What absorbs at 1362 cm⁻¹ in an FTIR spectrum?
A band near 1362 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 1362 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 |
| Methacrylate | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Methyl | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 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 |
|---|---|---|---|
| ZnO | 1362, 1400, 3430 | Alkyl C-H, Acetate, Methacrylate | 1 |
| epoxy resin | 1362, 905, 1100 | Methacrylate, Acetate, Alkyl C-H | 1 |
| nanocomposite | 1362, 2921, 3300 | Alkyl C-H, Methacrylate, 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 1362 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
-
Alkyl C-H confidence 1.0
“In both cases the characteristic absorption bands are showed: 1509 and 1608 cm-1 (C=C bonds of aromatic ring), 1457 cm-1 (CH2 group vibration), 1362 cm-1 (methyl group vibration) and”
Barbadillo 等 - 2003 - Study of a curing reaction of an epoxy resin DOI: 10.4028/www.scientific.net/MSF.426-432.2163 -
Alkyl C-H confidence 1.0
“The strong peak at 1362 and also indiNH3+ torsion 486 twisting and CH wagging modes cates the identification of CH 2 2”
Caroline 等 - 2009 - Growth, optical, thermal and dielectric studies of DOI: 10.1016/j.matchemphys.2008.09.070 -
Carboxyl (COOH) confidence 1.0
“As the sample is cm-1 have heated above 500 K, the peaks at 1362 and 1387 cm-1 disappeared and two new peaks appear at 1352 and 1400 (Figure 6c, 590 K) indicative of the formate species undergoing (COO-) bound to the deprotonation to a carb”
Durand 等 - 2010 - Reaction of Formic Acid over Amorphous Manganese O DOI: 10.1021/jp104629j -
Hydroxyl (O-H) confidence 1.0
“1572 - OH-stretch - - 1362”
Green Synthesis, Structural Characterization and Photocatalytic Activities of Chitosan-ZnO Nano‐composite DOI: 10.1007/s10904-021-01988-1 -
Ring structure confidence 1.0
“the peak at 1362cm(cid:1)1 C¼C signposts the occurrence of polyphenols Ar-ring stretching vibration”
Removal of caffeine from aqueous solution by green approach using Ficus Benjamina zero-valent iron/copper nanoparticles DOI: 10.1177/0263617420947495 -
Acetate confidence 1.0
“The 1362 and 1320 cm-1 bands were attributed to O-C=O stretching vibration absorption bands of oxalates.”
Multi-Method Analysis of Painting Materials in Murals of the North Mosque (Linqing, China) DOI: 10.3390/coatings13071298 -
Acetate confidence 1.0
“Band at 1651 corresponds to symmetric C =O stretching mode that is highly intensified with increasing loading percentage of magnesium nitrate, while ~ 1362 cm-1 band corresponds to asymmetric C-O stretching mode.”
Doping of Mg on ZnO Nanorods Demonstrated Improved Photocatalytic Degradation and Antimicrobial Potential with Molecular Docking Analysis DOI: 10.1186/s11671-021-03537-8 -
Alkyl C-H confidence 1.0
“saturated C-H deformation vibration w 1362 -NO2 stretching vibration peaks of aliphatic compounds w 1237 C-O stretching vibration peak in amides”
The analysis and identification of charred suspected tea remains unearthed from Warring State Period Tomb DOI: 10.1038/s41598-021-95393-w
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