What absorbs at 903 cm⁻¹ in an FTIR spectrum?
A band near 903 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 6 cited sources
Quick answer
A band near 903 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 |
|---|---|---|---|
| Phosphorus | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Oxygen heterocycle | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Nitrate | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1.0 |
| Methyl | 1 | 0 | 1.0 |
| Methoxy (OCH3) | 1 | 0 | 1.0 |
| Methacrylate | 1 | 0 | 1.0 |
| Acetate | 1 | 0 | 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 903 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
-
Ring structure 置信度 1.0
“6 here) cm-1 In the literature, the 903 band is assigned to ring C-H wagging and C-C”
Investigation on the overlapping bands of sydiotactic polystyrene by using 2D-IR spectroscopy DOI: 10.1016/j.molstruc.2016.03.103 -
Nitrate 置信度 1.0
“besides the main peaks at m/z = 422 and m/z = 842, AM1d quantum semiempirical method use the Schro¨dinger other peak clusters at m/z = 903 and m/z = 921 assigned Er]+ equation to determine geometry, bond strengths, atomic to the complexes [”
Przybylski 等 - 2008 - ESI MS, spectroscopic and semiempirical characteri DOI: 10.1016/j.molstruc.2007.07.039 -
Oxygen heterocycle 置信度 1.0
“appear at 878.8 From the viewpoint of photochemistry, it is instructive to This mode (due to the deformation of the oxirane three-membered ring) was assigned to the expericompare DGAn with other cyclic molecules with several single cm-1 men”
Jarmelo 等 - 2008 - Matrix-Isolated Diglycolic Anhydride Vibrational DOI: 10.1021/jp805603b -
Phosphate (PO4) 置信度 1.0
“distinct absorptions at 903, 988, 1032, and Spectral subtraction of these two spectra suggested that these phosphate absorptions were deeper in the bioreduced compared with the heated abiotic control spectrum.”
Kashyap 等 - 2023 - Spectral Detection of Nanophase Iron Minerals Prod DOI: 10.1089/ast.2022.0042 -
Amide 置信度 1.0
“940 cm-1 and 1169 cm-1 are C-N stretching vibrations of imidazole groups and C=N stretchThe absorption peak at 903 cm-1 originated from the epoxy group of the polymer, which ing vibrations at 1570 cm-1 [22].”
Design and Preparation of Imidazole Ionic Liquid-Based Magnetic Polymers and Its Adsorption on Sunset Yellow Dye DOI: 10.3390/ma15072628 -
Phosphate (PO4) 置信度 1.0
“results in the formation of a new phosphate peak at 903”
Narwade 和 Khairnar - 2017 - Cobalt adsorption on the nano-hydroxyapatite matri DOI: 10.1515/bpasts-2017-0016
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