What absorbs at 839 cm⁻¹ in an FTIR spectrum?
A band near 839 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 839 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 | 5 | 5 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Acetyl | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 0.9 |
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 |
|---|---|---|---|
| PVA | 839, 1660, 2930 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| PVP | 839, 2983, 1648 | Alkyl C-H, Methacrylate | 1 |
| SiO | 839, 800, 1745 | Methacrylate, Methoxy (OCH3), C-O single bond | 1 |
| CaO | 839, 2909, 1839 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| SiO2 | 839, 1739, 699 | Alkyl C-H, Methoxy (OCH3) | 1 |
| Al2O3 | 839, 1722, 1383 | Methacrylate, 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 839 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
-
Metal oxygen 置信度 1.0
“cm-1), cm-1), cm-1 (*1,037 (*913 AlAlOH AlMgOH *1,614 The shift of peak at in sample II to higher cm-1), (*839 deformation vibrations of Al-O-Si groups frequency is due to the existence of 2,4-DMP in protonated cm-1), cm-1) (*518 (*449 and”
Janik 等 - 2013 - Effect of different dimethylphenols on the interac DOI: 10.1007/s10973-013-2990-x -
Alkyl C-H 置信度 1.0
“Vials were subat 1524.26 cm-1, 1308.30 cm-1, and at 839.48 cm-1 was jected to mechanical shaking at 400 rpm for 24 h observed due to C-H stretching, C-C stretching and”
Batool 等 - 2019 - USE OF GLUTARIC ACID TO IMPROVE THE SOLUBILITY AND DOI: 10.32383/appdr/94246 -
C c single bond 置信度 1.0
“The fingerprint region of the IR absorption spectra (Figure 3a,b) reveals typical absorption bands The fingerprint region of the IR absorption spectra (Figure 3a,b) reveals typical absorption bands cm-1 of PVA, occurring at 839, 917 and 108”
Croitoru 等 - 2020 - Physically Crosslinked Poly (Vinyl Alcohol)Kappa- DOI: 10.3390/polym12030560 -
Alkyl C-H 置信度 1.0
“LLM confirmed rule peak-group candidate”
Elhosiny Ali 等 - 2022 - Microstructure Study and LinearNonlinear Optical DOI: 10.3390/polym14091741 -
C c single bond 置信度 1.0
“(cm-1) (cm-1) assignment observed wavelength for PVA observed wavelength for ZnS-PVA reference OH stretching 3280 3290 [20,21] CH2 asymmetric stretching 2917 2923 [20,21] C=O carbonyl stretching 1690 1718 [20-22] CH2 bending 1425 1430 [20,2”
Structural, optical, opto-thermal and thermal properties of ZnS–PVA nanofluids synthesized through a radiolytic approach DOI: 10.3762/bjnano.6.55 -
置信度 1.0
“Al-O4]5vibration of [AlO 28-29 - 791 778 770 772 Symmetric stretching 839 837 837 835 837 Stretching Si-O-Al vibration 29-30 Raman shift (cm-1)”
Kim 等 - 2013 - Viscous Behavior of Alumina Rich Calcium-Silicate DOI: 10.2355/isijinternational.53.170 -
Acetate 置信度 1.0
“β γ, δ ε Ar-O-), 1.80-1.75 (m, 4H, to Ar-O-), 1.48-1.38 (m, 10H, and to Ar-O-) 1,10-Bis[4-(pyreneiminomethylidene)-phenoxy]-decane cm-1): ν, FTIR (KBr, 3037 (=C-H stretch of the aromatic rings), 2922, 2850 (C-H stretch of aliphatic chains),”
Mesomorphic Behavior of Symmetric Azomethine Dimers Containing Different Chromophore Groups DOI: 10.3390/molecules26082183 -
Ring structure 置信度 1.0
“735-657cm-1isassignedtoamideorCH 2rockingband[18],839cm-1 cm-1 water,2890 is related tothe asymmetrically stretching vibration cm-1 C\\H C\\C of in a pyranoid ring, and the band at 3332 is attributed to the vibrations occurred due to ring b”
Polyethersulfone membrane embedded with amine functionalized microcrystalline cellulose DOI: 10.1016/j.ijbiomac.2020.09.017
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