What absorbs at 1415 cm⁻¹ in an FTIR spectrum?
A band near 1415 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 1415 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 |
|---|---|---|---|
| Carboxyl (COOH) | 10 | 9 | 1.0 |
| Hydroxyl (O-H) | 8 | 8 | 1.0 |
| Carbonate | 6 | 5 | 1.0 |
| Amide | 5 | 5 | 1.0 |
| Aromatic ring | 5 | 5 | 1.0 |
| Secondary amine | 5 | 5 | 1.0 |
| Acetate | 5 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| C n single bond | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Ring structure | 3 | 3 | 1.0 |
| N h | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| N n bond | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
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 1415 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
-
Amide confidence 1.0
“The C-N stretching vibration near 1415 is”
Luan 等 - 2020 - Spectral characteristics on increasing hydrophilic DOI: 10.1016/j.saa.2020.118350 -
Amide confidence 1.0
“The C-N vibration peaks at 1415.31 and 1418.96 appear due to primary amines of DG1 (alone) and electrocoagulated flocs residue.”
Sakthisharmila 等 - 2017 - A characteristic study on generation and interacti DOI: 10.1016/j.molliq.2017.01.106 -
N h confidence 1.0
“In the present work, the spectral study of the solutions prepared using NH 4VO 3 497cm(cid:2)1 salt shows 4 strong (broad and sharp) absorption bands at 1415, 915, 843 and”
Verma 和 Deb - 2012 - Determination of vanadium (V) employing a new comb DOI: 10.1080/03067310903410998 -
Alkene (C=C) confidence 1.0
“The peak at 1597 in the spectra for tensile fatigue aging can be assigned to the stretching vibration absorption of the double bond of conjugated cm21 dienes, and the peaks at 1415 and 1015 can be assigned to the in-plane and out-of-plane b”
Effects of hot-air aging and dynamic fatigue on the structure and dynamic viscoelastic properties of unfilled natural rubber vulcanizates DOI: 10.1002/app.27216 -
Hydroxyl (O-H) confidence 1.0
“In addition, temperature, the mixtures were turbid which the O-H bend modes are typically presented at indicates partial solidification of capric acid cm-1 1415 cm-1 and 932 bands.”
Ali 等 - 2020 - New insight into single phase formation of capric DOI: 10.4314/tjpr.v19i2.19 -
Acetate confidence 1.0
“likely because of its close proximity to the acetate band at 1415cm(cid:1)1.”
Enhancement of ethanol oxidation on Pd nanoparticles supported on carbon-antimony tin oxide hybrids unveils the relevance of electronic effects DOI: 10.1016/j.jcat.2017.02.002 -
N n bond confidence 1.0
“Aromatic C-H stretching vibration of an azo-based polymer, an N N bond appeared at 1415 cm-1.”
Ashraf 等 - 2014 - Preparation and properties of multilayered polymer DOI: 10.1515/polyeng-2013-0297 -
Hydroxyl (O-H) confidence 1.0
“Another cm-1 cm-1 -OH peak at ~1415 and 1075 referred to vibrations of and C=O, respectively.”
Fabrication, Structural Properties, and Electrical Characterization of Polymer Nanocomposite Materials for Dielectric Applications DOI: 10.3390/polym15143067
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