What absorbs at 907 cm⁻¹ in an FTIR spectrum?
A band near 907 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 907 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Oxygen heterocycle | 4 | 3 | 1.0 |
| Ring structure | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Metal hydroxyl | 2 | 2 | 1.0 |
| Silicon hydride | 2 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0.95 |
| Metal oxygen | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| glycerol | 907, 1585, 1630 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| clay | 907, 1736, 2855 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| calcium carbonate | 907, 3232, 2954 | Alkyl C-H, Hydroxyl (O-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 907 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.
Literature behind these assignments
-
confidence 1.0
“The peak at 907 observed only in HNT FTIR spectra is attributed to Al-OH bonding which does not appear in CTS (due to absence of Al) and also disappeared in CTS-Si/HNT nanocomposite due to the breaking of Al-OH bonding after when CTS-Si is”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
Silicon hydride confidence 1.0
“907cm-1 and at the due to SiH asymmetric the concentration in the plasma, three other independent 4 bending [15].”
Fourier-transformed infrared absorption spectroscopy: a tool to characterize the chemical composition of Ar--NH3--SiH4 dielectric barrier discharge DOI: 10.1088/0022-3727/46/46/464007 -
Alkyl C-H confidence 1.0
“combination or overtone bands can be seen in the range between (1671-1946 Morecm-1 over, three absorption bands at 1071, 1028, and 966 are related to (in-plane) bending, cm-1 while the other three bands at 907, 758, and 699 referred to (out”
Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372 -
Metal hydroxyl confidence 1.0
“The band at 1626 is attributable to the flexion of the H-OH cm-1 bonds of the structural water molecules and that at 907 to the bending vibrations of the Al-Al-OH cm-1 and Al-Mg-OH groups, indicating the presence of a smectite.”
Amri 等 - 2019 - Green Production of Glycerol Ketals with a Clay-Ba DOI: 10.3390/app9214488 -
C-S single bond confidence 1.0
“The Scm-1 cm-1, S-OH [15] and the C-S stretching peaks were obtained at 907 and 772 respec-”
Anis 等 - 2023 - Studies on Polybenzimidazole and Methanesulfonate DOI: 10.3390/polym15132821 -
Oxygen heterocycle confidence 1.0
“The absorbance peak at 907 of the isosorbide resin was assigned to the vibration of the epoxy rings that confirms the epoxidation of the isosorbide.”
Bellido-Aguilar 等 - 2019 - Effect of a fluoroalkyl-functional curing agent on DOI: 10.1016/j.surfcoat.2019.02.006 -
Hydroxyl (O-H) confidence 1.0
“cm-1 The band at wavenumber 907 corresponds to the O-H deformation of the internal”
Morphology and Selected Properties of Modified Potato Thermoplastic Starch DOI: 10.3390/polym15071762 -
Alkene (C=C) confidence 1.0
“particularly clear are the trans -CH=CHgroup vibrations butadiene at 963 cm-1), 907 cm-1 (=C-H out of plane bending of vinyl groups) and 697 cm-1 cm-1), cm-1 of butadiene at 963 907 (=C-H out of plane bending of vinyl groups) and”
Material Analysis and a Visual Guide of Degradation Phenomena in Historical Synthetic Polymers as Tools to Follow Ageing Processes in Industrial Heritage Collections DOI: 10.3390/polym14010121
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