What absorbs at 1414 cm⁻¹ in an FTIR spectrum?
A band near 1414 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 1414 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 | 9 | 7 | 1.0 |
| Hydroxyl (O-H) | 8 | 6 | 1.0 |
| Carboxyl (COOH) | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Phosphate (PO4) | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbonate | 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 |
|---|---|---|---|
| polystyrene | 1414, 1020, 1600 | Alkyl C-H, Acetate, Hydroxyl (O-H) | 1 |
| PVDF | 1414, 1160, 840 | Alkyl C-H, Acetate | 1 |
| glycerol | 1414, 1585, 1630 | Acetate, Alkyl C-H, Hydroxyl (O-H) | 1 |
| hydroxyapatite | 1414, 1620, 1639 | Hydroxyl (O-H), Alkyl C-H, Acetate | 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 1414 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
-
confidence 1.0
“Assigned to β-phase in text.”
Spectroscopic and thermal investigations of poly(vinylidene fluoride) films composites with LaNi3Co2 DOI: 10.1002/crat.200610789 -
Water (H2O) confidence 1.0
“The band at 2850.31 cm-1 attributed to H-C-H stretching (alkyl, aliphatic), 1623.65 cm-1 corresponded to OH-fibers (water absorption), and 1414.47 cm-1 was vibrations of HCH and OCH bonds (methyl groups).”
Preparation and Characterization of Sound-Absorbent Based on Polystyrene Reinforced Primary Sludge and Fly Ash from Pulp Mill DOI: 10.14716/ijtech.v14i3.5131 -
Phosphate (PO4) confidence 1.0
“stretching Carbonate group 1413.82 CO3 In the present analysis, hydroxyapatite was extracted from the 634.58 PO4 bending Phosphate group P@S bones of two chicken varieties such as Black Sumatra and Fighting 601.79 Stretching Phosphate group”
Spectral characterization of hydroxyapatite extracted from Black Sumatra and Fighting cock bone samples: A comparative analysis DOI: 10.1016/j.sjbs.2020.11.020 -
Carboxyl (COOH) confidence 1.0
“The observed absorption cm-1 1566.27cm-1 bands at 1414.18 and are due to the presence of the carboxylate group (COO-) and correspond to the symmetric stretching and asymmetric stretching vibrations of the C-O band in the acetate group, resp”
Electrodeposition and characterization of Cu2O thin films using sodium thiosulfate as an additive for photovoltaic solar cells DOI: 10.1016/j.cjche.2017.06.023 -
Hydroxyl (O-H) confidence 1.0
“cm(cid:1)1 cm(cid:1)1 -OH absorption peaks at 1414 show bending, 1205 23 The values of the number of binding sites (n) and the asso-”
Multi-spectroscopic monitoring of molecular interactions between an amino acid-functionalized ionic liquid and potential anti-Alzheimer's drugs DOI: 10.1039/d0ra06323a -
Fatty acid confidence 1.0
“for the nanoparticles with and without Salmonella at 1454, 1414cm-1, However,manyreportsindicatedthatinherentcharacterand which is the mixed region of fatty acid bendisticsofnanoparticlescouldleadtovariabilityofreproducibiling vibration, pr”
Sukprasert 等 - 2020 - Synchrotron FTIR Light Reveals Signal Changes of B DOI: 10.1155/2020/6149713 -
confidence 1.0
“cm-1 and 972.06 The band at 3452.34 assigned to the hydroxyl (-OH) group whereas the band at cm-1 1413.72 is correspond to Ca-O.”
Wardhani 等 - 2018 - Synthesis of Hydroxyapatite using Precipitated Cal DOI: 10.1088/1757-899X/299/1/012035 -
Acetate confidence 1.0
“Other prominent peaks of pure glyccm-1 cm-1 erol include C-O-H around 1414 and the C-O stretch around 1029 [34,35].”
Adam 等 - 2023 - Insight into the Effect of Glycerol on Dielectric DOI: 10.3390/molecules28083461
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