What absorbs at 1465 cm⁻¹ in an FTIR spectrum?
A band near 1465 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 1465 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 | 50 | 43 | 1.0 |
| Methacrylate | 7 | 6 | 1.0 |
| Acetate | 7 | 6 | 1.0 |
| Amide | 5 | 5 | 1.0 |
| Methoxy (OCH3) | 5 | 4 | 1.0 |
| Secondary amine | 5 | 4 | 1.0 |
| Aromatic ring | 5 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 4 | 1.0 |
| C c single bond | 4 | 4 | 1.0 |
| Carbonyl (C=O) | 4 | 4 | 1.0 |
| Lipid | 4 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Methyl | 3 | 2 | 1.0 |
| Alkene (C=C) | 3 | 2 | 1.0 |
| Hydrogen bond | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| N h | 2 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Aldehyde (CHO) | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Triglyceride | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 0.9 |
| Hydroxyl (O-H) | 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 |
|---|---|---|---|
| oil | 1465, 1161, 1163 | 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 1465 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
“and (iii) the CH absorption of bending cm-1, cm-1 vibrations CH and CH bands were clearly seen in the region of 1465 while the band at 723”
Monitoring Enzymatic Hydroesterification of Low-Cost Feedstocks by Fourier Transform InfraRed Spectroscopy DOI: 10.3390/catal9060535 -
Alkyl C-H confidence 1.0
“Cell lipids show a band at 1465 for CH bending mode, a band at 2 cm-1”
Gupta 等 - 2022 - In vitro cell composition identification of wood d DOI: 10.1098/rsos.201935 -
Alkyl C-H confidence 1.0
“-C@O 1711a (acid) Stretching 1465b 6 1486-1446 -C-H (CH2) Bending (scissoring) 1450b 7 1446-1425 -C-H (CH3)”
Rapid evaluation of oxidised fatty acid concentration in virgin olive oil using Fourier-transform infrared spectroscopy and multiple linear regression DOI: 10.1016/j.foodchem.2010.06.054 -
Amide confidence 1.0
“2919cm-1 teristic peaks were at 1778 and amide A), (C-H asymmetric and symmetric 1654cm-1 2851cm-1 In this case, the peak at about stretching vibration), was the imine (C-H asymmetric and sym1652cm-1 bond (C=N), which could be ascribed as t”
Sukprasert 等 - 2020 - Synchrotron FTIR Light Reveals Signal Changes of B DOI: 10.1155/2020/6149713 -
Alkyl C-H confidence 1.0
“C-- and 1 (cis-olefins C (ester) stretching vibration), a small peak at 1651 cm(cid:0) 1 (cid:0)0.984** stretching vibration), peak at 1465 (designated to bending vibraunroasted Value, cm(cid:0) PUFAs -C-H -C-H 1 tion of (CH2)), a small pea”
Impact of microwave roasting on physicochemical properties, maillard reaction products, antioxidant activity and oxidative stability of nigella seed (Nigella sativa L.) oil DOI: 10.1016/j.foodchem.2021.130777 -
Alkene (C=C) confidence 1.0
“The peaks observed at 3008, 2929 and 2854 represents the region of hydrogen bond stretching of the functional groups, peaks detected at cm-1 1745 and 1651 are attributed to the region of double bonds stretching of functional cm-1 groups, pe”
Impact of infrared and dry air roasting on the oxidative stability, fatty acid composition, Maillard reaction products and other chemical properties of black cumin (Nigella sativa L.) seed oil DOI: 10.1016/j.foodchem.2019.05.140 -
C c single bond confidence 1.0
“They reported that FTIR spectra of the allicin extract demonstrate similar pattern of their functional groups, and the mode assignments of cm-1, S-H at 2382 cm-1, C=C at 1648 cm-1 and C-C at 1465 cm-1.”
Tasci 等 - 2016 - Determination of alliin and allicin in the plant o DOI: 10.17660/ActaHortic.2016.1143.19 -
Alkyl C-H confidence 1.0
“Aliphatic CH bending vibration”
Zhao 等 - 2015 - Discrimination of Adulterated Sesame Oil Using Mid DOI: 10.1007/s12161-015-0125-7
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