What absorbs at 1151 cm⁻¹ in an FTIR spectrum?
A band near 1151 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 1151 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 |
|---|---|---|---|
| Methacrylate | 13 | 13 | 1,0 |
| Acetate | 13 | 13 | 1,0 |
| C-O single bond | 13 | 13 | 1,0 |
| Methoxy (OCH3) | 12 | 12 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Chitosan | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Triglyceride | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 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 |
|---|---|---|---|
| cellulose | 1151, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| hemicellulose | 1151, 1730, 897 | Methacrylate, Acetate, C-O single bond | 1 |
| GO | 1151, 1720, 1182 | Methacrylate, Acetate, C-O single bond | 1 |
| rGO | 1151, 2358, 2930 | Methacrylate, Acetate, C-O single bond | 1 |
| PCL | 1151, 1751, 1724 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| cotton | 1151, 1030, 1638 | Methacrylate, Acetate, 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 1151 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
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Acetate încredere 1,0
“[8] also 2 cm-1 found a sharp peak at 1151 due to the stretching-shaking of C=O ester groups of cm-1 triglycerides and of 1163 for walnut oils during roasting.”
Characterizing the Bioactive Ingredients in Sesame Oil Affected by Multiple Roasting Methods DOI: 10.3390/foods11152261 -
Acetate încredere 1,0
“In the synchronous C-O spectra of both film types, the strongest autopeak corresponded to the stretching mode, appearing at1151and1168cm-1fortheLBandspin-coatedfilms,respectively.Thissuggeststhattheconformation of the tert-butoxy group chan”
Shin 等 - 2002 - Structural comparison of Langmuir-Blodgett and spi DOI: 10.1021/la020135d -
Acetate încredere 1,0
“The FTIR band characteristics are as follows: is N-H of amines and C = C stretching of cm-1 alkene, and 1151 is C-O stretching and C-N stretching of amine [32-37].”
Multivariate analysis for FTIR in understanding treatment of used cooking oil using activated carbon prepared from olive stone DOI: 10.1371/journal. -
Ester încredere 1,0
“4a, the intensity and frequency of the ester stretching 1151cm(cid:2)1 liver cells.”
Biophysical evaluation of physiological effects of gilthead sea bream (Sparus aurata) farming using FTIR spectroscopy DOI: 10.1016/j.foodchem.2013.08.111 -
încredere 1,0
“SEM images (Figure 3(a)) of metakaolin showed that the brations of O-C-O due to atmospheric carbonation on the 1151cm-1 sample is a heterogeneous material consisting of irregusurface of kaolin.”
El Alouani 等 - 2019 - Preparation, Characterization, and Application of DOI: 10.1155/2019/4212901 -
Carbohydrate încredere 1,0
“At wavenumber 1151 and 1177 a peak is formed β-CD due to stretching within the COCs present in cellulose and [8,12].”
Grgac 等 - 2022 - The Effect of Ultrasonic Treatment on the Binding DOI: 10.3390/ma15020470 -
Chitosan încredere 1,0
“Chitosan peaks were observed at 897 and 1151 cm-1 cm-1”
Hedayatyanfard 等 - 2019 - Semi-IPN Films and Electrospun Nanofibers Based on DOI: 10.22037/ijpr.2019.1100712 -
Alkyl C-H încredere 1,0
“Bands 1151 and 1057 can be assigned cm-1 O stretch vibrations in resorcinol, and the band at 964 cm-1 probably belongs to the C-H to C-O stretch vibrations in resorcinol, and the band at 964 probably belongs to deformation vibration in the”
Kinetics of Resorcinol-Formaldehyde Condensation—Comparison of Common Experimental Techniques DOI: 10.3390/gels8010008
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