What absorbs at 1468 cm⁻¹ in an FTIR spectrum?
A band near 1468 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 1468 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 | 17 | 15 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Secondary amine | 4 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 4 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Lipid | 3 | 3 | 1.0 |
| Methyl | 3 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Phosphorus | 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 |
|---|---|---|---|
| gold nanoparticles | 1468, 1638, 3252 | Alkyl C-H, Methacrylate, Acetate | 1 |
| asphalt | 1468, 1600, 1376 | 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 1468 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
-
C c single bond confidence 1.0
“In the DCNP, the bands observed in IR at 1468, 1340, 1304, and in IR and 1348, 1569cm(cid:2)1 cm(cid:2)1 1635 and 1309 and 1183 has been assigned to C-C stretching and in in Raman for DCNP and the band observed 1266cm(cid:2)1”
Arivazhagan 和 Rexalin - 2013 - Vibrational spectra, UV-vis spectral analysis and DOI: 10.1016/j.saa.2013.01.029 -
Alkyl C-H confidence 1.0
“The 1468 peak was correlated to CH bending vibrations of lipids.”
The Effect of High-Intensity Ultrasound and Natural Oils on the Extraction and Antioxidant Activity of Lycopene from Tomato (Solanum lycopersicum) Waste DOI: 10.3390/antiox11071404 -
Amide confidence 1.0
“ν δ(CH cm-1 s(CH 3) symmetric stretching, at 1467.72 for 2) ν(C-N)stretching at971.84cm-1for Mechanism for selective determination scissoringvibration,and CTA+”
Citrate-capped gold nanoparticles as a sensing probe for determination of cetyltrimethylammonium surfactant using FTIR spectroscopy and colorimetry DOI: 10.1007/s00216-019-02067-8 -
Alkyl C-H confidence 1.0
“As can be deduced, the absorption bands cm-1, cm-1 at 2919.3 and 2850 are caused by stretching vibration of aliphatic C-H cm-1, cm-1 cm-1 while the peaks at 1468 1445 and 1437 are identified as bending”
Liang 等 - 2017 - Thermo-stability and aging performance of modified DOI: 10.1016/j.matdes.2017.04.060 -
Alkyl C-H confidence 1.0
“(+) -CH3 2819 2816 stretching of H-C-H 1468 unclear 1465 unclear 1463 1461 1473 bending (-) (-) H-C-H 1388 1393 1388 1394 1380 1380 1381 bending”
Maeda - 2001 - IR spectroscopic study on the hydration and the ph DOI: 10.1021/la001346q -
Lipid confidence 1.0
“The band at ∼1468 represents hexagonal packing of the lipids, whereas C”
Mansour 等 - 2017 - Elucidation of penetration enhancement mechanism o DOI: 10.1016/j.saa.2017.05.026 -
confidence 1.0
“However, a slight shift for the peak at 1468 which is assigned to P the Ba ions in YBa 2Cu 3O can be observed for Ag 2O added samples.”
Suan 等 - 2017 - Effects of Ag2O nanoparticles addition on electric DOI: 10.1016/j.cjph.2017.08.012 -
N h confidence 1.0
“The presence of OLA group on CZTSe nanocrystals is indicated by NH bending modes at 909, 964 and 2 993cm-1, 1468cm-1, C-H bending mode at NH scissor mode at 2 1568cm-1 2955cm-1.”
Hot-injection synthesis and characterization of quaternary Cu2ZnSnSe4 nanocrystals DOI: 10.1016/j.matlet.2010.03.034
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