N‑hexylhexanediamide) is only one possible aliphatic amide; the exact chain length, aromatic substitution, or presence of minor methacrylate/acrylate C-O‑monomers cannot be determined from IR alone.
• Several candidates in the library’s top‑15 list contain methacrylate or acetate motifs, introducing the possibility of a copolymer or a mixed sample, but the current spectral evidence does not support a major ester component.

Prossimi passi consigliati: Compare the spectrum with reference data for known polyamides (e.g., Nylon 6, Nylon 6/6, N‑hexylhexanediamide) and with aromatic polyamide resins to narrow the structural type. Use complementary techniques such as ¹H/¹³C NMR, mass spectrometry (Py‑GC/MS or MALDI‑ToF), and elemental analysis to confirm the backbone composition and the presence of aromatic rings or additional functional groups. Perform a solvent extraction or pyrolysis to isolate components if a blend is suspected, and acquire reference spectra of the individual candidates for rigorous library search.