What absorbs at 733 cm⁻¹ in an FTIR spectrum?
A band near 733 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 4 cited sources
Quick answer
A band near 733 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Ketone | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Possible materials
| Material | Unterstützende Peaks | Overlapping groups | Zitierte Quellen |
|---|---|---|---|
| hemicelluloses | 733, 1735, 1270 | Methacrylate | 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 733 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.
Literatur hinter diesen Zuweisungen
-
Vertrauen 1,0
“An FTIR investigation shows that the SnO 2-doped GO nanocomposite exhibits two distinct bands at 733 and cm-1 cm-1 438 due to terminal oxygen vibrations, while samples treated with G-O-Sn-O exhibit bands at 733 due to antisymmetric stretchi”
Reactive Oxygen Species (ROS) Are Generated as Organic Contaminants Are Broken Down: SnO DOI: 10.1007/s12668-023-01111-3 -
C c single bond Vertrauen 1,0
“deformation of (C-C) bond is observed at 733 Besides, the absorption bonds cm-1 located at 1485 and 1436 in IR spectrum are assigned to the (C-N-H) sym-”
Growth, crystal structure, Hirshfeld surface and vibrational properties of a new supramolecular hybrid material: (C4H7N2)2TeBr6 DOI: 10.1007/s00289-021-04053-6 -
Carbonyl (C=O) Vertrauen 1,0
“the disappearance of ester linkage absorption (1,733 cm-1 band is also a carbonyl stretching band due to para-substituted ketones The 1,653 or aryl aldehydes, which has the same absorbance among the seven FTIR spectra.”
Ruzene 等 - 2008 - An alternative application to the Portuguese agro- DOI: 10.1007/s12010-007-8066-2 -
Acetate Vertrauen 1,0
“The analysis was performed in order to observe the presence of FTIR bands that could reflects the potential of hydrolysis, such as the bands in approximately 3300 (O-H stretching vibrations), 733 (C=O stretching originating from esters or a”
de Souza 等 - 2019 - Screening of fungal strains with potentiality to h DOI: 10.4025/actascitechnol.v41i1.39693
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