What absorbs at 957 cm⁻¹ in an FTIR spectrum?
A band near 957 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 957 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 |
|---|---|---|---|
| Alkyl C-H | 5 | 5 | 1.0 |
| Hydroxyl (O-H) | 5 | 4 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Methyl | 2 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Borate | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 0.9 |
| Ring structure | 1 | 0 | 1.0 |
| C c single bond | 1 | 0 | 1.0 |
| Metal oxygen | 1 | 0 | 1.0 |
| Silanol (Si-OH) | 1 | 0 | 1.0 |
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 |
|---|---|---|---|
| SiO2 | 957, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Hydroxyl (O-H) | 1 |
| polydopamine | 957, 1543, 1707 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| graphene oxide | 957, 1150, 3400 | Hydroxyl (O-H), Alkyl C-H | 1 |
| GO | 957, 1720, 1182 | Hydroxyl (O-H), Alkyl C-H | 1 |
| nanoparticles | 957, 1732, 1647 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| hydroxyapatite | 957, 1620, 1639 | Phosphate (PO4), Hydroxyl (O-H), 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 957 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
-
Alkyl C-H confidence 1.0
“The bands at 956.69 is C-H bending cm-1 cm-1 (out of plane), at 1465.9 is C-H in plane bending (scissoring), at 2885 is C-H stretching cm-1”
Deswardani 等 - 2017 - Study of Structural and Magnetic Properties of Sil DOI: 10.1088/1757-899X/202/1/012047 -
Borate confidence 1.0
“cm-1 As suggested by reported literature, peak at 956.69 is caused by the presence of B-O stretching vibration of borate ion [70, 72, 74-76].”
Mahto 和 Mishra - 2022 - The removal of textile industrial Dye-RB-19 using DOI: 10.1007/s00289-021-03663-4 -
confidence 1.0
“For the BR spectrum (e), the D 2O-sensitive intense bands at 974 (+) (+) cm-1 and 957 were assigned as HOOP vibrations C15-H N-H (44), of and groups indicating that the”
Suzuki 等 - 2008 - Structural Changes of Salinibacter Sensory Rhodops DOI: 10.1021/bi801358b -
Alkyl C-H confidence 1.0
“cm(cid:3)1 cm(cid:3)1, Downloaded 2450 In the PDA-Pu spectrum, the weak band at 957 can be where stretching vibrations of the strongly bounded n C-H 22+ Commons ascribed to OH groups and bonds typically observed.”
High effectiveness of pure polydopamine in extraction of uranium and plutonium from groundwater and seawater DOI: 10.1039/c9ra06392g -
Acetate confidence 1.0
“the O-C asymmetric mode of the ester groups was observed at appeared at 1383 cm-1, cm-1 1088 and the peaks appeared at 957 and 913 were attributed to the rocking -1, mode of CH 3.”
Boudjema 等 - 2020 - Green composites based on Atriplex halimus fibers DOI: 10.1515/polyeng-2020-0068 -
Oxygen heterocycle confidence 1.0
“The slight vibrations at 1183 and 957 cm-1 correspond to epoxy groups (C-O), and”
Sustainable Remedy Waste to Generate SiO2 Functionalized on Graphene Oxide for Removal of U(VI) Ions DOI: 10.3390/su14052699 -
Hydroxyl (O-H) confidence 1.0
“at 957 cm-1 and 1033 cm-1, the internal hydroxyl band at 3230~3550 cm-1.”
Properties and Mechanism of Hydroxyapatite Coating Prepared by Electrodeposition on a Braid for Biodegradable Bone Scaffolds DOI: 10.3390/nano9050679 -
confidence 1.0
“The peak at 467 is the bending vibration bending vibration adsorption peak of Si-O-Si, and the peak at 957 cm-1 is the bending vibration cm-1 adsorption peak of Si-O-Si, and the peak at 957 is the bending vibration adsorption peak of adsorp”
Organic-Inorganic Hydrophobic Nanocomposite Film with a Core-Shell Structure DOI: 10.3390/ma9121021
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