What absorbs at 714 cm⁻¹ in an FTIR spectrum?
A band near 714 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 714 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 |
|---|---|---|---|
| Ring structure | 2 | 2 | 1.0 |
| Carbonate | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 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 |
|---|---|---|---|
| calcium carbonate | 714, 3232, 2954 | Alkyl C-H, Carbonate | 1 |
| SiO2 | 714, 1739, 699 | Alkyl C-H | 1 |
| PE | 714, 1414, 1700 | Alkyl C-H, Carbonyl (C=O) | 1 |
| cellulose | 714, 1735, 1650 | Alkyl C-H | 1 |
| silver nanoparticles | 714, 1636, 1631 | Alkyl C-H | 1 |
| calcite | 714, 2850, 2864 | Carbonate, Alkyl C-H | 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 714 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
-
Carbonate confidence 1.0
“Again, we mainly focus on two carbonate absorption 714 probably due to the existence of a very small bands, the out-of-plane bending mode amount of calcite in the geogenic dolomite.”
Long 等 - 2012 - From synthetic to biogenic Mg-containing calcites DOI: 10.1039/c2cp22453d -
C c single bond confidence 1.0
“Additionally, the weak band cm-1 at 714 may be due to C-C bending, which supports Wave number Functional group (cm-1)”
Basha 等 - 2016 - Effect of ultra graphite application on morphologi DOI: 10.18520/cs/v111/i12/2031-2035 -
Ring structure confidence 1.0
“Finally, the fingerprint zone of the PY Raman spectrum is dominated by the intense band at cm-1, 714 which is attributed to the ring-breathing mode [53].”
Vibrational Study (Raman, SERS, and IR) of Plant Gallnut Polyphenols Related to the Fabrication of Iron Gall Inks DOI: 10.3390/molecules27010279 -
Borate confidence 1.0
“The third cm-1 band positioned nearly at 714 refers to the bending of B-O-B in trigonal BO units and the last band at 3”
Structural, optical, and cytotoxicity studies of laser irradiated ZnO doped borate bioactive glasses DOI: 10.1038/s41598-023-34458-4 -
Alkyl C-H confidence 1.0
“LLM confirmed rule peak-group candidate”
Adhesive Hybrid SiO2.01C0.23Hx Nanoparticulate Coating on Polyethylene (PE) Separator by Roll-to-Roll Atmospheric Pressure Plasma DOI: 10.3390/coatings9030190 -
Carbonyl (C=O) confidence 1.0
“Additionally, a 1,714cm-1 3.2 FTIR analysis C]O assigned to of spectrum appeared at significant the carbonyl group.”
Mutiara 等 - 2022 - Facile route of synthesis of silver nanoparticles DOI: 10.1515/gps-2022-0038 -
Ring structure confidence 1.0
“(𝜈 cm-1 cm-1 cm-1 2) The IR bands at 708.47 and 761.38 𝑠NO and at 910.98 (ring stretching bands) are 𝛾-HMX.Thepeaksat713.88 (𝜈 cm-1,761.19 cm-1 cm-1 2) characteristicof 𝑠NO and1031 (ringstretching 𝛼-HMX.”
Thakur 等 - 2022 - SUPERCRITICAL ANTISOLVENT METHOD FOR RECRYSTALLIZA DOI: 10.24425/cpe.2022.140819 -
Carbonate confidence 0.9
“Text: 'distinct bands at 714 cm-1 (ν4)'”
Biomineralisation by earthworms – an investigation into the stability and distribution of amorphous calcium carbonate DOI: 10.1186/s12932-015-0019-z
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