What absorbs at 1411 cm⁻¹ in an FTIR spectrum?
A band near 1411 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 1411 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 |
|---|---|---|---|
| Alkyl C-H | 10 | 6 | 1.0 |
| Methoxy (OCH3) | 7 | 7 | 1.0 |
| Methacrylate | 7 | 7 | 1.0 |
| C-O single bond | 7 | 7 | 1.0 |
| Acetate | 7 | 7 | 1.0 |
| Hydroxyl (O-H) | 6 | 6 | 1.0 |
| Carbonate | 4 | 4 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbohydrate | 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 |
|---|---|---|---|
| PVA | 1411, 1660, 2930 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| chitosan | 1411, 1650, 1655 | Alkyl C-H, Methacrylate, C-O single bond | 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 1411 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
-
Water (H2O) confidence 1.0
“The weak band at 1411 provides the presence of organic content the bending vibration of the adsorbed water molecule [35].”
Abuhimd 等 - 2020 - Influence of Magnesium Aluminate Nanoparticles on DOI: 10.3390/coatings10100968 -
confidence 1.0
“The presence of N-H deformation of secondary amines at 1552.30 O-H cm1, deformation of phenols was observed at 1411.31 S = O stretch was observed at the peak of”
Agrawal 等 - 2023 - Biotreatment of azo dye containing textile industr DOI: 10.21203/rs.3.rs-1876766/v2 -
Alkyl C-H confidence 1.0
“On the other hand, the peaks at 2939 cm-1, at 2939 and 2910 referring to the C-H elongation of the alkyl groups, and the peak and 2910 cm-1, referring to the C-H elongation of the alkyl groups, and the peak at 1411”
Chitosan/PVA Based Membranes Processed by Gamma Radiation as Scaffolding Materials for Skin Regeneration DOI: 10.3390/membranes11080561 -
confidence 1.0
“- - 1410-1510 asymmetric stretching 1411 CO Si-O-Si - - 1095-900 stretching 1066 1060 1050 1047”
Facile synthesis of novel calcium silicate hydrated-nylon 6/66 nanocomposites by solution mixing method DOI: 10.1039/c8ra07116k -
Acetate confidence 1.0
“The the data reported before [9], symmetric and asymmetric 1411cm-1 groups for is assigned to the symmetric stretching Cpeak at bending vibrations were observed on the CH 3 1454cm-1.”
Gallegos-Loya 等 - 2012 - An Optical Overview of Poly[mu(2)-L-alanine-mu(3)- DOI: 10.1100/2012/620189 -
Acetate confidence 1.0
“c for the modes involved C-O-H bending and C-O stretching, as we observed for the r ip 1411cm-1 cm-1 δ(C-OH) and 1385 ν(C-OH).”
Gu 等 - 2011 - Pentachlorophenol Radical Cations Generated on Fe( DOI: 10.1021/es103324z. -
Carbonate confidence 1.0
“In this spectrum, the In contrast, carbonate vibrations in calcite have two cm-1 cm-1 cm-1 absorption band of about 1411 is associated with significant absorption bands in 712 and 873 cm-1 the carbonate vibrations.”
Identification of pigments used in a Qajar manuscript from Iran by using atomic and molecular spectroscopy and technical photography methods DOI: 10.1186/s40494-022-00665-x -
Alkyl C-H confidence 1.0
“A peak at 1411 associated with COOstretchDespite removing mucus during the process of ing and C-H bending, was significantly increased in extracting cells from sputum we assumed that mucins cancer spectra relative to normal.”
Lewis 等 - 2010 - Evaluation of FTIR Spectroscopy as a diagnostic to DOI: 10.1186/1471-2407-10-640
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