What absorbs at 1164 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1164 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 1164 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

• Aromatic ring confidence 1.0

  “3000cm-1 the region In the present case, the very strong rise to three bands above for aromatic C H and 1164cm-1 modes observed at 1289 and in IR corresponds to H stretching observed in the region between one aliphatic C 2900cm-1.”

  Arjunan 等 - 2007 - Fourier transform infrared and Raman spectral assi DOI: 10.1016/j.saa.2006.09.044
• Acetate confidence 1.0

  “(Figure 2B), which can be assigned to the C=O stretching in aliphatic and aromatic ester 1725 cm-1 (Figure 2B), which can be assigned to the C=O stretching in aliphatic and cm-1 groups, the peak at 1164 (Figure 2C), corresponding to the C-O”

  Cutinase-Catalyzed Polyester-Polyurethane Degradation: Elucidation of the Hydrolysis Mechanism DOI: 10.3390/polym14030411
• C c single bond confidence 1.0

  “Stretching and bending ](C-H) β-Sheet of amide III [59-61] 1239 δ(N-H), vibration ](C-C) 1164 δ(C-O),”

  Hssaini 等 - 2022 - Do Pollination and Pollen Sources Affect Fig Seed DOI: 10.1155/2022/3969165
• Alkyl C-H confidence 1.0

  “cm-1 741 (ring vibration due to 1,2-disubstituted benzene) cm-1 756 cm-1 2-HP-(cid:2)-CD, 3401 ( OH stretching) cm-1 2928 ( CH stretching) cm-1 (H O H bending) 1652 cm-1 (C H stretching) 1164”

  Telmisartan complex augments solubility, dissolution and drug delivery in prostate cancer cells DOI: 10.1016/j.carbpol.2013.09.077
• Acetate confidence 1.0

  “The 1164 peak related to the C-O stretching cm-1 or C-O-C of PBSe decreased with increasing DMT content and shifted from 1164 to 1169 [34,35].”

  Synthesis, Characterization and Properties of Biodegradable Poly(Butylene Sebacate-Co-terephthalate) DOI: 10.3390/polym12102389
• Acetate confidence 1.0

  “The peaks occurring at 1164 cm in bambara starches may be 338 attributed to coupling mode of C-O and C-C stretching, while peaks at 860 and 928 could be 339 attributed to C-O stretching.”

  Physicochemical properties of starches with variable amylose contents extracted from bambara groundnut genotypes DOI: 10.1016/j.carbpol.2015.06.100
• Acetate confidence 1.0

  “3 1318.40 -C-H Bending 1239.32 C-O stretch 1164.09 C-N stretch 1100.44 C-O stretch 1007.85 C-O stretch”

  Rahmawati 等 - 2017 - The Liquid Biodiesel Extracted From Pranajiwa (Ste DOI: 10.1063/1.4978098
• Acetate confidence 1.0

  “The cm-1 band at 1164 would be ascended from C-O-C asymmetric bridge stretching [38].”

  Cellulose‐reinforced starch biocomposite: optimization of the effects of filler and various plasticizers using Design‐Expert method DOI: 10.1002/star.202000028.