What absorbs at 3169 cm⁻¹ in an FTIR spectrum?
A band near 3169 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 4 cited sources
Brzi odgovor
A band near 3169 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 |
|---|---|---|---|
| N h | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Amide | 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 |
|---|---|---|---|
| bio-based | 3169, 1720, 1740 | Carbonyl (C=O), Hydroxyl (O-H), N h | 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 3169 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
-
Amide pouzdanost 1,0
“Peaks at 3169, 3320, and andasymmetric-CH3 stretchesandthebroadpeaksat30943410cm-1 secondary amide N-H stretches as well as primary amine Ndue to the presence of the secondary amide/NHstretches,andthestrongpeakat1568cm-1 ischaracteristic H”
Alexander 等 - 2016 - Carboxylation and Decarboxylation of Aluminum Oxid DOI: 10.1155/2016/7950876 -
Hydroxyl (O-H) pouzdanost 1,0
“explicit assignment in text”
James 等 - 2022 - Synthesis and Characterization of Novel Nano-carbo DOI: 10.15376/biores.17.3.4452-4469 -
Carbonyl (C=O) pouzdanost 1,0
“Moreover, cm(cid:3)1 O-H 1 shows the stretching vibration peak at 3169 assothe theoretical spectrum also reveals the carbonyl peak at ciated with the presence of hydroquinone, while the peak cm(cid:3)1.”
A comparison of experimental and theoretical studies of benzoquinone modified poly(thiophene): effect of polymerization techniques on the structure and properties DOI: 10.1039/d0ra07714c -
N h pouzdanost 1,0
“The peaks at 3169 and 1401 were identi ed as NH stretching and -P=O(O-NH 4+) scissoring vibration, which belonged to the unreacted groups on CADP-cotton.”
Xu 等 - 2022 - Durable and high-efficiency casein-derived phospho DOI: 10.21203/rs.3.rs-884727/v1
Imate li spektar s ovom vrpcom?
Prenesite svoj FTIR spektar i dobijte potpuno izvješće o interpretaciji — dodjele vrhova s literaturnim citatima, podudaranja knjižnice i lanac dokaza s ocjenom pouzdanosti — u sekundama.