What absorbs at 716 cm⁻¹ in an FTIR spectrum?
A band near 716 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 716 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) | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Alkene (C=C) | 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 |
|---|---|---|---|
| cellulose | 716, 1735, 1650 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| ZnO | 716, 1400, 3430 | Metal oxygen, Hydroxyl (O-H), Alkyl C-H | 1 |
| polyamide | 716, 1663, 1541 | 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 716 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
-
Acetate confidence 1.0
“In addition, the band located at 716 cm-1 was ascribed to the weak stretching of C=O, while 1144 cm-1 corresponded to the stretching asymmetric vibration of CN.”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Hydroxyl (O-H) confidence 1.0
“(b) Integral absorbance of 50mm), Fig.4.SequenceofIRspectraofcoesiteMA091(thickness asafunctionoftemperature,downto-180(cid:2)C.Thespectraareoffset the OH stretching bands of coesite FD0716 taken on a (010) plate as oftheorientationoftheEve”
Deon 等 - 2009 - Coupled boron and hydrogen incorporation in coesit DOI: 10.1127/0935-1221/2009/0021-1843 -
Alkyl C-H confidence 1.0
“stretching vibration of ring (768.45 vibration of CH (716.15 and 2 cm-1) bending vibration rings of C-H groups in phenolic compounds (628.80 (Silverstein & Bassler,”
Encapsulation of olive leaf phenolics within electrosprayed whey protein nanoparticles; production and characterization DOI: 10.1016/j.foodhyd.2019.105572 -
confidence 1.0
“También es posible observar bandas de un 2533, 1808, 1446, 870, and 716 cm-1, although bands from an compuesto de silicio no cristalino a 1110 (Si-O) y 924 cm-1 (C-O) organic molecule at 2945, 2889 (C-H), and 1034 cm-1 can be seen in and (S”
Fragoso 等 - 2010 - Characterization of the CaCO3 biomineral in corall DOI: 10.7773/cm.v36i1.1606 -
Alkyl C-H confidence 1.0
“cm-1, 2912 cm-1 and 2849 cm-1, corresponding to the alkyl C-H to the paraffin: at 2954 cm-1, cm-1 cm-1, belonging to the paraffin: at 2954 2912 and 2849 corresponding to the bonding vibrations, and at 1472 cm-1 and 716 cm-1 the deformation”
Study of Melamine-Formaldehyde/Phase Change Material Microcapsules for the Preparation of Polymer Films by Extrusion DOI: 10.3390/membranes12030266 -
confidence 1.0
“The peak at 716 cm-1 is attributed to the stretching corresponds to the Zn-O [26,28,29].”
Deposition of Zinc Oxide Coatings on Wood Surfaces Using the Solution Precursor Plasma Spraying Process DOI: 10.3390/coatings11020183 -
Alkyl C-H confidence 1.0
“LLM confirmed rule peak-group candidate”
Kallakas 等 - 2023 - Tensile and Surface Wettability Properties of the DOI: 10.3390/polym15122677 -
Metal oxygen confidence 1.0
“The sharp peak at 1531 metal oxide nanoparticles was found, and its bandwidth was 716.17 cm-1 demonstrates that the C=O molecule is vibrating symmetrically.”
Viswaksenan 等 - 2023 - Structural, morphological, and optical properties DOI: 10.15251/JOR.2023.194.351
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