What absorbs at 1253 cm⁻¹ in an FTIR spectrum?
A band near 1253 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 1253 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 | 8 | 8 | 1,0 |
| Acetate | 8 | 8 | 1,0 |
| C-O single bond | 7 | 7 | 1,0 |
| Methoxy (OCH3) | 7 | 7 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Alkyl C-H | 3 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| N 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 1253 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
-
Acetate încredere 1,0
“The band 1253cm-1 is assigned for the C-O stretching between at”
Das 等 - 2004 - Kinetics and adsorption behaviour of salicylate on DOI: 10.1016/j.colsurfa.2004.02.010 -
Acetate încredere 1,0
“cm-1 agave is carried out in masonry ovens at a temperature The peak at 1253 was related to C-O and Ccm-1 of 95 °C for a period time between 28 and 48 h.”
Mondragon-Cortez 等 - 2022 - Application of Fourier transform infrared spectros DOI: 10.24275/rmiq/Alim2806 -
Carboxyl (COOH) încredere 1,0
“The peak observed at 1253 cm-1 can be assigned to the -COO (ester) group [61].”
Cheng 等 - 2019 - Extraction of Humic Acid from Lignite by KOH-Hydro DOI: 10.3390/app9071356 -
Acetate încredere 1,0
“A saturated absorption bands at 1253 (SO symmetry stretching) for AS cm(cid:1)1 (C-O-C”
A KBr-impregnated paper substrate as a sample probe for the enhanced ATR-FTIR signal strength of anionic and non-ionic surfactants in an aqueous medium DOI: 10.1039/d0ra07286a -
Acetate încredere 1,0
“cm-1 (O-H stretching vibration), 2915 cm-1 (-CH2), absorption peaks for CA were observed at 3285 cm-1 peaks for CA were observed at 3285 (O-H stretching vibration), 2915 (-CH 2), 1584 cm-1 cm-1 1584 cm-1 (C=O stretching vibration) [36], 125”
Liu 等 - 2018 - Highly Efficient Flame Retardant Hybrid Composites DOI: 10.3390/polym10060625 -
Carboxyl (COOH) încredere 1,0
“associated with the weak band at 1734 cm-1 due to aldehyde C = O stretching), 1321 cm-1, cm-1 cm-1, associated with the weak band at 1734 due to aldehyde C = O stretching), 1321 1253 cm-1 due to stretching of O-C of carboxylic acids and der”
Popa 等 - 2022 - Influence of Convective and Vacuum-Type Drying on DOI: 10.3390/molecules27134063 -
Thiocarbonyl încredere 1,0
“The absorption peaks are observed in the pure ligand at 1253 cm-1 and 802 cm-1 which can be related to the ν(C=S).”
Rogalewicz 等 - 2022 - Antitumor Activity and Physicochemical Properties DOI: 10.3390/molecules27092703 -
Fluorine (C-F) încredere 1,0
“A shoulder appearing at approximately 1265 cm-1 is due to the asymmetric vibration of the CF2 peak which was reported to be at 1253 cm-1[26].”
Fabrication of PECVD-grown fluorinated hydrocarbon nanoparticles and circular nanoring arrays using nanosphere lithography DOI: 10.1016/j.apsusc.2007.11.053
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