What absorbs at 1498 cm⁻¹ in an FTIR spectrum?
A band near 1498 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 7 cited sources
Quick answer
A band near 1498 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 |
|---|---|---|---|
| Aromatic ring | 3 | 3 | 1.0 |
| Alkene (C=C) | 3 | 1 | 1.0 |
| Ring structure | 2 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Amino acid | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
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 1498 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
-
Aromatic ring confidence 1.0
“The presence of N-H deformation of secondary amines at 1552.30 O-H cm1, deformation of phenols was observed at 1411.31 S = O stretch was observed at the peak of cm1, cm1, cm1 1318.39 1211.21 1045.26 (supports that the dye contains the sulfo”
Agrawal 等 - 2023 - Biotreatment of azo dye containing textile industr DOI: 10.21203/rs.3.rs-1876766/v2 -
Aromatic ring confidence 1.0
“Gonçalves there is a high oxidant concentration (molar ratio aniband assigned to the benzenoid ring (frequency of 1495 to line/oxidant less than 2.0), the formation of oxidation 1498 cm-1, for this experiment).”
Carvalho Mazzeu 等 - 2018 - INFLUENCE OF REACTION TIME ON THE STRUCTURE OF POL DOI: 10.1590/0104-6632.20180351s1s20160201 -
confidence 1.0
“cm-1, which was due Furthermore, it is interesting to note that the relative intensity of the band at 1498 RNHCOOto N-H bending vibration of [54], decreased following the order: APTMS-SBA-15-ex > RNHCOOAEAPS-SBA-15-ex > TA-SBA-15-ex, indica”
Grafting of Amines on Ethanol-Extracted SBA-15 for CO2 Adsorption DOI: 10.3390/ma6030981 -
Hydroxyl (O-H) confidence 1.0
“-C-H 2013 bending in aromatic compound -H-bonded 1636 COOH stretching vibration -CC 1618 stretching vibration in benzenoid ring -O-H 1498 bending in the carboxylic acid -C-O 1314 stretching vibration Figure 3.”
Regasa 等 - 2020 - Development of Molecularly Imprinted Conducting Po DOI: 10.1021/acsomega.9b03747 -
Aromatic ring confidence 1.0
“The band at 1498 can be assigned C@C observed bands are due to the hydrolysis product, the to the stretching vibration of the aromatic ring, ARTICLE IN PRESS”
Salavagione 等 - 2004 - Spectroelectrochemical study of the oxidation of a DOI: 10.1016/j.jelechem.2003.11.005 -
Lipid confidence 1.0
“1498cm-1), in spectral regions linked to lipids/fatty acids carbohydrates glucose (1035cm-1), (1600cm-1;”
Sitole 等 - 2014 - Mid-ATR-FTIR Spectroscopic Profiling of HIVAIDS S DOI: 10.1089/omi.2013.0157 -
Alkene (C=C) confidence 1.0
“The negative band at 1498 with a shoulder near cm-1 1514 could be assigned to in-plane C=C-H bending and C=C stretching vibrations of the phenyl ring in the aromatic amino acids Phe and Tyr, respectively [40,42-44].”
Ex Vivo Vibration Spectroscopic Analysis of Colorectal Polyps for the Early Diagnosis of Colorectal Carcinoma DOI: 10.3390/diagnostics11112048
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