What absorbs at 2335 cm⁻¹ in an FTIR spectrum?
A band near 2335 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
Hiter odgovor
A band near 2335 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.
Možne dodelitve funkcionalnih skupin
| Funkcionalna skupina | Podporna dejstva | Citirani viri | Najvišje zaupanje |
|---|---|---|---|
| Thiol | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
Razvrstitev odraža zbrane literaturne dokaze, ne enega avtoritativnega pravila. Vedno preverite glede na kontekst vašega vzorca.
Možni materiali
| Material | Podporni vrhovi | Prekrivajoče se skupine | Citirani viri |
|---|---|---|---|
| polyurethanes | 2335, 1740, 1728 | Methacrylate, Urethane | 1 |
| edible oils | 2335, 1743, 1064 | Methacrylate | 1 |
| GO | 2335, 1720, 1182 | Methacrylate | 1 |
| RGO | 2335, 2358, 2930 | Methacrylate | 1 |
Materiali so prikazani le, ko ista literaturna podlaga podpira ta pas in vsaj en 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 2335 cm⁻¹ is usually not enough for material identification by itself.
Uporaba v resničnem svetu
Ta vrsta poizvedbe je pogosta pri identifikaciji polimerov, pregledovanju neznanih plastičnih mas, odpravljanju težav pri QC, preverjanju recikliranih materialov in literaturno podprtem pregledu dodelitev vrhov.
Pogoste napake
- Obravnavanje enega izoliranega pasu kot dokaza o materialu brez preverjanja vsaj enega ali dveh podpornih vrhov.
- Ignoriranje prekrivanja: več funkcionalnih skupin lahko prispeva blizu istega valovnega števila.
- Izpuščanje validacije, ko lahko dodatki, mešanice, oksidacija ali kontaminacija popačijo spekter.
Nasvet za preverjanje
Ko ostaja dvoumnost, potrdite hipotezo z DSC, GC-MS ali TGA, zlasti za mešanice, degradirane vzorce in polnjene polimere.
Literatura za temi dodelitvami
-
Acetate zaupanje 1,0
“However, the three cm-1 peaks appearing in the range between 2270 and 2410 are attributed to urethane groups, while the absorption peak cm-1 at 2335 might be due to C=O stretching (bonded) in cm-1are urethane.”
Analysis of silver nanoparticles produced by chemical reduction of silver salt solution DOI: 10.5755/j01.ms.22.4.12503 -
Carbon dioxide zaupanje 1,0
“Characteristic cm(cid:1)1 in the carbon dioxide bands at 2335 and 2366 assigned to bands for small (dimeric) and larger water clusters, and bulk- (cid:5)3600, dioxide51 shows that it asymmetric stretching modes of carbon like water are dist”
Ngoc Minh Nguyen Huynh 等 - 2018 - Reduced graphene oxide as a water, carbon dioxide DOI: 10.1039/c8ra03080d -
Thiol zaupanje 1,0
“cm(cid:2)1 S-H The characteristic bands of at 2335 and 2362 were still γ A method of grafting a mesoporous -alumina layer, supported present with no change in intensity.”
PDMS grafting of mesoporous γ-alumina membranes for nanofiltration of organic solvents DOI: 10.1016/j.memsci.2014.07.010 -
zaupanje 0,9
“CO absorption band”
Stoichiometric Determination of Moisture in Edible Oils by Mid-FTIR Spectroscopy DOI: 10.1016/j.aca.2016.03.016
Imate spekter s tem pasom?
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