What absorbs at 3235 cm⁻¹ in an FTIR spectrum?
A band near 3235 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 3235 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 |
|---|---|---|---|
| N h | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Amine primary | 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。
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 3235 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
-
Amine primary 置信度 1.0
“stretching band and centered at 3235 Primary amines N-H display asymmetrical and symmetrical stretching modes”
Organo-functionalized metal–oxide clusters: synthesis and characterization of the reduced cationic species [NaVIV6O6{(OCH2CH2)2NH}6]+ DOI: 10.1039/c4dt02174f -
N h 置信度 1.0
“FTIR spectra of sulfadimethoxine (HSDM), its sodium salt (NaSDM) and its Ag(I) complexes (AgSDM, cm-1 AgSDM-SCN and AgSDM-phen) in the wavenumber range of 4000-400 As shown in Table 1, the NH stretching of HSDM corresponds to the very stron”
Mosconi 等 - 2021 - Antifungal, phyto, cyto, genotoxic and lipophilic DOI: 10.1016/j.poly.2020.114965 -
Alkyl C-H 置信度 1.0
“Polymers 2022, 14, x FOR PEER REVIEW 12 of 20 Regarding the GAL-loaded NPs using HPC as a porous carbon matrix-carrier, in addition to the polymer (CS or Cys-CS) and the API characteristic FTIR vibrational peaks, several peaks corresponding”
L-Cysteine Modified Chitosan Nanoparticles and Carbon-Based Nanostructures for the Intranasal Delivery of Galantamine DOI: 10.3390/polym14194004
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