Conclusion
Organic mixture with cyclic and methyl functionalities, possibly containing carbonyl, ester, amide, carboxylate groups, and aromatic rings, with minor inorganic content
General assessmentConclusion
- Direct literature assignments support C-O single bond at 1112 and 1269 cm⁻¹ [11][1], aliphatic C-H stretches at 2963 and 2869 cm⁻¹ [5][3], aromatic C=C at 1413 cm⁻¹ [1], and terephthalate stretching at 1392 cm⁻¹ [8].
- The presence of ether and carboxylate/ammonium motifs is further corroborated by related literature extracts (e.g., ν(C-O-C) in SPE films, COO⁻ symmetric stretch in amino acid–oxide interactions).
- The absorption bands at 2963 and 2869 cm⁻¹ are characteristic of asymmetric and symmetric aliphatic C-H stretching, respectively, supporting the presence of methyl and methylene groups [5][3].
