Hvad absorberer ved 700 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 700 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 700 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 |
|---|---|---|---|
| Metal oxygen | 23 | 22 | 1,0 |
| Alkyl C-H | 20 | 19 | 1,0 |
| Hydroxyl (O-H) | 12 | 12 | 1,0 |
| Aromatic ring | 11 | 11 | 1,0 |
| Silicon-oxygen (Si-O) | 9 | 9 | 1,0 |
| Amide | 7 | 7 | 1,0 |
| Alkene (C=C) | 7 | 7 | 1,0 |
| Carbonyl (C=O) | 6 | 6 | 1,0 |
| Siloxane (Si-O-Si) | 6 | 6 | 1,0 |
| C-O single bond | 5 | 5 | 1,0 |
| C c single bond | 5 | 5 | 1,0 |
| Methacrylate | 5 | 5 | 1,0 |
| Acetate | 5 | 5 | 1,0 |
| Carbonate | 4 | 4 | 1,0 |
| Silicon (Si) | 4 | 4 | 1,0 |
| Borate | 4 | 3 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| Ring structure | 3 | 3 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Ester | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Phosphate (PO4) | 3 | 2 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 2 | 2 | 1,0 |
| Hydrogen bond | 2 | 2 | 1,0 |
| Sulfate (SO4) | 2 | 1 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| Azide | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Styrene | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Imide | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Silicon nitrogen | 1 | 1 | 1,0 |
| Metalloid oxygen | 1 | 1 | 0,85 |
| 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 |
|---|---|---|---|
| PEG | 700, 1650, 1342 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| Cellulose | 700, 1735, 1650 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| Fe3O4 | 700, 2358, 1673 | Hydroxyl (O-H), Metal oxygen, Alkyl C-H | 1 |
| silver nanoparticles | 700, 1636, 1631 | Hydroxyl (O-H), Alkyl C-H | 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 700 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
-
Hydroxyl (O-H) tillid 1,0
“For modified acetone, toluene, DMF and THF samples, the chemical decomposition peak is extended to ~700°C, which can be due to either higheramountofchemicalgraftingordehydroxylationoftheunreacted confirmed modified hydroxyl groups.”
Silane functionalization of sodium montmorillonite nanoclay_ The effect of dispersing media on intercalation and chemical grafting DOI: 10.1016/j.clay.2017.12.020 -
Acetate tillid 1,0
“Additionally, peaks at 700.25, 666.92 and cm1 1075.51, 1039.62 indicate C-O stretch of the alcohol and ether group, respectively, while the vibration at cm-1 C≡C 2076.29 and 2069.54 demonstrates stretch of alkynes.”
Antibacterial efficacy of synthesized silver nanoparticles of Microbacterium proteolyticum LA2(R) and Streptomyces rochei LA2(O) against biofilm forming meningitis causing microbes DOI: 10.1038/s41598-023-30215-9 -
Hydroxyl (O-H) tillid 1,0
“cm-1 Deconvolution of the Peak between 1750-1550 According to literature [35], moisture causes the occurrence of multiple peaks at following cm-1 wavenumbers: 700 (out-of-plane vibrations of O-H groups or rotational vibrations of the whole”
IR Study on Cellulose with the Varied Moisture Contents: Insight into the Supramolecular Structure DOI: 10.3390/ma13204573 -
Alkyl C-H tillid 1,0
“1″-H 2′, 2″-H) confirming C-H and 2, are giving cross peaks that there is The peaks at 1002, 966, 909 and are due to wagging of 1′, 1″-H 2′, 2″-H C-H C-H magnetization transfer between 1, and 2, through the vinyl, wagging of trans, CH waggi”
Reactive grafting of 3-octanoylthio-1-propyltriethoxysilane in styrene butadiene rubber_ Characterization and its effect on silica reinforced tire composites DOI: 10.1016/j.polymer.2019.121693 -
tillid 1,0
“In addition, the presence of a small peak around 700 can be Polymers2023,15,971 11of21 α-ferric attributed to the decomposition of Fe 3O to other compounds such as oxide [54].”
Formulation and Characterization of Fe3O4@PEG Nanoparticles Loaded Sorafenib; Molecular Studies and Evaluation of Cytotoxicity in Liver Cancer Cell Lines DOI: 10.3390/polym15040971 -
Ring structure tillid 1,0
“IntheIberiansamplethecharacteristicsignalsofthearomatic 1606cm-1, rings, especially those of symmetric ring stretch 700cm-1) although out-of-plane ring bend loop (822, 755 and are even stronger probably due to the higher level of dehydroFig”
Font 等 - 2007 - Fourier transform infrared spectroscopy as a suita DOI: 10.1016/j.aca.2007.07.021 -
Silicon nitrogen tillid 1,0
“absorption band between 700 SiON films with low oxygen incorporation have a peak wavenumber of the Si-N/Si-O absorption band similar to that of SiN, and this region of the absorption spectrum is heavily dominated”
Effect of PECVD silicon oxynitride film composition on the surface passivation of silicon wafers DOI: 10.1016/j.solmat.2011.09.052 -
Borate tillid 1,0
“The sharp band at 700 was assigned to 6 the bending vibrations of B-O-B units in BO triangles [26].”
Red light Emission from Europium doped Zinc Sodium Bismuth Borate Glasses DOI: 10.1016/j.physb.2017.09.113
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