What absorbs at 2341 cm⁻¹ in an FTIR spectrum?
A band near 2341 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
Răspuns rapid
A band near 2341 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Thiol | 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 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 0 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Materiale posibile
| Material | Vârfuri suport | Grupuri suprapuse | Surse citate |
|---|---|---|---|
| hematite | 2341, 1030, 469 | Hydroxyl (O-H), C-O single bond | 1 |
Materialele sunt afișate numai atunci când același grup de literatură susține această bandă și cel puțin un vârf caracteristic suplimentar.
Logica spectrului
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 2341 cm⁻¹ is usually not enough for material identification by itself.
Utilizare în condiții reale
Acest tip de interogare este comun în identificarea polimerilor, screeningul materialelor plastice necunoscute, depanarea QC, verificarea materialelor reciclate și revizuirea atribuirii vârfurilor bazată pe literatură.
Greșeli comune
- Tratarea unei benzi izolate ca dovadă a unui material fără a verifica cel puțin unul sau două vârfuri de susținere.
- Ignorând suprapunerea: mai multe grupuri funcționale pot contribui în apropierea aceluiași număr de undă.
- Omiterea validării atunci când aditivii, amestecurile, oxidarea sau contaminarea pot distorsiona spectrul.
Sfat de verificare
Când ambiguitatea rămâne, validați ipoteza prin DSC, GC-MS sau TGA, în special pentru amestecuri, probe degradate și polimeri umpluți.
Literatura din spatele acestor atribuiri
-
Hydroxyl (O-H) încredere 1,0
“cm-1 The peak at 2341 attributed to the coupling effect of stretching and bending vibrations of -OH [45].”
Influence of pH on the structural, spectral, optical, morphological and photocatalytic properties of ZrO2 nanoparticles synthesized by sol–gel technique DOI: 10.1007/s10854-020-04134-8 -
Hydroxyl (O-H) încredere 1,0
“The adsorption band appeared at cm-1was 2341 ascribed to O-H vibration and CO”
Influence of Ho3+ substitution on structural and magnetic properties of Mg–Mn ferrites DOI: 10.1007/s10854-021-05547-9 -
Acetate încredere 1,0
“Analysis of the FTIR spectra revealed that with mechanical acticm-1 vation process, the peak corresponding to the C-O bandat 2341 vanishes and intensity of carboxyl group cm-1)and nitrateionsband(1396cm-1) (1445 areaffected.The presenceofth”
Low-temperature synthesis of Sr2FeMoO6 double perovskite; structure, morphology, and magnetic properties DOI: 10.1016/j.ceramint.2020.03.264 -
Acetate încredere 1,0
“Tentatively Assigned Band Wavelength (cm-1) Tentatively Assigned Band 3450 O-H stretching 3450 O-H stretching 2341 -C=O stretching of the aliphatic compound 2341 -C=O stretching of the aliphatic compound 1650”
Microstructural Characterization of Fibric Peat Stabilized with Portland Cement and Silica Fume DOI: 10.3390/ma16010018 -
Thiol încredere 1,0
“The peak at 2341 is assigned to S-H vibration in the thiol group with minimum intensity group and may be attributed to the deprotonation of the thiol group in the cysteine molecule cm-1, that is the pre-requisite for the formation of Au-Ag-”
Cysteine-silver-gold Nanocomposite as potential stable green corrosion inhibitor for mild steel under acidic condition DOI: 10.1038/s41598-019-57181-5 -
Alkyl C-H încredere 1,0
“The main bands are at 2925.48 and corresponding to the asymmetric and symmetric stretch C-H aliphatic 2341.16cm(cid:3)1 m CH, 2360.44 and corresponding to the asymmetric 1620.5cm(cid:3)1 m and symmetric stretch of atmospheric CO CO2, cor2 C”
Blasco-Lopez 等 - 2015 - Methodology for characterising microlayers in hist DOI: 10.1016/j.conbuildmat.2015.05.135 -
Carboxyl (COOH) încredere 1,0
“While the band at 3450 cm-1 cm-1 is attributed to the presence of carboxylate anion and another peak at 2341 is that of CH 2 cm-1 rocking and OH bending modes or the C-OH group of frees polysaccharides.”
Farghaly 等 - 2021 - Physicochemical study and application for pyrolusi DOI: 10.37190/ppmp/131944 -
Phosphate (PO4) încredere 1,0
“The peaks at 2341 and 2358 43H+ of the reaction of PO with the that came from the COOH corresponded to the stretching vibration of the P-OH in the cm-1 group.”
Ran 等 - 2014 - Molecular Mechanism of Nano-Hydroxyapatite Surface DOI: 10.14233/ajchem.2014.18110
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