What absorbs at 1297 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1297 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.

Possible functional-group assignments

Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.

Possible materials

Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.

Spectrum logic

This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1297 cm⁻¹ is usually not enough for material identification by itself.

Real-world usage

This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.

Common mistakes

• Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
• Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
• Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.

Verification advice

When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.

Literature behind these assignments

• Amide confidence 1.0

  “Other less important absorption bands are located at 1582 CdC cm-1, due to the stretching in chloroalkenes, and 1297 cm-1, and 1175 corresponding to amide and benzene ring breathing, respectively (20).”

  Armenta 等 - 2005 - FTIR approaches for diuron determination in commer DOI: 10.1021/jf050268f
• Hydroxyl (O-H) confidence 1.0

  “O-H bending vibration C-O 1297 1338 C-O stretching vibration C-F”

  Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260
• S eq o confidence 1.0

  “cm-1, peaks at 1297, 1213 and 1145 correspond to 0.9987 (r2) coefficient the S=O symmetric, C-C and -SO 2-Nstretching Standard error of cm-1 modes respectively.”

  Attenuated total reflection‐Fourier transform infrared spectroscopy (ATR‐FTIR) for quantification of piroxicam in tablet dosage from as a green analytical method DOI: 10.1002/vjch.202000049
• Water (H2O) confidence 1.0

  “bands centered at 1297, 1288, and 1274 Because the understanding of them, we illustrated all the proved and assigned ν(BF),27 addition of water would make a blue shift of the peak structures in Figure 13.”

  Sun 等 - 2008 - Trace of the Interesting V-Shaped Dynamic Mechan DOI: 10.1021/jp806805r
• Acetate confidence 1.0

  “compound is the stretching band of C-O at 1297”

  Ali 等 - 2020 - New insight into single phase formation of capric DOI: 10.4314/tjpr.v19i2.19
• Alkyl C-H confidence 1.0

  “The N-H, C=C, C-C, and C-N vibrations centered at 3383, 1600, 1423, and 1297 cm-1, respectively, can be seen along with the C-H in plane and out of plane vibrations from the quinoid and benzenoid rings [22].”

  Purification and Glutaraldehyde Activation Study on HCl-Doped PVA–PANI Copolymers with Different Aniline Concentrations DOI: 10.3390/molecules24010063
• confidence 1.0

  “Explicit assignment: 'CC bridge bond stretch 1297'”

  Jiang XiaoXiang 等 - 2011 - Structure properties of pyrolytic lignin extracted DOI: 10.1007/s11434-011-4465-4
• Acetate confidence 1.0

  “[17] 1420 - CH 3) δ(CH 2 [18-19] 1369 2) δ(CH ν cr(C-O)andν cr(C-C)stretching in the crystalline 1297 [16-18]”

  Major-Gabrys 等 - 2017 - THE THERMAL AND STRUCTURAL ANALYSIS OF NEW BICOMPO DOI: 10.1515/amm-2017-0057