What absorbs at 1332 cm⁻¹ in an FTIR spectrum?
A band near 1332 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 1332 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 |
|---|---|---|---|
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 0,9 |
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 |
|---|---|---|---|
| diamond | 1332, 1378, 1545 | Methoxy (OCH3) | 2 |
| PVA | 1332, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| ZnO | 1332, 1400, 3430 | Acetate, Methacrylate, C-O single bond | 1 |
| PVC | 1332, 834, 1195 | Methoxy (OCH3), Methacrylate, Acetate | 1 |
| ZnO nanoparticles | 1332, 1219, 1726 | Methacrylate, Acetate, C-O single bond | 1 |
| graphite | 1332, 1640, 1326 | Methacrylate, Acetate, Methoxy (OCH3) | 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 1332 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
-
C c single bond încredere 1,0
“Isoindole stretching 1372 Isoindole stretching C-C 1332 Pyrrole stretching coupled with aza rocking C-H 1256 deformation C-H 1164 deformation”
Gharagozlou 和 Naghibi - 2018 - Sensitization of ZnO nanoparticles by metal-free p DOI: 10.1016/j.jlumin.2017.12.020 -
Acetate încredere 1,0
“There is no sharp cm-1 (structural OH and adsorbed water), a small peak at 1100 (sp 3and isolated characteristic Raman peak at 1332 cm-1 cm-1 due to C-O, and a large peak at around 815 bonded carbon) which is related to a nanodiamond phase”
Ito 等 - 2021 - Assessing the debris generated by the small carry- DOI: 10.2343/geochemj.2.0632 -
încredere 1,0
“cm-1 100 h 5 the Raman peak at 1332 associated with Fano interference 200 h 6.5 [27-29] in the boron doped diamond films was observed only in 400 h”
Jagannadham 等 - 2007 - Neutron transmutation of B-10 doped diamond DOI: 10.1016/j.diamond.2006.03.019 -
Boron nitrogen încredere 1,0
“of 745 and when the h-BN addition h-BN additive located at Furthercontent reaches 0.8wt% is interesting, which results more, the Raman peaks shift down to 1331.74 and”
B–C Bond in Diamond Single Crystal Synthesized with h-BN Additive at High Pressure and High Temperature DOI: 10.1088/0256-307X/33/2/028101 -
Alkyl C-H încredere 1,0
“The C-H stretching band on neighboring CHCl groups at and 1332 cm-1 were ascribed to hydrothermal process [27].”
Understanding Hydrothermal Dechlorination of PVC by Focusing on the Operating Conditions and Hydrochar Characteristics DOI: 10.3390/app7030256 -
Amide încredere 1,0
“cm-1 peak increases obviously after HPHT and the 1282 cm-1 peak,23 and the results are absorption coefficient of 1332 treatment, these two peaks are respectively attributed to C N+ listed in Table.”
Miao 等 - 2019 - High-pressure and high-temperature treatment of N- DOI: 10.1039/C9CE00472F. -
Amide încredere 1,0
“In order to check if the frequency of Characteristic vibration frequencies observed in our films cm(cid:2)1 and reduces due C-N stretching mode lies around 1332”
Titus 等 - 2006 - Nitrogen and hydrogen related infrared absorption DOI: 10.1016/j.tsf.2005.12.062 -
Alkyl C-H încredere 1,0
“The effect apportioned between cm-1 cm-1 at of 921 assigned to CH2 rocking and the peak at 1332 MWCNTs on some characterizing IR bands can be taken correspond to (CH+OH) bending [13].”
Characterization and some physical studies of PVA/PVP filled with MWCNTs DOI: 10.1016/j.jmrt.2018.04.023
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