What absorbs at 913 cm⁻¹ in an FTIR spectrum?
A band near 913 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Quick answer
A band near 913 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
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Hydroxyl (O-H) | 9 | 8 | 1.0 |
| Alkyl C-H | 6 | 6 | 1.0 |
| Silicon-oxygen (Si-O) | 5 | 5 | 1.0 |
| Metal hydroxyl | 5 | 5 | 1.0 |
| Oxygen heterocycle | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Ring structure | 3 | 3 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| epoxy | 913, 1660, 1735 | Alkyl C-H | 2 |
| montmorillonite | 913, 1637, 523 | Hydroxyl (O-H), Silicon-oxygen (Si-O) | 1 |
| bentonite | 913, 882, 918 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Metal hydroxyl | 1 |
| kaolinite | 913, 3696, 693 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Metal hydroxyl | 1 |
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 913 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
-
Oxygen heterocycle confidence 1.0
“The FTIR of cured epoxy shows ring opening by the disappearance of oxirane ring peak at 913 whereas X-ray diffraction shows its amorphous phase in the cured state.”
Influence of amine‐terminated additives on thermal and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) cured epoxy DOI: 10.1002/app.48404 -
Acetate confidence 1.0
“With the stretching, 1141 to DNA phosphate symmetric stretchcm-1 cm-1 R D-ribose increasing time of the accumulation, the values gradually ing, 1049 to C - O stretching, 913 to”
Gallic acid-coated silver nanoparticles as perspective drug nanocarriers: bioanalytical study DOI: 10.1007/s00216-022-03955-2 -
Metal hydroxyl confidence 1.0
“cm-1, cm-1 cm-1 The peaks at 913.08 916.09 and 912.55 are responsible for Al-Al-OH group deformation and are cm-1 cm-1”
Preparation and characterization of adsorbents derived from bentonite and kaolin clays DOI: 10.1007/s13201-018-0827-2 -
Hydroxyl (O-H) confidence 1.0
“988.67 suggests OH deformation linked to the peak at 913.41 cm-1 can be cm-1, cm-1, assigned to C=C binding (alkane);”
Foliar Application of Nanoclay Promotes Potato (Solanum tuberosum L.) Growth and Induces Systemic Resistance against Potato Virus Y DOI: 10.3390/v14102151 -
Metal hydroxyl confidence 1.0
“The 913 band stems from the Al-Al-OH bending mode, the 793 cm-1 band indicates the presence of quartz, the 625 band stems from out-of-plane Al-O-Si cm-1”
Rehydration Driven Na-Activation of Bentonite—Evolution of the Clay Structure and Composition DOI: 10.3390/ma14247622 -
Metal hydroxyl confidence 1.0
“LLM confirmed rule peak-group candidate”
Interactions between kaolinite and phosphinate-based flame retardant in Polyamide 6 DOI: 10.1016/j.clay.2018.02.021 -
Hydroxyl (O-H) confidence 1.0
“cm-1 913 characterize free B15C5 in the spectrum of a 0.5mol/L solution of B15C5 in dinated B15C5 at 913 cm-1, 938 cm-1, and 984 cm-1 (Figures 15b and S5) decreased, the intensity of the ν(OH) bands in the range of 3700-3500 cm-1 decreased”
Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-BasedIonic Liquid DOI: 10.3390/molecules28030935 -
Amide confidence 1.0
“In Figure 3, comparisons focus on four characteristic The purpose of presenting Figure 3 is to discuss the curing reaction of EP resin, where (-OH, derived from carbonyl and epoxide ring opening), 1390 cm-1, 1777 peaks: 3500 cm-1 it is PAA”
Interpenetration Networked Polyimide–Epoxy Copolymer under Kinetic and Thermodynamic Control for Anticorrosion Coating DOI: 10.3390/polym15010243
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