What absorbs at 3558 cm⁻¹ in an FTIR spectrum?
A band near 3558 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 3 cited sources
Quick answer
A band near 3558 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.
可能的官能团归属
| 官能团 | 支持性事实 | 引用来源 | 最高置信度 |
|---|---|---|---|
| Water (H2O) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
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 3558 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.
这些分配背后的文献
-
Carboxyl (COOH) 置信度 1.0
“At 280 °C, EVA lost an acetic acid group, and the absorption peaks of -OH/water (3735,3558 cm-1), C=O (1754 cm-1), and R-CH3 (1460 cm-1) appeared in the spectrogram.”
Enhancing Char Formation and Flame Retardancy of Ethylene-Vinyl Acetate Copolymer (EVA)/Aluminum Hydroxide (ATH) Composites by Grafting Ladder Phenyl/Vinyl Polysilsesquioxane (PhVPOSS) DOI: 10.3390/polym15153312 -
Water (H2O) 置信度 1.0
“XRD analysis besides Biotite (around the band at 3558 The remaining bands corresponded Bououdina,M.;Bellucci,S.Structural cm-1 cm-1, to absorbed and adsorbed water (3432 and 1629 respectively) and atmospheric CO 2 StudyofNano-ClayandIts cm-”
Structural Study of Nano-Clay and Its Effectiveness in Radiation Protection against X-rays DOI: 10.3390/nano12142332 -
置信度 1.0
“determined in the region between 3558 and 3615 from N-H stretching of secondary amines.”
Silva 等 - 2018 - FOURIER TRANSFORM INFRARED SPECTROSCOPY, THERMOGRA DOI: 10.21577/0100-4042.20170168
是否有此波段的光谱？
上传您的FTIR光谱，几秒钟内即可获得完整的解读报告——包含带文献引用的峰分配、库匹配和带有置信度评级的证据链。