Hvad absorberer ved 1078 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1078 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 1078 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 | 25 | 1,0 |
| Methoxy (OCH3) | 23 | 23 | 1,0 |
| Methacrylate | 23 | 23 | 1,0 |
| Acetate | 23 | 23 | 1,0 |
| Hydroxyl (O-H) | 10 | 10 | 1,0 |
| Phosphate (PO4) | 9 | 8 | 1,0 |
| Silicon-oxygen (Si-O) | 7 | 5 | 1,0 |
| Carbohydrate | 6 | 6 | 1,0 |
| Amide | 5 | 5 | 1,0 |
| Alkyl C-H | 5 | 5 | 1,0 |
| Silicon (Si) | 4 | 4 | 1,0 |
| Siloxane (Si-O-Si) | 4 | 3 | 1,0 |
| Phosphorus | 3 | 3 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Thiocarbonyl | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Sulfate (SO4) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 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 |
|---|---|---|---|
| polysaccharide | 1078, 1637, 1320 | Methacrylate, Acetate, C-O single bond | 1 |
| CS | 1078, 1645, 1720 | Methacrylate, C-O single bond, Acetate | 1 |
| polysaccharides | 1078, 1053, 1143 | 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 1078 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
“719 (m) C-O-C stretching in esters 1078 (w) 1031;”
Barnaby 等 - 2018 - Free Radical Scavenging Capacity, Carotenoid Conte DOI: 10.1155/2018/1762342 -
tillid 1,0
“cm-1 bands near 1385, 1047, 1026 and 883 showed the presDetermination of prebiotic potential of PKC crude β-glycosidc ence of bonds while the bands around 1078 and soluble polysaccharides α-glycosidic 843 were assigned to bonds (Capek et al”
Evaluation of the effect of soluble polysaccharides of palm kernel cake as a potential prebiotic on the growth of probiotics DOI: 10.1007/s13205-018-1362-4 -
Amide tillid 1,0
“Including cm-1 cm-1 the peak corresponding to amide II, two peaks at 1448 and 1078 are similar to the peaks at 1446 and”
Analysis of the ex-vivo transformation of semen, saliva and urine as they dry out using ATR-FTIR spectroscopy and chemometric approach DOI: 10.1038/s41598-021-91009-5 -
Alkyl C-H tillid 1,0
“FTIR 1078cm-1 at 1337, 1230 and are assigned as CH bending, CH”
Spectroscopic characterization approach to study surfactants effect on ZnO2 nanoparticles synthesis by laser ablation process DOI: 10.1016/j.apsusc.2010.02.068 -
Phosphate (PO4) tillid 1,0
“LLM confirmed rule peak-group candidate”
Ghosh 等 - 2013 - Cinnamon Oil Nanoemulsion Formulation by Ultrasoni DOI: 10.1166/jnn.2013.6701 -
Acetate tillid 1,0
“12 Relation between FWHM and positions on RGO film (3 min, epoxy groups, the stretching vibration of C-O at 1078 and 6 W)”
Optical properties of graphene oxide thin film reduced by low-cost diode laser DOI: 10.1007/s00339-020-03710-3 -
C-O single bond tillid 1,0
“The FTIR spectroscopy study of neat PLA having various functional groups C=O al cm-1), cm-1), stretching vibrations (~ 1749 asymmetric C-O-C stretching (1180 symmetric and cm-1), cm-1), asymmetric -CH vibrations (1128 and 1042 C-OH side gro”
Ghosh 等 - 2020 - Blown films fabrication of poly lactic acid based DOI: 10.1016/j.mtcomm.2019.100737 -
Acetate tillid 1,0
“The position and cm(cid:1)1 bands, the peak at 1078 is due to the C-O focus of the sample were adjusted microscopically through stretching modes of glycoprotein in the FBG strucan Aperture Through Optical System (ATOS) for analysis.”
Pressure dependence of human fibrinogen correlated to the conformational [alpha]-helix to [beta]-sheet transition: An Fourier transform infrared study microspectroscopic study DOI: 10.1002/bip.20012
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