Hvad absorberer ved 1141 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1141 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 1141 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 |
|---|---|---|---|
| C-O single bond | 8 | 8 | 1,0 |
| Methoxy (OCH3) | 6 | 6 | 1,0 |
| Methacrylate | 6 | 6 | 1,0 |
| Acetate | 6 | 6 | 1,0 |
| Alkyl C-H | 5 | 4 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 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 |
|---|---|---|---|
| PVA | 1141, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| polypyrrole | 1141, 1700, 400 | Methacrylate, Acetate | 1 |
| polyvinyl alcohol | 1141, 1640, 1537 | Methacrylate, Acetate | 1 |
| PEG | 1141, 1650, 1342 | Methacrylate, Acetate, C-O single bond | 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 1141 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
-
Aromatic ring tillid 1,0
“The strongest peak appears at 1141 which arise from the stretching cm-1 cm-1 vibration of C═N from quinoid ring protonated.”
International Conference on Innovation on Polymer Science and Technology DOI: 10.1088/1757-899X/223/1/012051 -
N h tillid 1,0
“The three sericin-PVA showed weak to aldehyde group with OH groups of the PVA chain medium, broad hydrogen-bonded bands that result from the or possibly the contribution of the remaining acetate groups of structure.23 overlap of free and bo”
Manesa 等 - 2022 - Fabrication and Characterization of Sericin-PVA Co DOI: 10.1021/acsomega.2c00897 -
Alkyl C-H tillid 1,0
“The band at 1141 is attrib(cid:2) group in uted to the C-H bending vibration of -CH The FTIR spectra of the thermally polymerized”
Surender 等 - 2014 - Bismaleimide and Bispropargyl Ether Blends Curing DOI: 10.1134/S1560090414050157 -
Acetate tillid 1,0
“While the peak at 1141 indicates the stretching of C-O cm-1 from the crystalline sequence of PVA, the peak at 1073 indicated the stretching of C-O from the amorphous sequence of PVA [23].”
Poly(vinyl alcohol) Nanocomposites Reinforced with Bamboo Charcoal Nanoparticles: Mineralization Behavior and Characterization DOI: 10.3390/ma8084895 -
Alkyl C-H tillid 1,0
“temperature is lower than 45 °C, which is attributed to the cm-1 C-H An important absorbance peak at 1141 is usually minor influence of the diffused water on the bonds.”
Xue 等 - 2015 - Moving-window two-dimensional correlation infrared DOI: 10.1007/s00216-015-9035-1 -
C-O single bond tillid 1,0
“but when sodium alginate was present in large quantities and was highly concentrated, three peaks that express the functional group's formula appeared, with absorption ranges cm-1 cm-1 of 1141 and 1268 due to the extended vibration of the C”
ALSamman 和 Sanchez - 2023 - Adsorption of Copper and Arsenic from Water Using DOI: 10.3390/polym15092192 -
Acetate tillid 1,0
“Finally, the bands at 1141 and 843 water, glycerol and diiodomethane on the PU As are due C-O-C expected, the hydrophilicity of the substrata increased with to the asymmetric and symmetric vibrations, PEG grafting density as shown by the wa”
Effect of PEG grafting density on surface properties of polyurethane substrata and the viability of osteoblast and fibroblast cells DOI: 10.1007/s10856-022-06668-1 -
N-O bond tillid 1,0
“Fe-O vibrational 1003cm-1 modes in FeOOH were ascribed at 1640, 1363, and for the PPy NPs peak at due to the out-of-plane 1141cm-1 in the PFFs spectra while there were no peaks in bending C-H bond [31, 34-36].”
Diauudin 等 - 2020 - Preparation and Characterisation of Polypyrrole-Ir DOI: 10.1155/2020/8762969
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