Oxygen‑rich organic material (potential carbohydrate, polyol, or polyether)
General assessment- Direct literature sources support the methyl, alkyl C–H, and C–O single bond assignments observed in the sample.
- The related‑literature interpretation explicitly links the 1393 and 2987 cm⁻¹ peaks to methyl symmetric vibrations (S6).
- The band at 733 cm⁻¹ is consistent with aliphatic C–H bending and is supported by literature assignment to alkyl C–H [2].
Several literature‑assigned groups (phosphate at 902 cm⁻¹ [6], silicon‑oxygen at 954 cm⁻¹ [3], terephthalate at 1393 cm⁻¹ [11]) are chemically distant from the dominant oxygen‑rich organic signature and suggest possible co‑existing inorganic phases or contamination, limiting confidence in a pure organic identification.