Hvad absorberer ved 1242 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1242 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 1242 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 |
|---|---|---|---|
| Amide | 19 | 18 | 1,0 |
| Methacrylate | 18 | 16 | 1,0 |
| Acetate | 18 | 16 | 1,0 |
| C-O single bond | 18 | 16 | 1,0 |
| Methoxy (OCH3) | 15 | 13 | 1,0 |
| C n single bond | 8 | 8 | 1,0 |
| Alkyl C-H | 8 | 8 | 1,0 |
| Ester | 7 | 7 | 1,0 |
| Secondary amine | 7 | 7 | 1,0 |
| Carboxyl (COOH) | 6 | 6 | 1,0 |
| Nucleic acid | 4 | 4 | 1,0 |
| Phosphate (PO4) | 3 | 3 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Carbohydrate | 3 | 3 | 1,0 |
| Fluorine (C-F) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Lignin | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Protein random coil | 1 | 1 | 1,0 |
| Protein beta sheet | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| Acetyl | 1 | 1 | 1,0 |
| N h | 1 | 1 | 0,95 |
| Alkene (C=C) | 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 |
|---|---|---|---|
| Cellulose | 1242, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| graphene oxide | 1242, 1150, 3400 | Methacrylate, Acetate, C-O single bond | 1 |
| asphalt binder | 1242, 1700, 1375 | Methacrylate, Acetate | 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 1242 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
“Figure 1 shows a schematic of a dielectric barman spectroscopy and mentioned that the absorption 1242cm-1 rier discharge (DBD) device which has been used to band at was attributed to the CH 2OH regenerate plasma throughout these experiments”
Characterization of Modified Tapioca Starch in Atmospheric Argon Plasma under Diverse Humidity by FTIR Spectroscopy DOI: 10.1088/0256-307X/30/1/018103 -
Acetyl tillid 1,0
“cm-1 The peak at 1242 of raw spectrum was EFB The moisture content (2-5%) seems to be necessary for attributed to a waxy acetyl group of hemicellulose ester the best reaction.”
Jahi 等 - 2020 - Empty Fruit Bunch Cellulose based Sorbent for Oil DOI: 10.17576/jsm-2020-4909-29 -
Acetate tillid 1,0
“This evidence is further supported by a strong band in 1050cm(cid:1)1 cm(cid:1)1 1250 region responsible for C-O absorption (1242.00 cm(cid:1)1).”
Green synthesis and biological evaluation of novel 5-fluorouracil derivatives as potent anticancer agents DOI: 10.1016/j.jsps.2019.09.013 -
Alkyl C-H tillid 1,0
“Similar to previous studies, SBS showed studies, SBS showed absorption reactions in the C=C bond and the C-H bond, with peaks absorption reactions in the C=C bond and the C-H bond, with peaks in the 700, 910, 966, cm-1 cm-1 cm(cid:2879)(cid”
Analysis of the Properties of Modified Asphalt Binder by FTIR Method DOI: 10.3390/ma15165743 -
Nitrate tillid 1,0
“monodentate nitrate species, indicated by split peaks at 1242 The lack of distinct features at 323 K for wavenumbers cm-1, cm-1 and 1295 shifted to lower wavenumbers and remained below 1500 makes it difficult to identify the individual”
Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122 -
Acetate tillid 1,0
“As for the bands at 1242 and cm-1, 1186 they refer to the stretching of C-O-C bands of epoxy, but mostly in the phenolic groups cm-1 present in the ramie fiber constituents [41].”
Pereira 等 - 2020 - Ballistic Performance of Ramie Fabric Reinforcing DOI: 10.3390/polym12112711 -
Acetate tillid 1,0
“The absorption peak at 1242 is because particle size of the Silica sol/MG resin composite modifier of the stretching of the C-O-C bond of the ether.”
Qin 等 - 2023 - Preparation and properties of silica solmelamine DOI: 10.1080/15685551.2022.2162280 -
Amide tillid 1,0
“The band at is assigned to C-N stretching mode of 1242cm-1 benzenoid ring.”
Rajakani 和 Vedhi - 2013 - Synthesis and electrochemical studies of TiO2 - Pa DOI: 10.4028/www.scientific.net/AMR.678.263
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