What absorbs at 437 cm⁻¹ in an FTIR spectrum?
A band near 437 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 437 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 |
|---|---|---|---|
| Metal oxygen | 3 | 3 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| Triglyceride | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 0,9 |
| Methoxy (OCH3) | 1 | 0 | 1,0 |
| Methacrylate | 1 | 0 | 1,0 |
| C-O single bond | 1 | 0 | 1,0 |
| Acetate | 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 |
|---|---|---|---|
| ZnO | 437, 1400, 3430 | Metal oxygen | 3 |
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 437 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
-
încredere 1,0
“We have observed six absorption peaks at 437, 917, 2157, 2852, 2925 and cm-1 3749 which are related to Zn-O, Al-N, N-O, Alkaline group, C-H stretching vibration and Zn-Al vibrational modes respectively.”
Enhancement of Al-N co-dopant solubility in ZnO by high temperature thermal annealing DOI: 10.1016/j.ceramint.2018.10.005 -
încredere 1,0
“The 437cm-1 E characteristic peak, assigned to the non-polar 2 optical phonon mode, is present for the pure and Mn-doped ZnO thin films, with a similar shape.”
Kharroubi 等 - 2012 - Mn doping effect on the structural properties of Z DOI: 10.1088/0031-8949/86/01/015805 -
încredere 1,0
“The peak at around 437 is assigned to sized Mg(OH) prepared using EDA and TEA (Fig.”
Mageshwari 和 Sathyamoorthy - 2012 - Studies on Photocatalytic Performance of MgO Nanop DOI: 10.1007/s12666-011-0106-5 -
încredere 1,0
“The Raman bands at 583 and intensity of Raman band at 437 decreased with cm-1 are associated with structural disorders, such as oxygen doping concentration into ZnO that may be attributed to 660 Mn vacancy, the Zn interstitial, impurity ato”
Vinod 等 - 2015 - Quenching and blue shift of UV emission intensity DOI: 10.1016/j.mseb.2014.10.004 -
Silicon (Si) încredere 1,0
“437cm-1 phological change observed in the synthesized The band at is related to the Si-O-Si bending geopolymer is due to the dissolution of metakaolin aluvibration.”
El Alouani 等 - 2019 - Preparation, Characterization, and Application of DOI: 10.1155/2019/4212901 -
încredere 1,0
“Wefoundthe520cm-1,460cm-1,437cm-1 and417cm-1 cm-1 peakswithinthe300-600 range, due to the presence of C-X bonds (X = halogen: Cl, Br, I), as well as of plane defor-”
Determination of the Conservation State of Some Documents Written on Cellulosic Support in the Poni-Cerntescu Museum, Iași City in Romania DOI: 10.3390/app11188726 -
Fatty acid încredere 1,0
“3A shows the FTIR spectra between 4000 and 400 The oil spectrum is characterized 437 by several bands (peaks), mainly attributed to the presence of oleic and linoleic fatty acids, 438 triglycerides and peroxides.”
Kharbach 等 - 2021 - New insights into the Argan oil categories charact DOI: 10.1016/j.talanta.2020.122073 -
Metal oxygen încredere 1,0
“[65] assigned the band at 437 cm-1 in silicate structures to Mg-O stretch + O-Si-O”
Zviagina 等 - 2020 - Distinguishing Features and Identification Criteri DOI: 10.3390/min10020153
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