What absorbs at 735 cm⁻¹ in an FTIR spectrum?
A band near 735 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 6 cited sources
Brzi odgovor
A band near 735 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.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Logika spektra
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 735 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Alkene (C=C) pouzdanost 1,0
“acteristic of hydroperoxides progressively shifted to higher wavecm(cid:3)1 cm(cid:3)1), oxidativeproductssuchashydroperoxides,aldehydes,ketonesand number (from about 3443 to 3519 indicating increase cm(cid:3)1 carboxylic acids, and peak in”
Ogbu 和 Ajiwe - 2016 - FTIR studies of thermal stability of the oils and DOI: 10.1016/j.renene.2016.04.055 -
Metal oxygen pouzdanost 1,0
“The linear model can be expressed by: 2 rel.abs.735=(0.0494±0.0089)+ w/o.U 3O (0.0089±0.0002) × (1) 8 cm-1 cm-1 735 735 cm-1 cm-1 735 band 735 band band intensity band intensity U 3O w/o Replica U 3O w/o Replica 8 8 intensity relative to in”
Silva 等 - 2017 - DOI: 10.1590/0370-44672016700069 -
Acetate pouzdanost 1,0
“furan ring asymmetrical stretching (C-O-C) In the XRD curve of β-cyclodextrin, a strong peak cm-1 12.7o is due to The strong sharp peak that occurs at 735 as shown in Fig.”
Zhu 等 - 2021 - Formation and characterization of furfuryl mercapt DOI: 10.2478/pjct-2021-0035 -
pouzdanost 0,9
“Peak area between 735 and 715 reflects amorphous linear paraffin fraction.”
Variable-temperature Fourier-transform infrared spectroscopy study of wax precipitation and melting in Canadian and Venezuelan asphalt binders DOI: 10.1016/j.conbuildmat.2020.120212 -
pouzdanost 0,9
“Peak near 735 cm-1 attributed to SiC crystalline.”
Sha 等 - 2005 - The structure and photoluminescence properties of DOI: 10.1016/j.physleta.2005.07.048 -
Metal oxygen pouzdanost 0,9
“assigned to Al-O absorption”
Heteroployacid on the composite of boehmite and polyionic liquid as a catalyst for alcohol oxidation and tandem alcohol oxidation Knoevenagel condensation reactions DOI: 10.1038/s41598-022-20699-2
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