What absorbs at 2137 cm⁻¹ in an FTIR spectrum?
A band near 2137 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 3 cited sources
Brzi odgovor
A band near 2137 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 1 | 1 | 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 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| AuNPs | 2137, 1646, 1721 | Hydroxyl (O-H), Methacrylate | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
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 2137 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
-
Carbonyl (C=O) pouzdanost 1,0
“The peak value at 2137, and 3391 The presence of alkyl, benzyl, methyl, 500 nm showed a characteristic wavelength for the synthesis and carbonyl groups in the molecule and the polar groups like -OH -NH of gold nanoparticles to increase in a”
Biogenic Synthesis of Gold Nanoparticle from Enicostema axillare and Their In Vitro Cytotoxicity Study Against MCF-7 Cell Line DOI: 10.1007/s12668-019-00656-6 -
Alkyl C-H pouzdanost 1,0
“cm-1 sample a showed five peaks at 1850, 1994, 2021, 2058, and 2137 The peak at 2137 was cm-1 assigned to the free CO dissolved in CH 2Cl [24, 27].”
High-yield synthesis of PVP-stabilized small Pt clusters by microfluidic method DOI: 10.1016/j.cattod.2011.10.008 -
Acetate pouzdanost 1,0
“The peak at 2152 cm-1 with a shoulder peak at 2137 cm-1 is attributed to the C-O vibration on isolated Pd2+ bonded with the hydroxy of”
Zhang 等 - 2019 - Investigation of Various Pd Species in PdBEA for DOI: 10.3390/catal9030247
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