What absorbs at 1339 cm⁻¹ in an FTIR spectrum?
A band near 1339 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 1339 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 |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Phospholipid | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Protein alpha helix | 1 | 1 | 0.8 |
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
| 材料 | 支持峰 | Overlapping groups | 引用来源 |
|---|---|---|---|
| Fe3O4 | 1339, 2358, 1673 | Alkyl C-H, N h | 1 |
| nanoparticles | 1339, 1732, 1647 | Alkyl C-H | 1 |
| Fe3O4 nanoparticles | 1339, 1673, 1470 | Alkyl C-H, N h | 1 |
| ZnO | 1339, 1400, 3430 | 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 1339 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
-
Acetate 置信度 1.0
“The obtained data is in agreement with the Qingbo et al research on gastric cancer spectra, indicted the band at 1457 cm-1 is symmetric and asymmetric CH3 bending of the methyl groups of lipid, protein, nucleic cm-1 acid, respectively, and”
Ghassemi 等 - 2021 - Diagnosis of normal and malignant human gastric ti DOI: 10.1016/j.molstruc.2020.129493 -
Alkyl C-H 置信度 1.0
“1380-1200 1380-1200 1380-1200 1380-1200 CH wagging [36-40] 2 Collagen CH vibration 1339”
Detection of Human Cholangiocarcinoma Markers in Serum Using Infrared Spectroscopy DOI: 10.3390/cancers13205109 -
Phospholipid 置信度 1.0
“(PO2-) 1458 and 1396 The phosphodiester groups arise lipids arises at 1462 cm-1, cm-1,1174 cm-1 cm-1, 1233 and 1079 which from phospholipids bands at 1339”
Toxicity mechanism of Cu2+ ion individually and in combination with Zn2+ ion in characterizing the molecular changes of Staphylococcus aureus studied using FTIR coupled with chemometric analysis DOI: 10.1007/s10867-020-09560-7 -
Alkyl C-H 置信度 1.0
“cm-1 C-C and C-O stretching exhibited the peak at 1148 However, the peak at 1339 of the infrared wavenumbers indicated CH bending modes [61].”
Extraction and Characterization of Potential Biodegradable Materials Based on Dioscorea hispida Tubers DOI: 10.3390/polym13040584 -
Amide 置信度 1.0
“The bands in 1339 and 1596 were due to the C-N and R-NH bonds, respectively.”
Silveira 等 - 2021 - DOI: 10.1590/0366-69132021673833101 -
置信度 1.0
“Thus, the kinetic analysis was carried out only considering by much more intensified signals of surface-adsorbed species: the plasma CO hydrogenation in the presence of ZnO and 2 cm-1 the peaks at 1339 and 1304 are assigned to the adsorbed”
Sun 等 - 2022 - Plasma-Catalytic CO2 Hydrogenation over a PdZnO C DOI: 10.1021/jacsau.2c00028 -
Alkyl C-H 置信度 1.0
“cm-1), cm-1), cm-1) (1778 esters (1730 and the C-H, =CHbanding group (1339 were cm-1) cm-1) and C-H vinyl group (3013-3016 cm-1) were identified in stage b.”
Wzorek 等 - 2021 - Thermal Decomposition of Olive-Mill Byproducts A DOI: 10.3390/en14144123 -
Protein alpha helix 置信度 0.8
“Text mentions 'bands (1339 and 1317) ... α-helix'.”
Thermally induced gluten modification observed with rheology and spectroscopies DOI: 10.1016/j.ijbiomac.2021.01.008
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