What absorbs at 1071 cm⁻¹ in an FTIR spectrum?
A band near 1071 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 1071 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 |
|---|---|---|---|
| C-O single bond | 7 | 7 | 1.0 |
| Methoxy (OCH3) | 6 | 6 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Ring structure | 2 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Sulfonate | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 0.7 |
| Metal oxygen | 1 | 1 | 0.7 |
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 |
|---|---|---|---|
| magnetite | 1071, 1740, 1263 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| cotton | 1071, 1030, 1638 | Methacrylate, Acetate, C-O single bond | 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 1071 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
-
Ring structure confidence 1.0
“cm(cid:2)1 1158 The small peak at 1866 was assigned for C]O vibration.64,115-118 stretching The peaks at 1071, 970 and s where represents ionic conductivity, E activation energy, R a cm(cid:2)1 891 were designated for ring stretching/ring b”
Electrocatalytic and structural properties and computational calculation of PAN-EC-PC-TPAI-I2 gel polymer electrolytes for dye sensitized solar cell application DOI: 10.1039/d1ra01983j -
Amide confidence 1.0
“The peak at 1071 is assigned to the and amide groups.”
Phycoremediation of lithium ions from aqueous solutions using free and immobilized freshwater green alga Oocystis solitaria: mathematical modeling for bioprocess optimization DOI: 10.1007/s11356-019-05214-x -
Alkene (C=C) confidence 1.0
“Hemodialysis memof sulfur-oxygen double bond while the peak at 1071 cm rebrane could also take advantage of advanced imaging techniques flects the symmetric stretching vibration type of the same bond -1 through platelet counts, specific bio”
A case study of poly (aryl ether sulfone) hemodialysis membrane interactions with human blood: Molecular dynamics simulation and experimental analyses DOI: 10.1016/j.cmpb.2020.105742 -
Silicon (Si) confidence 1.0
“The peak at 1070.76 is attributed to stretching vibration of Si-O, the peak at cm-1 cm-1 1033.11 is attributed to the stretching vibration of Si(Al)-O, the peak at 951.42 is”
Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110 -
C-O single bond confidence 1.0
“ν(COC) ring breathing 1094 s ν(COC) glycosidic link, asymmetric stretching 1071 vw ν(CO) 1057 w”
Adebajo 等 - 2006 - Raman spectroscopic investigation of acetylation o DOI: 10.1016/j.saa.2005.07.045 -
Nucleic acid confidence 1.0
“cm-1 ester carbonyl C=O, (ii) bands at 1380-1200 and 1034 from collagen, (iii) a band cm-1 cm-1 at 1071 from nucleic acid phosphodiester groups and iv) a band at 1153 from polysaccharide molecules (Table 3).”
Detection of Human Cholangiocarcinoma Markers in Serum Using Infrared Spectroscopy DOI: 10.3390/cancers13205109 -
Acetate confidence 1.0
“1071 (C-O stretching) as indicator of plasticisers in the formulation because it can be found in all spectra.”
De Sa 等 - 2021 - Tracing Poly(Vinyl Acetate) Emulsions by Infrared DOI: 10.3390/polym13213609 -
Silicon-oxygen (Si-O) confidence 1.0
“The studied quartz was detected with bands at 460.90 cm-1, 491.73 cm-1, 773.68 cm-1, and 1071.43 cm-1.”
Fawzy - 2021 - Separation of fine beryl from quartz via magnetic DOI: 10.37190/ppmp/132329
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