What absorbs at 1267 cm⁻¹ in an FTIR spectrum?
A band near 1267 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 1267 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 |
|---|---|---|---|
| Alkyl C-H | 7 | 7 | 1,0 |
| Methacrylate | 7 | 6 | 1,0 |
| Acetate | 7 | 6 | 1,0 |
| Methoxy (OCH3) | 6 | 5 | 1,0 |
| C-O single bond | 6 | 5 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Lignin | 2 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 0,9 |
| C=n | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
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 1267 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
-
Alkene (C=C) încredere 1,0
“[30] identified from FT-Raman spectra of olive pomace that the major bands of Figure 2 presents the spectra obtained when concentrations of FAME were evaluated by virgin olive oil were seen at 1267 cm-1 (=C-H), deformation in unconjugated c”
Monitoring Enzymatic Hydroesterification of Low-Cost Feedstocks by Fourier Transform InfraRed Spectroscopy DOI: 10.3390/catal9060535 -
Alkyl C-H încredere 1,0
“The vibration band at 1267 cm-1, 267 displayed by AgvCca 90 corresponds to vibrations of C-H and C-O bonds (Bureau et al., 2019;”
Vazquez-Vuelvas 等 - 2020 - A comparative FTIR study for supplemented agavin a DOI: 10.1016/j.foodhyd.2020.105642 -
Acetate încredere 1,0
“Strong stretching C-O vibrations are observed at 1267, 1032cm-1.”
HPTLC and FTIR Fingerprinting of Olive Leaves Extracts and ATR-FTIR Characterisation of Major Flavonoids and Polyphenolics DOI: 10.3390/molecules26226892 -
Alkyl C-H încredere 1,0
“due to the presence of CH symmetric stretching 3 cm-1 whereas the peaks at about 1267 and 749 may 3.1.2.”
Ahmed 等 - 2013 - Quantitative determination of tolfenamic acid and DOI: 10.2478/s11532-013-0284-6 -
Ester încredere 1,0
“cm-1 cm-1 the principal bands at 2854 to phenyl groups, the bands at 1267 and 2924 correscorresponds to cm-1 pond to the symmetric and anti-symmetric stretching in ester carbonyl groups, and the band at 1060 correthe CH sponds to primary OH”
Aisha 等 - 2014 - Preparation and characterization of nano liposomes DOI: 10.1155/2011/103039. -
Alkyl C-H încredere 1,0
“The bands at 1267 cm-1 and 749 cm-1 are attributed to C-H and C-N deformation, respectively [45].”
Regularities of Encapsulation of Tolfenamic Acid and Some Other Non-Steroidal Anti-Inflammatory Drugs in Metal-Organic Framework Based on -Cyclodextrin DOI: 10.3390/pharmaceutics15010071 -
Alkyl C-H încredere 1,0
“Indian Journal of Pharmaceutical Education and Research | Vol 54 | Issue 3 [Suppl] | Jul-Sep, 2020 Dubey and Dewangan.: Transdermal Patch of Irbesartan for Hypertension cm-1 delivery system of Irbesartan for enhancement of 1375 for C-H Asym”
Dubey 和 Dewangan - 2020 - Rational Design and Characterization of Transderma DOI: 10.5530/ijper.54.3s.145 -
Acetate încredere 1,0
“cm-1, spectrum at 950 and 855 band with the maximum at 1267 which was the result of coupling between the valence vibration of C-O 365 S.S.”
Ilic-Stojanovic 等 - 2015 - The improved photostability of naproxen in the inc DOI: 10.2298/HEMIND131128050I
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