Hvad absorberer ved 1237 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1237 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 1237 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 | 6 | 6 | 1,0 |
| Methoxy (OCH3) | 5 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Amide | 5 | 4 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Lignin | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| C c single bond | 3 | 3 | 1,0 |
| Carbohydrate | 3 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Hydrogen bond | 2 | 1 | 1,0 |
| Nucleic acid | 2 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Sulfonate | 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 |
|---|---|---|---|
| PMMA | 1237, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| lignin | 1237, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| saliva | 1237, 1648, 1664 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| collagen | 1237, 1408, 1660 | Methacrylate, Acetate, Methoxy (OCH3) | 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 1237 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
-
C c single bond tillid 1,0
“cm-1 1500 and 1385 The peak between 1237 and 1268 is attributed to C-C-O stretching vibrations of the methyl carbonyl group.”
Prasad 和 Lal - 2023 - Spectroscopic Investigations of Optical Bandgap an DOI: 10.33263/BRIAC132.187 -
Acetate tillid 1,0
“Additionally, the band at 1237 cm-1 was attributed to the symmetric C-O-C stretching vibration [12,35].”
Preparation and Characterization of Polymer Membranes Impregnated with Carbon Nanotubes for Olive Mill Wastewater DOI: 10.3390/polym14030457 -
Nucleic acid tillid 1,0
“The PO2asymmetric stretch at 1237 which represents DNA [44], showed the highest expression in PDRm, lower in ERMi, and it was absent in PVRm (Figure 4A), suggesting possible higher cell content in PDRm.”
Andjelic 等 - 2023 - Characterization of Different Types of Epiretinal DOI: 10.3390/ijms24054834 -
Amide tillid 1,0
“(2016) 73:1247-1265 cm-1 cm-1 deformation, second amide band) as well as at 1237 and at 774 (C-N stretching, third and fourth amide band).”
Thermal and surface properties of hybrid materials obtained from epoxy-functional urethane and siloxane DOI: 10.1007/s00289-015-1545-7 -
Amide tillid 1,0
“The FTIR spectrum of almost all samples examined showed the characteristic FTIR features of biological samples: the peaks of proteins at 1656-1642 cm-1 (Amide I, C=O stretching), 1542 cm-1 (Amide II, N-H bending), and 1237 cm-1 (Amide III);”
The Role of the Preanalytical Step for Human Saliva Analysis via Vibrational Spectroscopy DOI: 10.3390/metabo13030393 -
Hydroxyl (O-H) tillid 1,0
“The absorption at 1237 was the cm-1, bending of O-H [26].”
Variety Identification of Orchids Using Fourier Transform Infrared Spectroscopy Combined with Stacked Sparse Auto-Encoder DOI: 10.3390/molecules24132506 -
Carbohydrate tillid 1,0
“cm-1 cm-1) CD-WS, the intensity of the hemicellulose bands (1726 cm-1 and 1237 cm-1) decreased in treatments CD-WS, the intensity of the hemicellulose bands (1726 and 1237 decreased in treatments with P.”
Fornito 等 - 2020 - Degradative Ability of Mushrooms Cultivated on Cor DOI: 10.3390/molecules25133020 -
Amide tillid 1,0
“LLM confirmed rule peak-group candidate”
Investigate the role of fungal communities associated with a historical manuscript from the 17th century in biodegradation DOI: 10.1038/s41529-022-00296-4
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