Hvad absorberer ved 1320 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1320 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 1320 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 | 25 | 24 | 1,0 |
| Acetate | 23 | 23 | 1,0 |
| Methacrylate | 22 | 22 | 1,0 |
| Methoxy (OCH3) | 21 | 21 | 1,0 |
| Amide | 17 | 17 | 1,0 |
| Alkyl C-H | 7 | 7 | 1,0 |
| Carbohydrate | 7 | 7 | 1,0 |
| Hydroxyl (O-H) | 7 | 6 | 1,0 |
| Aromatic ring | 6 | 6 | 1,0 |
| Secondary amine | 5 | 5 | 1,0 |
| C n single bond | 5 | 5 | 1,0 |
| Ring structure | 4 | 4 | 1,0 |
| Ester | 4 | 4 | 1,0 |
| Lignin | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Phosphate (PO4) | 3 | 1 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Acetyl | 2 | 2 | 1,0 |
| Protein alpha helix | 2 | 2 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 0,9 |
| Nitrate | 1 | 1 | 0,9 |
| Sulfur heterocycle | 1 | 1 | 0,8 |
| Phosphorus | 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 |
|---|---|---|---|
| chitosan | 1320, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| polysaccharide | 1320, 1637, 1064 | 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 1320 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
-
Carbohydrate tillid 1,0
“Fourier transform infrared (FTIR) peak at 1507 confirmed the presence of lignin and the cm-1 appearance of three new peaks at 1320, 1416, and 1595 showed successful attachment of carboxymethyl group onto the cellulose backbone.”
Cellulose-based polymer electrolyte derived from waste coconut husk: residual lignin as a natural plasticizer DOI: 10.1007/s10965-020-02110-8 -
Nucleic acid tillid 1,0
“It was found that with the increase of NaCl, MgCl 2, or ethanol concentration in the incm-1, cm-1, cm-1 duction solution, the characteristic Z-DNA peaks of 1320 1125 and 925 in the infrared spectra changed during the B-Z DNA transition, and”
Assessing B-Z DNA Transitions in Solutions via Infrared Spectroscopy DOI: 10.3390/biom13060964 -
Amide tillid 1,0
“cm(cid:1)1 The peak in 1320 correspond to the characteristic band of subjected, because each DTG peak, at any temperature gives the rate of amide group (-OH, -NH2, -CO).”
A comparison of chitosan properties after extraction from shrimp shells by diluted and concentrated acids DOI: 10.1016/j.heliyon.2020.e03486 -
tillid 1,0
“Band intensity of the formate species with a symmetric O-C-O vibration around Adsorbed CO 1320cm(cid:2)1 remains unchanged with increase of methanol concentration from 0.04M to 1M, while the Formate 4.Theresultsuggestsaminor peakcurrentofme”
Kunimatsu 等 - 2009 - Role of adsorbed species in methanol oxidation on DOI: 10.1016/j.jelechem.2009.04.004 -
Acetate tillid 1,0
“The The band band at at about about 1320 1320 cm1 cm1 has has been been assigned assigned to to C-O-H C-O-H bending bending and and CH2 CH2 deformation deformation 14 14 Itcan Itcan be be concluded concluded that that bands in the region 1”
Liu 等 - 2006 - Characterization of the basidiomycetes Thelephora DOI: 10.1117/12.710905 -
Acetate tillid 1,0
“and C-O stretching is seen at 1320”
Synthesis of Aloevera/Acrylonitrile based Nanoparticles for targeted drug delivery of 5-Aminosalicylic acid DOI: 10.1016/j.ijbiomac.2017.08.085 -
Protein alpha helix tillid 1,0
“The position of α-helix in Amide III region is assigned to 1320 cm-1 cm-1 while a turn is recognized at about 1270-1285 (between 1260-1280 in literature [24]).”
Milosevic 等 - 2020 - Exploring the potential of infrared spectroscopy i DOI: 10.1016/j.saa.2019.117882 -
Protein alpha helix tillid 1,0
“cmK1 cmK1 Surprisingly, the Amide 111 band at 1320 showing that egg albumen was showed structure at 960 a-helix substantially denatured (Howell & Li-Chan, 1996), whilst significant but lower values in in high pressure0.27G0.02 no peaks were”
Ngarize 等 - 2005 - A comparative study of heat and high pressure indu DOI: 10.1016/j.foodhyd.2004.12.008
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