What absorbs at 1712 cm⁻¹ in an FTIR spectrum?
A band near 1712 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 1712 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 |
|---|---|---|---|
| Carbonyl (C=O) | 27 | 22 | 1.0 |
| Carboxyl (COOH) | 23 | 20 | 1.0 |
| Methacrylate | 16 | 15 | 1.0 |
| Acetate | 16 | 15 | 1.0 |
| Amide | 15 | 14 | 1.0 |
| Ketone | 14 | 13 | 1.0 |
| Ester | 14 | 13 | 1.0 |
| Alkyl C-H | 6 | 6 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Alkene (C=C) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| N-O bond | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Urethane | 1 | 1 | 1.0 |
| Hydrogen bond | 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 |
|---|---|---|---|
| DNA | 1712, 1660, 970 | Methacrylate, Acetate, Carbonyl (C=O) | 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 1712 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
“The modification process made with Agsbox caused sigcm-1 Statistical analysis nificantchangesinthisregion.Thebandat1712 (4) indicating an unconjugated C=O stretch in the A descriptive analysis was developed (mean and xylan.”
Physical, biological and chemical characterisation of wood treated with silver nanoparticles DOI: 10.1007/s10570-019-02416-x -
Hydroxyl (O-H) confidence 1.0
“O-H stretching vibration C=O 1712 1715 C=O stretching vibration O-H”
Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260 -
Carboxyl (COOH) confidence 1.0
“N stretching behavior can be shown by a peak at In addition, the presence of IR cm-1 peak at 1712 indicates the signatures of capping agent, oleic acid bounded to the surface of Mn-doped CdSe QDs.”
Raman Spectroscopy and FTIR Spectroscopy Studies of Mn-doped CdSe QDs at Different Particles Size DOI: 10.1016/j.ijleo.2018.10.214 -
Acetate confidence 1.0
“C=Ostretching 1712 1711 [19,21,23,24] Thymine C=O stretching 1712 1711 [19,21,23,24] Thymine C=Ostretching”
Han 等 - 2018 - Insight into Rapid DNA-Specific Identification of DOI: 10.3390/molecules23112842 -
Carbonyl (C=O) confidence 1.0
“1802, 1773 1801, 1771 1802, 1773 1801, 1772 Carbonyl group stretching 1712 1719 1719 1720”
Imperiyka 等 - 2014 - Preparation and Characterization of Polymer Electr DOI: 10.1155/2014/638279 -
Acetate confidence 1.0
“The 14 cm-1 peaks at 1712 and 1644 correspond to the free C=O products [17, 21] and 15”
A study of molecular architectural dynamics of crosslinked urethane during photo-aging by two-dimensional infrared correlation spectroscopy DOI: 10.1016/j.polymdegradstab.2020.109242 -
Ring structure confidence 1.0
“Such intensification of the cm-1 and a single prominent band appeared at 1712 chlorin ring bands of neutral Chl are unusual and have not cm-1 (Figure 2c).”
Okubo 等 - 2007 - Perturbation of the structure of P680 and the char DOI: 10.1021/bi700157n -
Acetate confidence 1.0
“C=O stretch or C-O vibration, while the peak at 1026 cm-1 Peaks located in 1712 and 1559 are the result of can be associated with C-O stretch or O-H vibration band stretching C=O in aliphatic ketones and/or C=C vibration in [23, 37, 39].”
CO2 adsorption of bagasse waste feedstock using thermogravimetric analyses DOI: 10.1007/s10973-021-10949-2
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