Hvad absorberer ved 2923 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 2923 cm⁻¹ kan pege på flere funktionelle grupper. Nedenfor er de mest sandsynlige tildelinger, rangeret efter hvor meget publiceret bevis der understøtter hver — hver enkelt spores til litteratur (DOI) og krydsvalideres mod vores 130.000+ referencespektre og vidensgraf.
Backed by 8 cited sources
Hurtigt svar
Et bånd nær 2923 cm⁻¹ fortolkes normalt ved at kontrollere, hvilke funktionelle grupper der gentagne gange forekommer der i litteraturen, og derefter bekræfte mindst en eller to yderligere peaks i den samme prøve. Denne side rangerer disse tildelinger efter akkumuleret evidens snarere end efter en enkelt fast lærebogsregel.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Alkyl C-H | 85 | 77 | 1,0 |
| Hydroxyl (O-H) | 11 | 10 | 1,0 |
| Amide | 6 | 6 | 1,0 |
| Methyl | 6 | 6 | 1,0 |
| N h | 5 | 5 | 1,0 |
| Secondary amine | 5 | 5 | 1,0 |
| Carboxyl (COOH) | 5 | 5 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Lipid | 4 | 4 | 1,0 |
| Carbohydrate | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Hydrogen bond | 3 | 3 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Silicate | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Fatty acid | 1 | 0 | 1,0 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| TiO2 | 2923, 1700, 1093 | Hydroxyl (O-H), Alkyl C-H | 1 |
| Fe3O4 | 2923, 2358, 1673 | Hydroxyl (O-H), Alkyl C-H, Amide | 1 |
| Al2O3 | 2923, 1722, 1383 | Hydroxyl (O-H), Alkyl C-H | 1 |
| iron oxide | 2923, 1130, 891 | Alkyl C-H, Hydroxyl (O-H), Methyl | 1 |
| Fe3O4 nanoparticles | 2923, 1673, 1470 | Hydroxyl (O-H), Alkyl C-H, Amide | 1 |
| iron oxide nanoparticles | 2923, 2972, 528 | Hydroxyl (O-H), Alkyl C-H | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
Dette bånd bliver meningsfuldt kun, når det læses sammen med sine nabotoppe. I praksis ser analytikere først på tildelingerne ovenfor, og kontrollerer derefter, om den samme prøve også viser andre toppe, der forventes for det samme strukturelle motiv. Et enkelt bånd nær 2923 cm⁻¹ er normalt ikke nok til materialeidentifikation alene.
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
“All cm-1 to the O-H stretching, 2923 due to the C-H stretching, liquids were directly used as received and their surface tenthese cm-1 cm-1 1642 due to the H-O-H bending, 1155 due to the C-O sion and related components, e.g.”
Studies and comparison of the liquid adsorption and surface properties of α-, β- and γ-cyclodextrins by FTIR and capillary rise method DOI: 10.1016/j.colsurfa.2012.07.003 -
Alkyl C-H tillid 1,0
“The AGDM spectra showed the peaks at 3473 for the cm-1 NH-stretching, 2923 for asymmetrical CH stretching.”
Dhasmana 等 - 2019 - Silk fibroin protein modified acellular dermal mat DOI: 10.1016/j.msec.2018.12.038 -
Alkyl C-H tillid 1,0
“Peaks at 2923 and 2853 were mainly associated with the hydrocarbon chains of the lipids or lignins [40].”
Comparative Analysis of the Phenolic Profile of Lycium barbarum L. Fruits from Different Regions in China DOI: 10.3390/molecules27185842 -
tillid 1,0
“FTIR results cm-1 of HNO treated coal clearly indicated the presence of N-H group peak at 2923.04 in 3 cm-1, case of bituminous coal and introduction of the nitro group in lignite coal at 2921.84 while both peaks were absent in native coal”
Fatima 等 - 2021 - Extraction and Chemical Characterization of Humic DOI: 10.3390/su13168969 -
Alkyl C-H tillid 1,0
“The (OH stretch), 2923 (CH stretch), MATERIALS TECHNOLOGY 5 Figure 4.”
Functionalised nanoformulation of Swertiamarin with enhanced stability and hemocompatibility: synthesis, characterisation and anticancer evaluation DOI: 10.1080/10667857.2020.1769260 -
Hydroxyl (O-H) tillid 1,0
“The peak at 2922.98 cm belongs to the stretching vibration of OH which represents the stretching vibration of (PEG) -CH that is absorbed by Fe 3O 2”
ENHANCEMENT OF THERMAL IMAGING BY IRON OXIDE NANOPARTICLE – PRELIMINARY STUDY DOI: 10.1016/j.bcab.2018.12.005 -
Hydroxyl (O-H) tillid 1,0
“cm-1 cm-1 O-H C-H to stretching, sharp peaks at 2923.2 and 2854.2 were attributed to stretching, cm-1 was due to C = O of carboxyl groups.”
Kumar 和 Sidharth - 2018 - Some Studies on use of ternary blends of diesel, b DOI: 10.1080/15567036.2018.1486902 -
Alkyl C-H tillid 1,0
“Peaks at 2923 and 2852 corresponds to the 3 C-H stretching of hydrocarbon bonds of DDA, which are very weak in as composite powders.”
Structural, optical, morphological and thermal properties of TiO2–Al and TiO2–Al2O3 composite powders by ball milling DOI: 10.1016/j.physleta.2017.02.053
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