Hvad absorberer ved 970 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 970 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 970 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 11 | 10 | 1,0 |
| Alkyl C-H | 10 | 9 | 1,0 |
| Methacrylate | 9 | 8 | 1,0 |
| Acetate | 9 | 8 | 1,0 |
| Silicon (Si) | 8 | 8 | 1,0 |
| Silicon-oxygen (Si-O) | 8 | 6 | 1,0 |
| Silanol (Si-OH) | 7 | 6 | 1,0 |
| Methoxy (OCH3) | 7 | 6 | 1,0 |
| Alkene (C=C) | 6 | 5 | 1,0 |
| C-O single bond | 6 | 5 | 1,0 |
| Protein | 5 | 5 | 1,0 |
| Phosphate (PO4) | 5 | 5 | 1,0 |
| C c single bond | 5 | 4 | 1,0 |
| Phosphorus | 3 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Nucleic acid | 3 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Methyl | 2 | 2 | 1,0 |
| C-S single bond | 2 | 2 | 1,0 |
| Thiol | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 1 | 1,0 |
| Ring structure | 2 | 1 | 1,0 |
| Oxygen heterocycle | 2 | 0 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 0 | 1,0 |
| Silicon carbon | 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 |
|---|---|---|---|
| silica | 970, 1100, 1080 | Hydroxyl (O-H), Alkyl C-H, Methacrylate | 1 |
| DNA | 970, 1712, 1660 | Methacrylate, Acetate | 1 |
| cells | 970, 1741, 1020 | Alkyl C-H, 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 970 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
-
Silicon (Si) tillid 1,0
“The presence (SiO)n-, of siloxane groups, attached to the inorganic polymer 1000-1100cm-1 appears as an intense band in the region, with a 970cm-1, which was assigned to the Si O H bending shoulder at frequency.”
Dey 等 - 2008 - Mesoporous silica functionalized with diethylenetr DOI: 10.1016/j.colsurfa.2008.03.030 -
C c single bond tillid 1,0
“In addition, the peak at 970 is attributed to the deoxyribose C-C stretching mode, and it is often used as an internal reference for normalization to lyze the structural changes of dsDNA [34,46].”
Assessing B-Z DNA Transitions in Solutions via Infrared Spectroscopy DOI: 10.3390/biom13060964 -
tillid 1,0
“and symmetric vibration of Si-O-Si bonds at InfraUnmodified 10-15 nanosilica 970cm-1 red analysis of the nanosilica shows a peak around PFOA-modified 170-250 nanosilica”
Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260 -
Thiol tillid 1,0
“In Fig.1(a) , compared to the spectra of C-S-H, the spectra of C-A-S-H shows much stronger peaks at 970cm-1 cm-1, and 470 which indicates that bridging oxygen numbers and SiO tetrahedral about 4 chain length increases in C-A-S-H respectivel”
He 等 - 2011 - Morphology and Structure of Aluminum Substituted C DOI: 10.4028/www.scientific.net/AMR.287-290.1193 -
Acetate tillid 1,0
“Absent ≅ 2000 SiO2 overtone 2×1000 C=O stretching Medium Negative, Artefact ≅920+1037 1970 SiO2 combination band or 970+1000 [60] C=O stretching”
FTIR photoacoustic spectroscopy for identification and assessment of soil components_ Chernozems and their size fractions DOI: 10.1016/j.pacs.2020.100162 -
C c single bond tillid 1,0
“All the spectra examined consist of typical absorption peaks at about 3300 cm-l by (OH stretching), 3295 cm-' ( h C - H stretching), 2950 cm-l (C-H stretching), Downloaded 2255 cm-l (C%C-hC stretching), 2120 cm-l (C%C stretching), 1360-1300”
LANGER 和 MOSS - 1993 - FTIR STUDIES OF TRIMETHYLENE LINKED BIS-DIACETYLEN DOI: 10.1080/10587259308030157 -
Acetate tillid 1,0
“correlation with wavenumber values attributed to vibrations of (∼970cm-1), C-O DNA base-sugar bonds We have shown that FTIR spectroscopy is a sensitive technique furanose stretching cm-1) cm-1).”
A new approach to studying the effects of ionising radiation on single cells using FTIR synchrotron microspectroscopy DOI: 10.1016/j.radphyschem.2013.03.037 -
Silanol (Si-OH) tillid 1,0
“wavenumber range It is seen that the absorption That is, the absorption peaks at wavenumbers of 1434 and 1089cm(cid:1)1, peaks at wavenumbers of 970 and which are assigned 3452cm(cid:1)1 represent silanol groups (Wagner, 1976).”
Novel epoxidized natural rubber composites with geopolymers from fly ash waste DOI: 10.1016/j.wasman.2019.02.013
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