What absorbs at 2843 cm⁻¹ in an FTIR spectrum?
A band near 2843 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
Hurtigt svar
A band near 2843 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Alkyl C-H | 8 | 8 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 0 | 1,0 |
| Carbonyl (C=O) | 1 | 0 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| Nanocellulose | 2843, 1540, 1646 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
| lignin | 2843, 1035, 1510 | Alkyl C-H, Methacrylate, Methoxy (OCH3) | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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 2843 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Alkyl C-H tillid 1,0
“LLM confirmed rule peak-group candidate”
Altuntas 等 - 2017 - Biodegradation Properties of Wood-plastic Composit DOI: 10.1002/app.24358 -
Alkyl C-H tillid 1,0
“Theabsorptionbands The absorption bands at 2941 and 2843 cm-1 characteristic for the C-H bond in -CH3 and -CH2 groups cm-1 at 2941 and 2843 characteristic for the C-H bond in -CH and -CH groups occur at K_M10P, 3”
Bacterial Nanocellulose from Side-Streams of Kombucha Beverages Production: Preparation and Physical-Chemical Properties DOI: 10.3390/polym9080374 -
Alkyl C-H tillid 1,0
“Thiocarbonyl 3375-3213cm-1 attributed to v(N-H), while peaks corat and carbonyl group appeared at higher chemical shift due to responding to long alkyl chain were observed at 2933formation of intramolecular hydrogen bonding and different 28”
Nordin 等 - 2017 - Novel Synthetic Monothiourea Aspirin Derivatives B DOI: 10.1155/2017/2378186 -
Alkyl C-H tillid 1,0
“Stretching D 2842.879 C-H Stretching E”
Untargeted Metabolomics Analysis Using FTIR and UHPLC-Q-Orbitrap HRMS of Two Curculigo Species and Evaluation of Their Antioxidant and -Glucosidase Inhibitory Activities DOI: 10.3390/metabo11010042 -
Alkyl C-H tillid 1,0
“and 2937 cm-1 and 2843 cm-1 for C-H bonds (stretching vibrations), 1690 cm-1”
Zdarta 等 - 2017 - Lipase B from Candida antarctica Immobilized on a DOI: 10.3390/catal7010014 -
Alkyl C-H tillid 1,0
“cm-1 The intensity in 2843 cm-1 (CH2 stretch vibration) increased compared to the reference lignin could The intensity in 2843 (CH stretch vibration) increased compared to the reference lignin could 2 be caused by the extended side chain in”
Heat-Induced Discoloration of Chromophore Structures in Eucalyptus Lignin DOI: 10.3390/ma11091686 -
Alkyl C-H tillid 1,0
“The stretching vibration characteristic peaks of -CH2/-CH3 were located at 2917 and 2843 cm-1.”
Zou 等 - 2022 - Dispersion of sodium phytate on muscovite and the DOI: 10.37190/ppmp/154951 -
Alkyl C-H tillid 0,9
“Signals between 2918 and 2843 due to modification with HDTMA”
Ramirez-Gomez 等 - 2019 - Synthesis and Characterization of Clay Polymer Nan DOI: 10.3390/polym11040721
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