What absorbs at 856 cm⁻¹ in an FTIR spectrum?
A band near 856 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 8 cited sources
Brzi odgovor
A band near 856 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 |
|---|---|---|---|
| Alkyl C-H | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 1 | 1,0 |
| Carbohydrate | 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 |
| Carbonate | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Lignin | 1 | 0 | 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 |
|---|---|---|---|
| PVA | 856, 1660, 2930 | Alkyl C-H, Acetate, Methacrylate | 1 |
| MWCNT | 856, 2876, 1430 | Alkyl C-H, Methoxy (OCH3), Methacrylate | 1 |
| Cellulose | 856, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| lignin | 856, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 1 |
| poly(vinyl alcohol) | 856, 1700, 2993 | Acetate, Methacrylate, Alkyl C-H | 1 |
| CeO2 | 856, 1554, 1630 | Acetate, Methacrylate, 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 856 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
-
C c single bond pouzdanost 1,0
“4 (a)] showed features spectrum band at 2946.67 1 cm-1 (stretching vibration of C-H from alkyl group), 1142.72 ( C-O stretching vibration, 1436.69 cm-1 cm-1 cm-1 (-CH 2stretching), 855.72 (C-C stretching) and the absorption band at 3631.72”
Sprayed in-situ synthesis of Polyvinyl alcohol/Chitosan loaded Silver nanocomposite hydrogel for improved antibacterial effects DOI: 10.1016/j.ijbiomac.2019.09.186 -
Oxygen heterocycle pouzdanost 1,0
“Pure epoxy resin showed peaks near 856 which might be due to oxirane functionality of the epoxidized novolac resin.”
Srivastava 等 - 2018 - Studies on the structural changes during curing of DOI: 10.1016/j.saa.2017.06.066 -
Carbonate pouzdanost 1,0
“In addition, characteristic bands of bidentate carbonates can be visualized at 1576, 1290, 1013, and 856 cm-1, corresponding to the stretching modes υas (CO3) for the first two bands, υs (CO3) for the following, and π (CO3) for the last [88”
CO2 Methanation over Nickel Catalysts: Support Effects Investigated through Specific Activity and Operando IR Spectroscopy Measurements DOI: 10.3390/catal13020448 -
Alkyl C-H pouzdanost 1,0
“for example, Figure single aryl CH vibration was observed at 856 for lignin g-h °C, shows foams fabricated at 300, 500, 700, and 900 and but was not observed for WS or SBP (Figure 4a,d).”
Gupta 等 - 2020 - On the Design of Novel Biofoams Using Lignin, Whea DOI: 10.1021/acsomega.0c00721 -
Acetate pouzdanost 1,0
“The absorbance bands around 856, 930, 996, 1077, 1149, cm-1 and 1242 were related to the C-O stretching, C-H rocking vibrations, and C-O-C”
Extraction and Characterization of Potential Biodegradable Materials Based on Dioscorea hispida Tubers DOI: 10.3390/polym13040584 -
pouzdanost 1,0
“Figure 6e,f present Ni 2p XPS spectra, revealing the existence of peaks at binding energies 855.5 eV and 873.4 eV representing Ni 2p and Ni 2p 1/2, respectively, and the separating energy is”
Nickel Oxide-Carbon Soot-Cellulose Acetate Nanocomposite for the Detection of Mesitylene Vapour: Investigating the Sensing Mechanism Using an LCR Meter Coupled to an FTIR Spectrometer DOI: 10.3390/nano -
pouzdanost 1,0
“The Ni2p spectrum displays a main peak at 856.1 eV attributed to Ni(OH) 2.”
Synthesis of NiFeOx nanocatalysts from metal–organic precursors for the oxygen evolution reaction DOI: 10.1039/D2DT01370C -
pouzdanost 1,0
“Peaks at 855.65 and 872.90 eV indicates to Ni 2p3/2 2p1/2 and Ni energy levels, respectively.”
Ni(OH)2-decorated nitrogen doped MWCNT nanosheets as an efficient electrode for high performance supercapacitors DOI: 10.1038/s41598-019-42281-z
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