What absorbs at 2869 cm⁻¹ in an FTIR spectrum?
A band near 2869 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
Ateb cyflym
A band near 2869 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.
Aseiniadau grŵp swyddogaethol posibl
| Grŵp swyddogaethol | Ffeithiau ategol | Ffynonellau a ddyfynnwyd | Hyder uchaf |
|---|---|---|---|
| Alkyl C-H | 12 | 12 | 1.0 |
| Aldehyde (CHO) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
Mae＇r safle＇n adlewyrchu tystiolaeth llenyddiaeth gronnwyd, nid rheol awdurdodol sengl. Cadarnhewch bob amser yn erbyn eich cyd-destun sampl.
Deunyddiau posibl
| Deunydd | Copaon ategol | Grwpiau sy＇n gorgyffwrdd | Ffynonellau a ddyfynnwyd |
|---|---|---|---|
| polyurethanes | 2869, 1740, 1728 | Alkyl C-H | 1 |
| HCl | 2869, 1708, 1032 | Carbohydrate | 1 |
| graphite | 2869, 1640, 1326 | Alkyl C-H | 1 |
Mae deunyddiau＇n cael eu dangos dim ond pan fydd yr un gronfa lenyddiaeth yn cefnogi＇r band hwn ac o leiaf un brig nodweddiadol ychwanegol.
Rhesymeg sbectrwm
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 2869 cm⁻¹ is usually not enough for material identification by itself.
Defnydd yn y byd go iawn
Mae＇r math hwn o ymholiad yn gyffredin mewn adnabod polymer, sgrinio plastig anhysbys, datrys problemau QC, dilysu deunydd wedi＇i ailgylchu, ac adolygiad o aseiniad copa wedi＇i gefnogi gan lenyddiaeth.
Camgymeriadau cyffredin
- Trin un band ynysig fel prawf o ddeunydd heb wirio o leiaf un neu ddau gopa cefnogol.
- Anwybyddu gorgyffwrdd: gall grwpiau swyddogaethol lluosog gyfrannu ger yr un rhif ton.
- Hepgor dilysu pan fo ychwanegion, cymysgeddau, ocsideiddio, neu halogiad yn gallu ystumio＇r sbectrwm.
Cyngor dilysu
Pan fo amwysedd yn parhau, dilyswch y rhagdybiaeth gyda DSC, GC-MS, neu TGA, yn enwedig ar gyfer cymysgeddau, samplau dirywiedig, a pholymerau llawn.
Llenyddiaeth y tu ôl i＇r aseiniadau hyn
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Alkyl C-H hyder 1.0
“More invasive and time consuming vibration of the lipid hydrocarbon tail was observed at 2921 and 2854 cm-1 (CH 2), as well methods are used to identify the exact chemical composition, such as gas chromatography as at 2960 and 2869 cm-1 (CH”
Assessing the Biofilm Formation Capacity of the Wine Spoilage Yeast Brettanomyces bruxellensis through FTIR Spectroscopy DOI: 10.3390/microorganisms9030587 -
Alkyl C-H hyder 1.0
“asym ν methylene (CH 2), C-H asymmetric stretching 2927 asym ν methyl (CH 3), C-H symmetric stretching 2869 sym ν vinyl (C=C), stretching (origin CH=CH) 1629”
Filip 等 - 2013 - Investigation of thermal and catalytic degradation DOI: 10.2478/s11532-013-0202-y -
Alkyl C-H hyder 1.0
“LLM confirmed rule peak-group candidate”
Physicochemical Properties of Membrane Adsorber from Palm Empty Fruit Bunch (PEFB) by Acid Activation DOI: 10.3390/membranes11120917 -
Alkyl C-H hyder 1.0
“(C-H PEG, such as methylene stretch near 2869, 2826 and thesp2 This E phonon of carbonatoms.”
Huang 等 - 2019 - Effects of poly(ethylene glycol)-grafted graphene DOI: 10.1039/c9ra01060b -
Alkyl C-H hyder 1.0
“CH symmetric stretching”
Kavanaugh 等 - 2016 - Human mesenchymal stem cell behavior on segmented DOI: 10.1007/s10856-015-5654-5. -
Alkyl C-H hyder 1.0
“LLM confirmed rule peak-group candidate”
Mir 等 - 2022 - Chemical composition and insecticidal activity of DOI: 10.47665/tb.39.2.005 -
Alkyl C-H hyder 1.0
“LLM confirmed rule peak-group candidate”
Effects of Various Types of Expandable Graphite and Blackcurrant Pomace on the Properties of Viscoelastic Polyurethane Foams DOI: 10.3390/ma14071801 -
Alkyl C-H hyder 1.0
“LLM confirmed rule peak-group candidate”
Design and Synthesis of Amphiphilic Graft Polyphosphazene Micelles for Docetaxel Delivery DOI: 10.3390/pharmaceutics15051564
Oes gennych sbectrwm gyda＇r band hwn?
Llwythwch eich sbectrwm FTIR i fyny a chael adroddiad dehongli llawn — aseiniadau brig gyda chyfeiriadau llenyddiaeth, cyfateb llyfrgell, a chadwyn dystiolaeth â gradd hyder — mewn eiliadau.