Hvad absorberer ved 1651 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1651 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 1651 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 | 39 | 36 | 1,0 |
| Carbonyl (C=O) | 20 | 18 | 1,0 |
| Methacrylate | 16 | 15 | 1,0 |
| Acetate | 16 | 15 | 1,0 |
| Carboxyl (COOH) | 16 | 13 | 1,0 |
| Ketone | 13 | 12 | 1,0 |
| Ester | 12 | 11 | 1,0 |
| Alkene (C=C) | 10 | 10 | 1,0 |
| Alkyl C-H | 10 | 10 | 1,0 |
| N h | 6 | 6 | 1,0 |
| Hydroxyl (O-H) | 6 | 6 | 1,0 |
| Protein alpha helix | 6 | 5 | 1,0 |
| Water (H2O) | 5 | 4 | 1,0 |
| Aromatic ring | 4 | 4 | 1,0 |
| Secondary amine | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Ring structure | 2 | 2 | 1,0 |
| Protein | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| N-O bond | 2 | 2 | 1,0 |
| Amine primary | 2 | 2 | 1,0 |
| S eq o | 2 | 2 | 1,0 |
| Protein random coil | 2 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Protein beta sheet | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Amino acid | 1 | 1 | 0,8 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| chitosan | 1651, 1650, 1655 | Amide, Acetate, 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 1651 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
-
Amide tillid 1,0
“In general, chitosan powder show characteristic peaks at 3425.58 cm-1 cm-1 cm-1 (-OH and -NH stretching), 2877.79 (-CH stretching), 1651.07 (amide I/C=O stretching), 2 cm-1 cm-1 cm-1 1597.06 (amide II/-NH bending), 1072.42 (C-O-C stretching”
Cahyono 等 - 2018 - Characteristics of eugenol loaded chitosan-tripoly DOI: 10.1088/1757-899X/349/1/012010 -
Water (H2O) tillid 1,0
“The thermal-dependent FT-IR spectra for raffinose cmK1 8C, was reduced gradually with temperature up to 50 decreased significantly above pentahydrate revealed that the peak intensity at 1651 cmK1 cmK1 8C 8C, 8C, was shifted to 1639 from 48”
Cheng 和 Lin - 2006 - Processes of dehydration and rehydration of raffin DOI: 10.1016/j.carbpol.2005.11.024 -
Carbohydrate tillid 1,0
“Table 2: Experimental results of the absorbance measurements of the 1651 and 1593 cm-1 peaks after normalization to the cellulose peak.”
FTIR as an easy and fast analytical approach to follow up microbial growth during fungal pretreatment of poplar wood with Phanerochaete chrysosporium DOI: 10.1016/J.MIMET.2018.01.004 -
Amide tillid 1,0
“pling (amide I and amide II bands at 1651 and 1590 [17] J.E.Guillet,PureAppl.Chem.63(7)(1991)917.”
Ferreira 等 - 2013 - Surface modification of poly(dimethylsiloxane) by DOI: 10.1016/j.surfcoat.2013.02.035 -
Sulfonyl tillid 1,0
“Meanwhile, the presence of the peak at the 1651 cm-1, were assigned asymmetric O=S=O sulfonic group in SPEEK was confirmed by the sharp peak at 1024.13 cm-1, which were stretching vibration.”
Hasbullah 等 - 2016 - Synthesis and Characterizations of Electrospun Sul DOI: 10.1063/1.4948867 -
Acetate tillid 1,0
“NH3+ 1520 1520 1520 1520 [54] Overall, it can be observed that the response of the AS peak height 1644 1629 C--O Amide (stretch) 1651 1692 [53] 1685 1640”
Probing the interaction of glutathione with different shape of silver-nanoparticles by optical spectroscopy DOI: 10.1016/j.mtcomm.2021.102137 -
Amide tillid 1,0
“Fourier transform-infrared spectroscopy (FTIR) analysis was used to determine the change in important, organic functional groups and highlighted cm-1 the disappearance of a peak at 1530 corresponding to the primary protein (C-N) and the app”
Khoironi 等 - 2023 - Impact of disposable mask microplastics pollution DOI: 10.1007/s11356-023-27651-5 -
Acetate tillid 1,0
“Generally, the absorption peak at 1220 peakat1651cm-1 can be attributed to stretching of the C-O bond in phenol.”
Enzymatic Browning in Wheat Kernels Produces Symptom of Black Point Caused by Bipolaris sorokiniana DOI: 10.3389/fmicb.2020.526266
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