Hvad absorberer ved 1044 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1044 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 1044 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 | 16 | 16 | 1,0 |
| Acetate | 14 | 14 | 1,0 |
| Methoxy (OCH3) | 13 | 13 | 1,0 |
| Methacrylate | 13 | 13 | 1,0 |
| Carbohydrate | 5 | 5 | 1,0 |
| Phosphate (PO4) | 4 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Nucleic acid | 2 | 2 | 1,0 |
| S eq o | 2 | 2 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Thiol | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 0,9 |
| Aldehyde (CHO) | 1 | 1 | 0,9 |
| Alkyl C-H | 1 | 1 | 0,7 |
| Phospholipid | 1 | 1 | 0,7 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| cellulose | 1044, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| lignin | 1044, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| kraft lignin | 1044, 1744, 1710 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| chitosan | 1044, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| glycerol | 1044, 1585, 1630 | 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 1044 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
-
Acetate tillid 1,0
“Another cm-1 obvious sharp peak credited to the C-O stretching is observed at 1044, 1043, and 1039”
Structural, Electrical and Electrochemical Properties of Glycerolized Biopolymers Based on Chitosan (CS): Methylcellulose (MC) for Energy Storage Application DOI: 10.3390/polym13081183 -
Acetate tillid 1,0
“However, as the number of lithium ions increased, the interactions between the lithium ions and the oxygen atoms (C=O) in the acetate ions or the carboxylate ions became more cm-1 dominant, and therefore the intensity of the peak at 1044 de”
Mobarak 等 - 2015 - Carboxymethyl Carrageenan Based Biopolymer Electro DOI: 10.1016/j.electacta.2015.02.200 -
tillid 1,0
“x cm-1, cm-1, He/O 1044 Si-O-Si network stretch at 1107 and Si-O-Si the treated sample compared to the O ashed film can be 2 2 cm-1.”
Vinogradova 等 - 2008 - Application of deuterium exchange to analyze moist DOI: 10.1149/1.2947786(cid:2) -
Carbohydrate tillid 1,0
“expressive increase in the intensity of the peaks near 1044 and 1075 Lipids cm(cid:5)1, related to soluble sugars in general, structural carbohydrates and Nucleicacids components with phosphorus in its composition.”
Modelling the vigour of maize seeds submitted to artificial accelerated ageing based on ATR-FTIR data and chemometric tools (PCA, HCA and PLS-DA) DOI: 10.1016/j.heliyon.2020.e03477 -
Acetate tillid 1,0
“The highest peaks at 1086 and cm-1 1044 are ascribed to the C-O stretch absorption bands, which are important regions for ethanol 1044 cm-1 are ascribed to the C-O stretch absorption bands, which are important regions for ethanol and methan”
Application of Functional Data Analysis and FTIR-ATR Spectroscopy to Discriminate Wine Spirits Ageing Technologies DOI: 10.3390/math8060896 -
N-O bond tillid 1,0
“~1456 ~1403 and 1236 Howcm-1/1038 cm-1 ever, the spectral absorption bands of malignant and benign samples in ~1044 cm-1/876 cm-1 and ~884 regions showed no significant differences.”
ATR-FTIR spectroscopy as adjunct method to the microscopic examination of hematoxylin and eosin-stained tissues in diagnosing lung cancer DOI: 10.1371/journal.pone.0233626 -
Acetate tillid 1,0
“Among 401 cm-1 them, the absorption at 1044 was mainly attributed to C-O stretching on C-O-C 402”
Beltramino 等 - 2016 - Optimization of sulfuric acid hydrolysis condition DOI: 10.1007/s10570-016-0897-y -
S eq o tillid 1,0
“The S=O stretching vibration of DMSO appears at 1044 cm-1 at 1044 and will therefore not overlap with any C=O vibrations of interest in the and will therefore not overlap with any C=O vibrations of interest in the analytes.”
The Effect of Sample Preparation Techniques on Lignin Fourier Transform Infrared Spectroscopy DOI: 10.3390/polym15132901
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