What absorbs at 1714 cm⁻¹ in an FTIR spectrum?
A band near 1714 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 1714 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) | 32 | 24 | 1.0 |
| Carboxyl (COOH) | 19 | 18 | 1.0 |
| Methacrylate | 17 | 16 | 1.0 |
| Ketone | 17 | 16 | 1.0 |
| Amide | 17 | 16 | 1.0 |
| Acetate | 17 | 16 | 1.0 |
| Ester | 15 | 14 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Aldehyde (CHO) | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Imide | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 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 |
|---|---|---|---|
| cellulose | 1714, 1735, 1650 | Methacrylate | 1 |
| hemicellulose | 1714, 1730, 897 | Methacrylate, Carbonyl (C=O) | 1 |
| lignin | 1714, 1035, 1510 | Methacrylate | 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 1714 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
“Absorption bands below 2 cm-1 in Scheme 2, which was crystallographically characterized and 1670 are likely due to bidentate and monodentate bicarcm-1 has C O stretching frequencies of 1714 (R = OMe) and 1710 bonate species, respectively, s”
Gaur 等 - 2013 - CO oxidation studies over cluster-derived AuTiO2 DOI: 10.1016/j.cattod.2012.10.029 -
Acetate confidence 1.0
“The major peaks observed were at cm-1 cm-1 Characterizations 1714 for C=O stretching and 1475 for aromatic”
Ibrahim 等 - 2011 - A study of poly vinyl chloridepoly(butylene adipa DOI: 10.1007/s10965-010-9486-1 -
Acetate confidence 1.0
“The FTIR absorption peak at 1714 C=O stretching vibration indicates that the hydrolyzed TMSPM is corporate on the surface of the silica spheres.”
Kim 和 Kang - 2012 - Fabrication of large area photonic crystal with su DOI: 10.1117/12.930432 -
Acetate confidence 1.0
“cm-1 at 1750-1650 The peak at 1714 is related to the asymmetric C=O stretch.”
Kondratenko 等 - 2020 - Thioglycolic Acid FTIR Spectra on Ag2S Quantum Dot DOI: 10.3390/ma13040909 -
Carbonyl (C=O) confidence 1.0
“The AG had a molecular weight of acterized bya band at 1664 whereas carbonyl stretch of acid inCHOL-ALwasconfirmedbyabandat1714cm(cid:1)1Carbonylstretch reports.21 around 13 KDa as per the literature Increase in the mocm(cid:1)1.”
Cholesterol anchored arabinogalactan for asialoglycoprotein receptor targeting: synthesis, characterization, and proof of concept of hepatospecific delivery DOI: 10.1016/j.carres.2015.03.003 -
Carbohydrate confidence 1.0
“LLM confirmed rule peak-group candidate”
Solihat 等 - 2020 - Microwave assisted dilute organic acid pre-treatme DOI: 10.1088/1757-899X/935/1/012046 -
Carbonyl (C=O) confidence 1.0
“1548 (cid:238)(C 1) 1538 cm-1, the only carbonyl stretch band The band at 1714 reduced 2dO)”
Wille 等 - 2003 - Redox-triggered FTIR difference spectra of FAD in DOI: 10.1021/bi035219f -
Amide confidence 1.0
“In the FT-IR spectrum of starch nanoparticle for 400 nm prepared by cross-linking method, the Pre-proof cm-1 absorption peak at 1714 was the characteristic peak of secondary amide structure, which indicated that starch was obviously cross-l”
Xiao 等 - 2020 - Preparation and characterization of broken-rice st DOI: 10.1016/j.ijbiomac.2020.05.182
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