What absorbs at 1056 cm⁻¹ in an FTIR spectrum?
A band near 1056 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 1056 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 | 12 | 11 | 1.0 |
| Methoxy (OCH3) | 11 | 10 | 1.0 |
| Methacrylate | 11 | 10 | 1.0 |
| Acetate | 11 | 10 | 1.0 |
| Alkyl C-H | 5 | 5 | 1.0 |
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Carbohydrate | 4 | 4 | 1.0 |
| Phosphate (PO4) | 3 | 2 | 1.0 |
| Amide | 3 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Secondary amine | 2 | 1 | 1.0 |
| C n single bond | 2 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 0.6 |
| Nucleic acid | 1 | 0 | 1.0 |
| S eq o | 1 | 0 | 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 |
|---|---|---|---|
| ZnO | 1056, 1400, 3430 | Acetate, Methacrylate, C-O single bond | 1 |
| Polyethylene | 1056, 1737, 1720 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| ZnO nanoparticles | 1056, 1219, 1726 | Methacrylate, Acetate, C-O single bond | 1 |
| cellulose | 1056, 1735, 1650 | Acetate, Methacrylate, 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 1056 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
-
Carboxyl (COOH) confidence 1.0
“finally and at 1% clearly another peak arises at 1056 What specific (2) All contributions to heat of mixing are due to acid-”
Specific interactions of low molecular weight analogues of carnauba wax and polyethylene glycol binders of ceramic injection moulding feedstocks DOI: 10.1016/j.ceramint.2014.11.082 -
Carbohydrate confidence 1.0
“[28]), the authors showed that peaks at cm-1 cm-1 cm-1 1056 (corresponding to carbohydrates), 1270 (amid III), and 1592 (amino acids) were significantly reduced in spectra obtained from plasma of healthy persons compared to patients with ch”
A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules -
Acetate confidence 1.0
“A peak at 1055.990 ZnO which may correspond to the alcoholic C-O stretching or size.”
Farhat 等 - 2018 - Synthesis and Characterization of Er-Doped Nano Zn DOI: 10.1007/s10948-017-4548-9 -
Ammonium confidence 1.0
“The intensive bands located at 1874, 1567 and 1056 cm-1 were corshows pure malachite, and Figure 4b displays (NH 4) 2S.”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
Acetate confidence 1.0
“A sharp and steep band cm-1 observed at 1056 region is due to the stretching of the C O C Dynamic mechanical analyser (DMA) 2.7.4.”
Laccase-assisted grafting of poly(3-hydroxybutyrate) onto the bacterial cellulose as backbone polymer: Development and characterisation DOI: 10.1016/j.carbpol.2014.07.003 -
Carbohydrate confidence 1.0
“Pitman, 2003), cellulose peaks appeared at about 1056 and light source was used to survey the composition of single and 1157cm(cid:2)1,”
Jiang 等 - 2009 - Germination and growth of sponge gourd (Luffa cyli DOI: 10.1016/j.scienta.2009.06.021 -
Phosphate (PO4) confidence 1.0
“cm-1 42vibration band at 1056 These different bands are assigned to HPO has been observed in wellions, one of cm-1 crystallized HA associated with a component at 1066 the most important source of disorder in the mineral lattice.”
Lebon 等 - 2008 - Characterization of archaeological burnt bones co DOI: 10.1007/s00216-008-2469-y -
Acetate confidence 1.0
“by the C-O stretching peaks at 1056 and 1033 and the CH bending at 900 A summary of the characteristic band assignments is provided in Table 1.”
Effects of Wet and Dry Treatments on Surface Functional Groups and Mechanical Properties of Flax Fiber Composites DOI: 10.3390/coatings13061036
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