What absorbs at 1074 cm⁻¹ in an FTIR spectrum?
A band near 1074 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 1074 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 |
|---|---|---|---|
| Methacrylate | 14 | 13 | 1.0 |
| Acetate | 14 | 13 | 1.0 |
| Methoxy (OCH3) | 13 | 12 | 1.0 |
| C-O single bond | 13 | 12 | 1.0 |
| Amide | 5 | 5 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Nucleic acid | 2 | 2 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Anhydride | 1 | 1 | 1.0 |
| Perchlorate | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 0.8 |
| Protein | 1 | 1 | 0.8 |
| Phospholipid | 1 | 1 | 0.8 |
| Silanol (Si-OH) | 1 | 0 | 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 |
|---|---|---|---|
| alginate | 1074, 1100, 1715 | Methacrylate, Acetate, Methoxy (OCH3) | 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 1074 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
“of peak changes in wavenumber for alginate-GA in BBPEs system (cm-1) Assignments (functional group) Wavenumber GA ALGAALGAALGAALGAALGAALGAALGA0 1 2 3 4 5 6 - C-O-C 1025 1030 1031 1035 1035 1080 1081 stretching - - - - - - - 1074 C-O stretch”
Enhancing proton conductivity of sodium alginate doped with glycolic acid in bio-based polymer electrolytes system DOI: 10.1007/s10965-020-02142-0 -
Alkyl C-H confidence 1.0
“The first peak is heating.5 a-helices b-sheets to the formation of and during assigned to the asymmetric stretching vibration of the aliphatic cm21 (m asC-O-C) and the second peak is attributed to The peak around 1074.2 associated with the”
Changes in hydrogen bonding in protein plasticized with triethylene glycol DOI: 10.1002/app.42166 -
Amide confidence 1.0
“cm(cid:1)1 C¼O ((cid:1)(cid:1)C(cid:1)(cid:1)O [C(cid:1)(cid:1)O(cid:1)(cid:1)C acidic group), 1224 stretching, ether group), and 1074 [tertiary amide stretching];”
Thermoanalytical and Fourier transform infrared spectral curve-fitting techniques used to investigate the amorphous indomethacin formation and its physical stability in Indomethacin-Soluplus® solid dispersions DOI: 10.1016/j.ijpharm.2015.10.042 -
Acetate confidence 1.0
“On the other hand, the Concentration Dependence of the IR Spectra of <70 (cid:238)(C-O) cm-1 at wt %, band located around 1074”
Maeda - 2001 - IR spectroscopic study on the hydration and the ph DOI: 10.1021/la001346q -
Chitosan confidence 1.0
“The bands at 1074 and 1032 wavenumbers [17] are due to antisymmetry FTIR Studies of Chitosan Electrolyte 119=[485] 2014 October 27 06:42 4000cm(cid:1)1 at FIGURE 1 Pure chitosan acetate in the 700 to spectral region.”
Majid 和 Arof - 2008 - FTIR studies of chitosan-orthophosphoric acid-ammo DOI: 10.1080/15421400801904286 -
confidence 1.0
“and C-H torsion in alkyl chain 995 N-C-N bending in first ring and C-C bending in the second ring C-N-C bending in imidazole ring and C-O stretching and C-Cl 1074 stretching”
Degradation of Losartan Potassium Highlighted by Correlated Studies of Photoluminescence, Infrared Absorption Spectroscopy and Dielectric Spectroscopy DOI: 10.3390/pharmaceutics14112419 -
confidence 1.0
“Al-O stretching vibrations of bonds in the aluminate type of host lattice by exhibiting sharp peaks at 1154 and 1074cm-1.”
An energy-efficient novel emerald Er3+ doped SrGdAlO4 nanophosphor for PC WLEDs excitable by NUV light DOI: 10.1016/j.ceramint.2019.08.118 -
Acetate confidence 1.0
“cm-1), cm-1), cm-1), (1450.65 C-N stretching (1394.53 amide III or C-N stretching (1235.67 CO-O-C cm-1), cm-1) symmetric stretching vibration (1073.59 stretching vibration of C-O groups ( 928.78 and”
Encapsulation of olive leaf phenolics within electrosprayed whey protein nanoparticles; production and characterization DOI: 10.1016/j.foodhyd.2019.105572
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