What absorbs at 3098 cm⁻¹ in an FTIR spectrum?
A band near 3098 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 3098 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.
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| N h | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Possible materials
| Material | Picos de suporte | Overlapping groups | Fontes citadas |
|---|---|---|---|
| hydroxyapatite | 3098, 1620, 1639 | Hydroxyl (O-H), Alkyl C-H | 1 |
| CS | 3098, 1645, 1720 | Hydroxyl (O-H), Alkyl C-H | 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 3098 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.
Literatura por trás destas atribuições
-
Alkyl C-H confiança 1,0
“It isevidentthatseveralcharacteristicabsorptionbandsat3202(NH stretching), 3098, 2928, 2871 (CH stretching), 2845, 1699 (C O stretchingcyclic),1678,1492,1452(CHbending),1420,1379,1330 cm-1 were observed in the IR spectra of and 1273 (CN str”
Hsu 和 Lin - 2009 - Rapid examination of the kinetic process of intram DOI: 10.1016/j.tca.2008.12.008 -
confiança 1,0
“3 (in the case of H [N]-GaAsN), with an increasing annealing temperature, the integrated peak intensity 3098cm(cid:2)1 of the peak (I 3098) attributed to N-H complexes decm(cid:2)1 creased, while that of the 3125 peak (I 3125) exhibited an”
Relation between N⠍H complexes and electrical properties of GaAsN determined by H implantation DOI: 10.1016/j.cap.2010.02.026 -
confiança 1,0
“960cm(cid:2)1 around The absorption peak around is suggested to be the wagging mode of the N-H, where the stretch mode is 3098cm(cid:2)1.”
Nishimura 等 - 2007 - Electrical properties of GaAsN film grown by chemi DOI: 10.1016/j.physb.2007.08.183 -
Alkyl C-H confiança 1,0
“The Intensity cm-1 (c) peak at 3098 was related to C-H aromatic stretching.”
Radiation Synthesis of Edible Coating Films of Nanocurcumin Based on Carboxymethyl Chitosan/Polyvinyl Alcohol to Extend the Shelf Life of Sweet Orange "Valencia" DOI: 10.1007/s10924-023-02854-6 -
Water (H2O) confiança 1,0
“At 3098 and 3070 cm-1 cm-1 and at 3220 are related to the absorbed water and are assigned to the O-H 3414 stretch of the hydrogen-bonded O-H groups intramolecular and intermolecular, respectively.”
Gomes 等 - 2007 - Characterization of partially sulfonated polyoxadi DOI: 10.1016/j.memsci.2007.02.046 -
confiança 1,0
“Explicit assignment: 'bands at 3483 and 3098 are related to free absorbed water'”
Perju 等 - 2022 - SOME ASPECTS CONCERNING TITANIUM COVERAGE WITH HYD DOI: 10.24425/amm.2022.137785 -
Alkyl C-H confiança 1,0
“LLM confirmed rule peak-group candidate”
Xu 等 - 2019 - Effect of the Ratio of Acetylacetate Groups on the DOI: 10.1021/acsomega.9b01234 -
confiança 0,8
“Listed as one of four stretching peaks.”
Ohshita 等 - 2014 - N-H related defects in GaAsN grown through chemica DOI: 10.7567/JJAP.53.031001
Tem um espectro com esta banda?
Carregue seu espectro FTIR e obtenha um relatório de interpretação completo — atribuições de picos com citações da literatura, correspondências de biblioteca e uma cadeia de evidências com nível de confiança — em segundos.