Hvad absorberer ved 1336 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1336 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 1336 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 | 6 | 6 | 1,0 |
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Nitrile | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Protein | 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 |
|---|---|---|---|
| Chitosan | 1336, 1650, 1655 | Alkyl C-H, Amide, Hydroxyl (O-H) | 1 |
| starch | 1336, 1650, 1540 | Hydroxyl (O-H), Alkyl C-H, Amide | 1 |
| Nanocellulose | 1336, 1540, 1646 | Alkyl C-H, Amide, Hydroxyl (O-H) | 1 |
| CMC | 1336, 1423, 1196 | Hydroxyl (O-H), Alkyl C-H, Amide | 1 |
| rGO | 1336, 2358, 2930 | Hydroxyl (O-H), Alkyl C-H, Amide | 1 |
| Fe3O4 | 1336, 2358, 1673 | Hydroxyl (O-H), Alkyl C-H, Amide | 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 1336 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
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Alkyl C-H tillid 1,0
“The HWS spectrums displayed CH twisting at 2 1336cm-1 cm-1 and CWS samples spectrum were shifted to higher ones at 1357-1367 indicating cm-1 RIPT C-H symmetric bending of CH in CWS spectrums.”
Butt 等 - 2019 - Rice starch citrates and lactates A comparative s DOI: 10.1016/j.ijbiomac.2019.01.019 -
tillid 1,0
“1g Journal cm-1 cm-1that sharp peaks appeared at1600.89 and 1335.87 corresponds to G-band and D-band respectively for 5mM Fe 3O 4/rGO nanocomposite [33].”
Devi 等 - 2020 - Investigation of chemical bonding and supercapacit DOI: 10.1016/j.diamond.2020.107756 -
Amide tillid 1,0
“An explanation of these changes when AZA reacts with ST-namely (i) the downshift of the explanation of these changes when AZA reacts with ST-namely (i) the downshift of the IR band of AZA from 1336 cm-1 to 1331 cm-1, the band attributed to”
Photodegradation of Azathioprine in the Presence of Sodium Thiosulfate DOI: 10.3390/ijms23073975 -
Alkyl C-H tillid 1,0
“2 1376 C-H deformation vibrational Cellulose 1336 O-H in-plain deformation”
Micro-FTIR combined with curve fitting method to study cellulose crystallinity of developing cotton fibers DOI: 10.1007/s00216-020-03094-6 -
S eq o tillid 1,0
“In the spectra of complexes (II) and (III), the unbound sulfonyl group was described by two νas(SO2) bands, which were located at 1356 cm-1 and 1336 cm-1 for (II), and at 1347 cm-1 and 1334 cm-1 for (III).”
Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-BasedIonic Liquid DOI: 10.3390/molecules28030935 -
Amide tillid 1,0
“The literature states that the imine group's (CH=N) characteristic absorption cm-1) band (1660-1630 cannot be observed clearly, probably because it overlaps with the spectrum was shifted at 1336 cm-1 and split into many other lower intensit”
Hydrogel Films Based on Chitosan and Oxidized Carboxymethylcellulose Optimized for the Controlled Release of Curcumin with Applications in Treating Dermatological Conditions DOI: 10.3390/molecules26082185 -
Alkyl C-H tillid 1,0
“A significant increase of the absorption band transmittance at 1426 cm-1 assigned to the C-H cm-1 A significant increase of the absorption band transmittance at 1426 assigned to the C-H bending [64] and of the absorption band at 1371 cm-1 a”
Bacterial Nanocellulose from Side-Streams of Kombucha Beverages Production: Preparation and Physical-Chemical Properties DOI: 10.3390/polym9080374 -
Hydroxyl (O-H) tillid 1,0
“The wide band at 3441 represents the cm-1 cm-1 cm-1, around 1336 O-H stretching vibration.”
Hamisu 和 Celik - 2017 - Poly(AN-co-PEGMA)hBNNaClO4 composite electrolyte DOI: 10.1515/epoly-2017-0022
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