What absorbs at 713 cm⁻¹ in an FTIR spectrum?
A band near 713 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 713 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 |
|---|---|---|---|
| Carbonate | 13 | 13 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 0.9 |
| Nitrile | 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 |
|---|---|---|---|
| Nanotubes | 713, 1735, 1630 | Methacrylate, Methoxy (OCH3) | 1 |
| calcite | 713, 2850, 2864 | Carbonate, Methacrylate, Methoxy (OCH3) | 1 |
| apatite | 713, 3053, 1640 | Carbonate | 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 713 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
-
Hydroxyl (O-H) confidence 1.0
“The peak at 713 for O-H out-of-plane bending increased cm-1 remarkably.”
Surface modification of bacterial cellulose membrane by oxygen plasma treatment DOI: 10.1016/j.surfcoat.2016.06.035 -
confidence 1.0
“Fe3+ The FTIR data complement the Raman scattering data and Fe 2p (O h) 710.2 2.61 710.2 4.79 3/2 Fe3+/Fe2+ yield information on the vibrations originating from the 712.8 714.5 4.07 5.44”
Functionalized Self-Assembled Peptide Nanotubes with Cobalt Ferrite Nanoparticles for Applications in Organic Electronics DOI: 10.1021/acsanm.7b00344 -
Carbonate confidence 1.0
“Series: Materials Science and Engineering 1003 (2020) 012132 doi:10.1088/1757-899X/1003/1/012132 that FTIR ranges of the CaCo3/ ZnO fine particles, which were developed in the array of 4000 cm-1 to 400 cm-1.FTIR investigation establishes a”
Kumar 等 - 2020 - Synthesis of calcite-zincite nano composite materi DOI: 10.1088/1757-899X/1003/1/012132 -
Carbonate confidence 1.0
“4 cm(cid:2)1, peaks observed in synthetic calcite, probably due to the spines is fit to only one singlet band at 713 due to its cm(cid:2)1 occlusion of ACC and Mg ions to varying levels.”
Long 等 - 2012 - From synthetic to biogenic Mg-containing calcites DOI: 10.1039/c2cp22453d -
Carbonate confidence 1.0
“cm-1 The absorption peaks at 713, 730, and 877 are typical for the CO group [53,57,58], and the FTIR 3 analysis of pure crystalline calcite and dolomite confirms that these peaks are related to CaCO 3.”
Varrica 等 - 2019 - ATR-FTIR Spectral Analysis and Soluble Components DOI: 10.3390/ijerph16142507 -
Silicon (Si) confidence 1.0
“cm-1 cm-1 1033.11 is attributed to the stretching vibration of Si(Al)-O, the peak at 951.42 is cm-1 attributed to the stretching vibration of Si-O-Fe, the peak at 762.00 is attributed to the cm-1 stretching vibration of Si-Si, the peak at 7”
Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110 -
Carbonate confidence 1.0
“cm-1, The FTIR spectra of calcite showed absorption bands at 713 and 2521 indicating cm-1 the presence of calcite (Figure 11).”
Abdel-Halim 等 - 2023 - Apatite-Calcite Flotation Separation Using Sodium DOI: 10.3390/min13070970 -
Carbonate confidence 1.0
“cm-1 1538 and 1374 the valley in 877 and 713 cm-1 32are the characteristic absorption valley of CO in cm-1 carbonate minerals.”
Cui 等 - 2015 - Preparation of CaCO3-SiO2 composite with core-shel DOI: 10.1515/pjct-2015-0079
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