What absorbs at 1753 cm⁻¹ in an FTIR spectrum?
A band near 1753 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 1753 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 |
|---|---|---|---|
| Carbonyl (C=O) | 5 | 4 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Methacrylate | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Acetate | 2 | 2 | 1.0 |
| Secondary amine | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| PMMA | 1753, 1722, 1383 | Methacrylate, Carbonyl (C=O), Carboxyl (COOH) | 1 |
| PEG | 1753, 1650, 1342 | Methacrylate, Carbonyl (C=O) | 1 |
| PLA | 1753, 1650, 1073 | Methacrylate, Carbonyl (C=O), Carboxyl (COOH) | 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 1753 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
-
confidence 1.0
“cm-1 cm-1, cocrystal compared with the corresponding peaks of 5-FU at 3220.24 and 1662 There was a shift of the amino and carbonyl peaks to 3311 cm-1 and 1753 cm-1 in this cm-1.”
Synthesis, Characterization, Theoretical and Experimental Anticancer Evaluation of Novel Cocrystals of 5-Fluorouracil and Schiff Bases against SW480 Colorectal Carcinoma DOI: 10.3390/pharmaceutics15071929 -
N h confidence 1.0
“The first is a symmetrical peak/ cm-1 cm-1 (1753/1742 if the dark minus from polypeptide CN stretching and NH bending modes, trough at 1752/1740 CdC dark spectrum is subtracted) that is similar to the feature aromatic amino acids, and heme”
Rich 和 Breton - 2001 - FTIR studies of the CO and cyanide adducts of full DOI: 10.1021/bi0027332 -
Hydrogen bond confidence 1.0
“This indicates that the M formation ac7b) In the case of we observed a positive R-helix cm-1 cm-1 companies a weakened hydrogen bond of the in band at 1753 in H 2O, which shifts to 1742 in”
Suzuki 等 - 2008 - Structural Changes of Salinibacter Sensory Rhodops DOI: 10.1021/bi801358b -
confidence 1.0
“The other peaks are observed at 1753, 1550, 1150, cm-1 cm-1 1389, 1050, 750, 650, and 500 due to Al-I linkage.”
The Effect of AlI3 Nanoadditive on the Thermal Behavior of PMMA Subjected to Thermoanalytical Py-GC-MS Technique DOI: 10.3390/ma14227036 -
Acetate confidence 1.0
“the formic acid that appears cm-1 at 1753 exhibits very weak C=O stretching vibrations [30,41].”
The Activity of Ultrafine Cu Clusters Encapsulated in Nano-Zeolite for Selective Hydrogenation of CO2 to Methanol DOI: 10.3390/catal12111296 -
Amide confidence 1.0
“and 1164 displaying C-N stretching The FTIR ester groups at the wave numbers of 1753 cm-1, respectively.”
Gunawan 等 - 2018 - Optimization of Alkyldiethanolamides Synthesis fro DOI: 10.5650/jos.ess18042 -
Carboxyl (COOH) confidence 1.0
“P 20L 5DA macromonomer also show the same diad absorptions at similar wavenumbers, but the P 20L 2.5DA macromonomer contains only short lactate cm-1, sequences, and reveals just one lactate absorption peak centred at 1753 in cm-1.”
Wang 等 - 2013 - FT-IR Characterization and Hydrolysis of PLA-PEG-P DOI: 10.1002/pola.26930 -
Acetate confidence 1.0
“FTIR Spectroscopy For A LPEI, the most significant changes appearing with metal sorption are identified in the regions (Figure 8, Tables S7 and S8): cm-1-the ~1753 C=O stretching band disappears after La (III) and Tb (III) sorption;”
Synthesis of a New Phosphonate-Based Sorbent and Characterization of Its Interactions with Lanthanum (III) and Terbium (III) DOI: 10.3390/polym13091513
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