What absorbs at 1413 cm⁻¹ in an FTIR spectrum?
A band near 1413 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 1413 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 | 6 | 6 | 1.0 |
| Hydroxyl (O-H) | 5 | 5 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| C-O single bond | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Carboxyl (COOH) | 5 | 4 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| C=n | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Alkene (C=C) | 2 | 2 | 0.95 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Borate | 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 |
|---|---|---|---|
| chitosan | 1413, 1650, 1655 | Alkyl C-H, Methacrylate, Hydroxyl (O-H) | 1 |
| alginate | 1413, 1100, 1715 | Methacrylate, Alkyl C-H, Hydroxyl (O-H) | 1 |
| hydroxyapatite | 1413, 1620, 1639 | Hydroxyl (O-H), Alkyl C-H, Methacrylate | 1 |
| chitin | 1413, 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 1413 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
“From Figure 3a, it can be seen that the FTIR characteristics transmittance absorption peak at cm-1 at 1413 was attributed to C-O stretching, CH stretching, and C=O [51,52].”
Effect of Ratio in Ammonium Nitrate on the Structural, Microstructural, Magnetic, and AC Conductivity Properties of BaFe12O19 DOI: 10.3390/ma11112190 -
Acetate confidence 1.0
“TC-DO at 1412 and 779 W-DM had characteristic peaks at 1723 (C=O vibration), 1514, cm-1 corresponding to the characteristic peaks of TC-DM at 1643, 1465, 1413, 1456, 1422 and 775 cm-1.”
Discrimination and similarity evaluation of tissue-cultured and wild Dendrobium species using Fourier Transform Infrared Spectroscopy DOI: 10.1016/j.molstruc.2015.01.027 -
Hydroxyl (O-H) confidence 1.0
“of peak changes in wavenumber for alginate-GA in BBPEs system (cm-1) Assignments (functional group) Wavenumber GA ALGAALGAALGAALGAALGAALGAALGA0 1 2 3 4 5 6 - C-O-C 1025 1030 1031 1035 1035 1080 1081 stretching - - - - - - - 1074 C-O stretch”
Enhancing proton conductivity of sodium alginate doped with glycolic acid in bio-based polymer electrolytes system DOI: 10.1007/s10965-020-02142-0 -
Phosphate (PO4) confidence 1.0
“Bands 3-2 cm-1 correspond to -CO of n-HA and bands at 815, 962 and at 1461 and 1413 cm-1, respectively, are attributed to (P-C-P), (P-O) and (P=O) of phos1160 cm-1 phate group, whereas very weak bands around 3000 are attributed to the C-H a”
Preparation and characterization of aliphatic polyurethane and modified hydroxyapatite composites for bone tissue engineering DOI: 10.1007/s00289-019-03067-5 -
Alkyl C-H confidence 1.0
“cm-1 Other major bands detected were 1413 (CH ending and CH deformation),”
Antimicrobial Activity of Chemically and Biologically Treated Chitosan Prepared from Black Soldier Fly (Hermetia illucens) Pupal Shell Waste DOI: 10.3390/microorganisms9122417 -
Amide confidence 1.0
“The second peak (1413 cm-1) cm-1, may be related to C-N stretching and primary amide.”
Rafe 和 Razavi - 2015 - Effect of Thermal Treatment on Chemical Structure DOI: 10.1080/10942912.2014.999864 -
Carboxyl (COOH) confidence 1.0
“The peaks at 1467.51 cm-1 and 1412.72 cm-1 correspond to the symmetrical stretching vibration of -COO-.”
Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110 -
Alkyl C-H confidence 1.0
“In addition, a C=O peak observed at 1699 cm-1 cm-1, systems were at 2852 and 2939 corresponding to C-H symmetric and asymcm-1, in addition to a peak at 1413 cm-1, corresponded to the CH2 detected in all samples.”
Structural Conformation Comparison of Different Clear Aligner Systems: An In Vitro Study DOI: 10.3390/dj10050073
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.