What absorbs at 3269 cm⁻¹ in an FTIR spectrum?
A band near 3269 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
Hiter odgovor
A band near 3269 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| N h | 2 | 2 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Hydrogen bond | 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.
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 3269 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
-
zaupanje 1,0
“The FTIR spectra of present a short single cm-1 4b peak at 3269.34 that belongs to the N-H group, while spectra of show no DOI: 10.22146/ijc.76802 cm-1 due to its tertiary amide structure.”
Rasyid 等 - 2022 - Synthesis of N-phenethyl-p-methoxycinnamamide and DOI: 10.22146/ijc.76802 -
Hydroxyl (O-H) zaupanje 1,0
“Additionally, it is obvious from the cm-1 spectra that the intensity of the OH-stretching band centred at 3269 decreased gradually”
Belhadj 等 - 2016 - Pathways of the photocatalytic reaction of acetate DOI: 10.1016/j.jcat.2016.08.006 -
Hydroxyl (O-H) zaupanje 1,0
“broadabsorptionsareregisteredat3269cm-1 (PVA)and3356cm-1 ForbothPVAandCAR,strong, For both PVA and CAR, strong, broad absorptions are registered at 3269 cm-1 (PVA) and 3356 ν(O-H) (CAR), attributed to the stretching vibration from hydrogen-”
Croitoru 等 - 2020 - Physically Crosslinked Poly (Vinyl Alcohol)Kappa- DOI: 10.3390/polym12030560 -
Acetate zaupanje 1,0
“The strongest intensity in IR band located at 3269 is assigned to the C=O stretching vibration of the chelation structure of and hydrogen bonds.”
Molecular Structures and Spectral Properties of Natural Indigo and Indirubin: Experimental and DFT Studies DOI: 10.3390/molecules24213831 -
C-O single bond zaupanje 1,0
“Vibration Assignation Reference 3269 -C-OH(stretching) Water,cabohydrates”
Antioxidant and antidiabetic activities of a polyphenol rich extract obtained from Abelmoschus esculentus (okra) seeds using optimized conditions in microwave-assisted extraction (MAE) DOI: 10.3389/fnut.2022.1030385 -
Hydroxyl (O-H) zaupanje 0,7
“Strong peak assigned to hydroxyl and amino groups based on context.”
Removal mechanism of Pb(II) by Penicillium polonicum: immobilization, adsorption, and bioaccumulation DOI: 10.1038/s41598-020-66025-6
Imate spekter s tem pasom?
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