What absorbs at 741 cm⁻¹ in an FTIR spectrum?
A band near 741 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 741 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 0 | 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 |
|---|---|---|---|
| soil | 741, 575, 1240 | Hydroxyl (O-H), Alkyl C-H | 1 |
| nanoparticles | 741, 1732, 1647 | Alkyl C-H, Hydroxyl (O-H) | 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 741 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
-
Alkyl C-H Vertrauen 1,0
“cm-1 (carboxylic acid), 1599 (aromatic C C bending and stretchcm-1 cm-1 ing), 1459 (C H bend), 1382 ( OH bending and C O cm-1 stretching of carboxylic acid), 741 and 756 (1,2-disubstituted ring vibrations), respectively.”
Telmisartan complex augments solubility, dissolution and drug delivery in prostate cancer cells DOI: 10.1016/j.carbpol.2013.09.077 -
Alkyl C-H Vertrauen 1,0
“Peaks at (741,697 cm-1) and (598 cm-1) corresponds to CH bending and C-OH bending respectively.”
Kumar 等 - 2021 - Centella asiatica mediated facile green synthesis DOI: 10.1016/j.inoche.2021.108865 -
Vertrauen 1,0
“cm(cid:2)1 cm(cid:2)1 peaks of OH, 957 and 1035 are the inside and minerals dispersed in alkaline pH due to the strong electrocm(cid:2)1 outside bending and vibrating peaks of OH, 741 is static repulsion among mineral particles caused by th”
Yu-hua 等 - 2008 - Beneficiation of diasporic-bauxite ore by selectiv DOI: 10.1016/j.mineng.2008.01.001 -
N h Vertrauen 1,0
“Assigned Vibrations 741 702 NH bending and CH bending from aminophenyl radicals 2 801 749”
Spectroscopic Investigations of Porphyrin-TiO2 Nanoparticles Complexes DOI: 10.3390/molecules28010318 -
Ring structure Vertrauen 1,0
“832.22 - 833 Ring vibration 741.45 785.25”
Rahmawati 等 - 2022 - Effect of Sterilization on the Degree of Esterific DOI: 10.17576/jsm-2022-5111-13 -
Alkyl C-H Vertrauen 1,0
“group are seen at 1504 and 1392 and the characteristic C-H vibration of the benzene ring at 741 In the cm-1 inset A of Fig.”
Iron-Terephthalate Coordination Network Thin Films Through In-Situ Atomic/Molecular Layer Deposition DOI: 10.1038/s41598-018-27124-7 -
Vertrauen 0,9
“Explicit assignment.”
Nadeem 等 - 2022 - Stability Analysis of Fe3O4-OA-MWCNT Nanocomposite DOI: 10.1155/2022/1859698 -
Vertrauen 0,9
“Distinct vibration band at 741 cm-1 identifies dolomite.”
Shafiquzzaman 等 - 2022 - Sawdust Recycling in the Development of Permeable DOI: 10.3390/su141811115
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