What absorbs at 753 cm⁻¹ in an FTIR spectrum?
A band near 753 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 753 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.
可能性のある官能基アサイン
| 官能基 | 裏付け事実 | 引用元 | 最高信頼度 |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Methoxy (OCH3) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Chlorine | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Carbon bromine | 1 | 1 | 1.0 |
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Possible materials
| 素材 | 補助ピーク | Overlapping groups | 引用元 |
|---|---|---|---|
| PVP | 753, 2983, 1648 | Alkyl C-H, Methacrylate, Acetate | 1 |
| chitosan | 753, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 1 |
| HCl | 753, 1708, 1032 | Aromatic ring, Methacrylate, Acetate | 1 |
| montmorillonite | 753, 1637, 523 | Methacrylate, Acetate | 1 |
| nanocomposites | 753, 1717, 1630 | Alkyl C-H, Methacrylate, Acetate | 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 753 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.
これらのアサインの根拠となる文献
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信頼度 1.0
“Finally, the band at cm-1 cm-1 cm-1 818 correlates with Si-O stretching, at 753 to Al-O-Si, at 699 to Si-O, and cm-1 at 616 to the coupled Al-O and Si-O [35].”
Caliman 等 - 2023 - Gellan Gum-Montmorillonite Nanocomposites for Elec DOI: 10.3390/coatings13020350 -
Acetate 信頼度 1.0
“cm-1 band observed at 1067.69 cm-1 corresponded to C-O stretching of alcohols, whereas the The absorption bands observed at 752.97 and 574.11 were assigned to C-Cl and C-Br stretching of alkyl halides, respectively.”
Facile Green Synthesis of Zinc Oxide Nanoparticles with Potential Synergistic Activity with Common Antifungal Agents against Multidrug-Resistant Candidal Strains DOI: 10.3390/cryst12060774 -
信頼度 1.0
“The band corresponds to asymmetric 1562 semiquinonoid structures [2, 11] 2927cm-1, C-H stretching vibration appear at and the band υ stretching vibrations in quinonoid unit 753cm-1 C�N at is assigned to the vibration of N-H.”
Benahmed 等 - 2018 - Spectroscopic Study of PolyanilineAgCl@Ag Nanocom DOI: 10.1155/2018/7320654 -
Carboxyl (COOH) 信頼度 1.0
“3 862 VW C-COO stretch - - 753 VW C=O bend - -”
Califano 等 - 2008 - Matrix-assisted pulsed laser evaporation of poly ( DOI: 10.1117/1.2830660(cid:4) -
Aromatic ring 信頼度 1.0
“The 753 band is assigned to the Ar-H out-of-plane vibration.”
Developing Further Versatility in Benzoxazine Synthesis via Hydrolytic Ring-Opening DOI: 10.3390/polym12030694 -
C c single bond 信頼度 1.0
“While XPS proved beneficial assignment: ring C-C vibration at 753 cm-1, C-C vibrations at 850 cm-1, C-C ring breathing in analysing the surface composition of each fibrous scaffold, it was difficult to pinpoint at 934 cm-1, C-Cbackbone at 1”
Electrospun Fibres of Chitosan/PVP for the Effective Chemotherapeutic Drug Delivery of 5-Fluorouracil DOI: 10.3390/chemosensors9040070 -
信頼度 1.0
“ence of moisture, and at 1120 cm-1 longitudinal Si-O stretching, between 1000 cm-1 and 1030 cm-1 Si-O stretching due to the presence of quartz, O-H folding at 911 cm-1 from internal hydroxyl, Si-O folding at 753 cm-1, perpendicular stretchi”
Development of an Epoxy Matrix Hybrid Composite with Astrocaryum Aculeatum (Tucumã) Endocarp and Kaolin from the Amazonas State in Brazil DOI: 10.3390/polym15112532 -
Alkyl C-H 信頼度 1.0
“In the spectrum of ZnMOF-BTA, metallic-oxygen bands are observed at 435 cm-1 and 463 cm-1 and are assigned to stretching vibrations of Zn-O bonds in the MOF [32], and bands observed at 745 cm-1 and 753 cm-1 correspond to the characteristic”
Synthesis, Characterization and Investigation of Anticorrosion Properties of an Innovative Metal–Organic Framework, ZnMOF-BTA, on Carbon Steel in HCl Solution DOI: 10.3390/coatings12091288
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