What absorbs at 1044 cm⁻¹ in an FTIR spectrum?
A band near 1044 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 1044 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 | 16 | 16 | 1.0 |
| Acetate | 14 | 14 | 1.0 |
| Methoxy (OCH3) | 13 | 13 | 1.0 |
| Methacrylate | 13 | 13 | 1.0 |
| Carbohydrate | 5 | 5 | 1.0 |
| Phosphate (PO4) | 4 | 3 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Nucleic acid | 2 | 2 | 1.0 |
| S eq o | 2 | 2 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Fatty acid | 1 | 1 | 1.0 |
| Thiocarbonyl | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Urethane | 1 | 1 | 0.9 |
| Aldehyde (CHO) | 1 | 1 | 0.9 |
| Alkyl C-H | 1 | 1 | 0.7 |
| Phospholipid | 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 |
|---|---|---|---|
| cellulose | 1044, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| lignin | 1044, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| kraft lignin | 1044, 1744, 1710 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| chitosan | 1044, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| glycerol | 1044, 1585, 1630 | 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 1044 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
-
Acetate confidence 1.0
“Another cm-1 obvious sharp peak credited to the C-O stretching is observed at 1044, 1043, and 1039”
Structural, Electrical and Electrochemical Properties of Glycerolized Biopolymers Based on Chitosan (CS): Methylcellulose (MC) for Energy Storage Application DOI: 10.3390/polym13081183 -
Acetate confidence 1.0
“However, as the number of lithium ions increased, the interactions between the lithium ions and the oxygen atoms (C=O) in the acetate ions or the carboxylate ions became more cm-1 dominant, and therefore the intensity of the peak at 1044 de”
Mobarak 等 - 2015 - Carboxymethyl Carrageenan Based Biopolymer Electro DOI: 10.1016/j.electacta.2015.02.200 -
confidence 1.0
“x cm-1, cm-1, He/O 1044 Si-O-Si network stretch at 1107 and Si-O-Si the treated sample compared to the O ashed film can be 2 2 cm-1.”
Vinogradova 等 - 2008 - Application of deuterium exchange to analyze moist DOI: 10.1149/1.2947786(cid:2) -
Carbohydrate confidence 1.0
“expressive increase in the intensity of the peaks near 1044 and 1075 Lipids cm(cid:5)1, related to soluble sugars in general, structural carbohydrates and Nucleicacids components with phosphorus in its composition.”
Modelling the vigour of maize seeds submitted to artificial accelerated ageing based on ATR-FTIR data and chemometric tools (PCA, HCA and PLS-DA) DOI: 10.1016/j.heliyon.2020.e03477 -
Acetate confidence 1.0
“The highest peaks at 1086 and cm-1 1044 are ascribed to the C-O stretch absorption bands, which are important regions for ethanol 1044 cm-1 are ascribed to the C-O stretch absorption bands, which are important regions for ethanol and methan”
Application of Functional Data Analysis and FTIR-ATR Spectroscopy to Discriminate Wine Spirits Ageing Technologies DOI: 10.3390/math8060896 -
N-O bond confidence 1.0
“~1456 ~1403 and 1236 Howcm-1/1038 cm-1 ever, the spectral absorption bands of malignant and benign samples in ~1044 cm-1/876 cm-1 and ~884 regions showed no significant differences.”
ATR-FTIR spectroscopy as adjunct method to the microscopic examination of hematoxylin and eosin-stained tissues in diagnosing lung cancer DOI: 10.1371/journal.pone.0233626 -
Acetate confidence 1.0
“Among 401 cm-1 them, the absorption at 1044 was mainly attributed to C-O stretching on C-O-C 402”
Beltramino 等 - 2016 - Optimization of sulfuric acid hydrolysis condition DOI: 10.1007/s10570-016-0897-y -
S eq o confidence 1.0
“The S=O stretching vibration of DMSO appears at 1044 cm-1 at 1044 and will therefore not overlap with any C=O vibrations of interest in the and will therefore not overlap with any C=O vibrations of interest in the analytes.”
The Effect of Sample Preparation Techniques on Lignin Fourier Transform Infrared Spectroscopy DOI: 10.3390/polym15132901
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