What absorbs at 710 cm⁻¹ in an FTIR spectrum?
A band near 710 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 710 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 |
|---|---|---|---|
| Alkyl C-H | 9 | 6 | 1.0 |
| Silicon-oxygen (Si-O) | 5 | 5 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Carbohydrate | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Metal oxygen | 3 | 3 | 1.0 |
| Carbonate | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Hydrogen bond | 3 | 1 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Silicate | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Silicon carbon | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 0 | 1.0 |
| Nitrogen heterocycle | 1 | 0 | 1.0 |
| Alkene (C=C) | 1 | 0 | 1.0 |
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 |
|---|---|---|---|
| PE | 710, 1414, 1700 | Alkyl C-H, Methacrylate, Acetate | 1 |
| PP | 710, 1700, 1043 | Alkyl C-H, Methacrylate, Acetate | 1 |
| microplastics | 710, 1643, 1614 | Alkyl C-H, Methacrylate, Acetate | 1 |
| rGO | 710, 2358, 2930 | Methacrylate, Acetate, Alkyl C-H | 1 |
| Fe3O4 | 710, 2358, 1673 | Alkyl C-H, Methacrylate, Acetate | 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 710 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
-
Alkyl C-H confidence 1.0
“In cm-1 cm-1 particular, for PE at 710 and 719 (-CH rocking deformation), 2847 and 2915 particular, for PE at 710 and 719 cm-1 (-CH2 rocking deformation), 2847 and 2915 cm-1 (- 2 cm-1 (-CH symmetric and asymmetric stretching), 1462 and 1472”
Campanale 等 - 2023 - Fourier Transform Infrared Spectroscopy to Assess DOI: 10.3390/polym15040911 -
confidence 1.0
“In XPS spectra of Fe(2p)in Fe 3O 4/rGO nanocomposite, two peaks are locatedat 710.34 eV and 724.59 eV of the binding energy which attributes Fe-Fe.”
Devi 等 - 2020 - Investigation of chemical bonding and supercapacit DOI: 10.1016/j.diamond.2020.107756 -
Alkyl C-H confidence 1.0
“Finally, the authors found cm-1 a peak at 710 (associated by the out-of-plane vibration of cis-HC = CH group of disubstituted olefines as well as overlapping of CH rocking shaking) [97,98].”
Characterizing the Bioactive Ingredients in Sesame Oil Affected by Multiple Roasting Methods DOI: 10.3390/foods11152261 -
confidence 1.0
“The XPS peak at 710.4eV correspond to Fe 2p3/2 and at 4000e400 cm-1.”
Structural and magnetic properties of Gd-Zn substituted M-type Ba-Sr hexaferrites by sol-gel auto-combustion method DOI: 10.1016/j.jallcom.2019.06.348 -
C c single bond confidence 1.0
“3 tions.Thepeaksoccurringat710,590,550,540,460,450,390,350, 140cm-1 are due to C-C-C out of plane bending vibrations 230, 4.2.3.”
Nagabalalsubramanian 等 - 2009 - A scaled quantum mechanical approach of vibrationa DOI: 10.1016/j.saa.2009.10.002 -
Alkyl C-H confidence 1.0
“The increase of the IR peak at 2962 due to the asymmetrical C-H stretch mode in CH ligands and the 3 cm-1 appearance of a weak peak around 710 due to wagging N-”
Park 等 - 2016 - In-situ Monitoring System Equipped with FT-IR and DOI: 10.1149/07506.0123ecst -
Carbonate confidence 1.0
“They have been identified by their characteristic bands: calcite, ν3 stretch at 1406 and ν2 and ν4 deformation at 876 cm-1 and 710 cm-1 (see Figures 5d, S1, S3, S8, S10, S12, S16, S17, S19 and S25);”
New Insights into the Medieval Hispano-Muslim Panel Painting: The Alfarje Found in a Balearic Casal (Spain) DOI: 10.3390/molecules28031235 -
Silicon carbon confidence 1.0
“2g) were located at 490 (symmetric Si-O stretch vibration) of the cm-1 cm-1 Si-O-Si chain and 710 (symmetric C-Si-C stretch vibration) and 789 (antisymmetric C-Si-C stretch cm-1 vibration) of the CH 3-Si-CH moieties.”
Optical photothermal infrared spectroscopy with simultaneously acquired Raman spectroscopy for two-dimensional microplastic identification DOI: 10.1038/s41598-022-23318-2
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.