Hvad absorberer ved 1425 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1425 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 1425 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 | 26 | 24 | 1,0 |
| Carbohydrate | 10 | 8 | 1,0 |
| Methacrylate | 9 | 9 | 1,0 |
| Acetate | 9 | 9 | 1,0 |
| Methoxy (OCH3) | 8 | 8 | 1,0 |
| Aromatic ring | 7 | 7 | 1,0 |
| Amide | 7 | 7 | 1,0 |
| Carboxyl (COOH) | 6 | 6 | 1,0 |
| C-O single bond | 6 | 6 | 1,0 |
| Ketone | 5 | 5 | 1,0 |
| Lignin | 5 | 4 | 1,0 |
| Hydroxyl (O-H) | 5 | 4 | 1,0 |
| Ester | 4 | 4 | 1,0 |
| Carbonyl (C=O) | 4 | 4 | 1,0 |
| Carbonate | 3 | 3 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Nitrogen heterocycle | 2 | 1 | 1,0 |
| Hydrogen bond | 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 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Bronsted acid site | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 0,9 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| lignin | 1425, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 2 |
| cellulose | 1425, 1735, 1650 | Alkyl C-H, Acetate, Methacrylate | 1 |
| hemicellulose | 1425, 1730, 897 | Alkyl C-H, Methacrylate, Acetate | 1 |
| nanocellulose | 1425, 1540, 1646 | Alkyl C-H, Methacrylate, Acetate | 1 |
| wood | 1425, 1740, 1730 | Carbohydrate, Alkyl C-H, Methacrylate | 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 1425 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
“1450and1400cm(cid:2)1(Guilianoetal.,2000).Thescissoringstrongpeakat cm(cid:2)1 was attributed to the cellulose I, while cellulose II and 1430 amorphous cellulose were characterized by weak peak detected at 1420 cm(cid:2)1(Songetal.,2015).On”
Structural characterization of Argania spinosa Moroccan wooden artifacts during natural degradation progress using infrared spectroscopy (ATR-FTIR) and X-Ray diffraction (XRD) DOI: 10.1016/j.heliyon.2019.e02477 -
Acetate tillid 1,0
“1112 C-C, C-O stretching in holocellulose 1425 1426 Aromatic skeletal vibration in lignin and C-H deformation in-plane deforming 1058”
Jin 等 - 2022 - Rapid Identification for the Pterocarpus Bracelet DOI: 10.3390/molecules27154793 -
Alkyl C-H tillid 1,0
“At the same cm1 time, in the region of 1425 related to bending vibrations of -CH 2groups, the signal intensity cm1 decreases, and the intensity of the absorption band at 1315 related to fan-shaped vibrations of - CH 2groups, which are assoc”
Makhliyo 等 - 2023 - Preparation of oxidized nanocellulose by using pot DOI: 10.21203/rs.3.rs-2033622/v1 -
Alkyl C-H tillid 1,0
“Peak at 1425 attributed to vibration of CH group, 2 membrane were estimated using Rabek's method using following”
Fabrication and characterization of modified microcrystalline cellulose membrane as proton exchange membrane for direct methanol fuel cell DOI: 10.1016/j.matpr.2021.01.431 -
Carbohydrate tillid 1,0
“We have calculated the ratios of the cm-1 cm-1 (1505 heights of lignin peaks at 1505/1511 against peaks at 1462 (for beech) and 1511 bands (for pine) cm-1 and 1425 against carbohydrate bands) although high weight losses (due to C-H, deforma”
Pandey 和 Pitman - 2003 - FTIR studies of the changes in wood chemistry foll DOI: 10.1016/S0964-8305(03)00052-0 -
Alkyl C-H tillid 1,0
“More pronounced bands at 1425 (8), 1323 (10), 1105 (14), 1054 (15), and 897 (17) cm-1 which represent stretching vibration of -CH shear, C-H, C-O of secondary alcohol, C-C, and β2 glyosidic linkage in cellulose were clearly discernible, imp”
Solihat 等 - 2020 - Microwave assisted dilute organic acid pre-treatme DOI: 10.1088/1757-899X/935/1/012046 -
Carbonate tillid 1,0
“a sharp peak at 1425 and attributed to carbonates and the decomposition of readily degradable organic matter, such (carbonates: C-O stretch vibration and C-O out of plane vibration, as aliphatic components, polysaccharides, and alcohols.”
Evaluation of the biological stability of waste during landfill stabilization by thermogravimetric analysis and Fourier transform infrared spectroscopy DOI: 10.1016/j.biortech.2011.07.029 -
tillid 1,0
“stretching and aromatic skeletal vibration were important oxygen but is more likely to be an interaction band between 1425cm-1 carbon single bonded oxygen stretch and in-plane carbon , respectively loadings at 1735, 1658, 1328, 1510, and Jo”
Zhou 等 - 2015 - Multivariate Calibration and Model Integrity for W DOI: 10.1155/2015/429846
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