What absorbs at 2141 cm⁻¹ in an FTIR spectrum?
A band near 2141 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 5 cited sources
Brzi odgovor
A band near 2141 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 |
|---|---|---|---|
| Adsorbed carbon monoxide | 2 | 2 | 1,0 |
| C#c | 1 | 1 | 1,0 |
| Silicon hydride | 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 |
| N n bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 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 |
|---|---|---|---|
| water | 2141, 1018, 2945 | Methoxy (OCH3) | 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 2141 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
-
Hydroxyl (O-H) pouzdanost 1,0
“2325.00 2349.47, 2817.79, 2124.28, 1905.70, 1444.61, 1123.54, and 529.99 were 2337.64 assigned to O-H stretching, alcohol, O-H stretching, carboxylic acid, - - 2140.59 2124.28 carbodiimide (N=C--N C-- = N N stretching, allene, C-H bending,”
Preparation and characterization of activated carbon from agricultural wastes and their ability to remove chlorpyrifos from water DOI: 10.1016/j.toxrep.2023.01.011 -
Silicon hydride pouzdanost 1,0
“and SiH stretching vibration at 2141 The absorption peaks position and identification of SiH bonds in the spectral range 3 x cm-1 from 2050 to 2150 are listed in Tab.”
Kralik 和 Kopani - 2023 - Analysis of porous silicon structures using FTIR a DOI: 10.2478/jee-2023-0028 -
C#c pouzdanost 1,0
“At peak with wave numbers 2140.99 cm-1 and 2059.98 , corresponds to the absorption caused by the triple bonds of C≡C (alkaline type cm-1”
Maulida 等 - 2018 - Utilization of mango seed starch in manufacture of DOI: 10.1088/1748-0221/5/10/P10010/pdf -
Adsorbed carbon monoxide pouzdanost 1,0
“The relevant features of the spectrum of CO adsorbed at 60 K (Figure 3) are: a) a broad and highly cm-1 cm-1, reversible band at 2141 due to physically adsorbed CO;”
Mino 等 - 2012 - Particles Morphology and Surface Properties As Inv DOI: 10.1021/jp303942h -
Adsorbed carbon monoxide pouzdanost 1,0
“The relevant features of the spectrum of CO adsorbed at 60 K (Figure 3) are: a) a broad and highly cm-1 cm-1, reversible band at 2141 due to physically adsorbed CO;”
Mino 等 - 2013 - Rutile Surface Properties Beyond the Single Crysta DOI: 10.1021/jp401916q
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