Hvad absorberer ved 1125 cm⁻¹ i et FTIR-spektrum?
Et bånd nær 1125 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 1125 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 | 7 | 7 | 1,0 |
| Methoxy (OCH3) | 6 | 6 | 1,0 |
| Methacrylate | 6 | 6 | 1,0 |
| Acetate | 6 | 6 | 1,0 |
| Phosphate (PO4) | 4 | 4 | 1,0 |
| Metal oxygen | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Nucleic acid | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Secondary amine | 3 | 2 | 1,0 |
| C n single bond | 3 | 2 | 1,0 |
| Amide | 3 | 2 | 1,0 |
| Carbohydrate | 2 | 2 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 0,9 |
| Methyl | 1 | 1 | 0,8 |
| C=n | 1 | 0 | 0,9 |
Rangering afspejler akkumuleret litteraturevidence, ikke en enkelt fast regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| saliva | 1125, 1648, 1664 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| lignin | 1125, 1035, 1510 | 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 1125 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
-
Nucleic acid tillid 1,0
“The analysis in Figure 3a,b shows that in the transformation from B-DNA to Z-DNA, cm-1 cm-1 the characteristic peaks at ~1125 and ~925 appeared, which are attributed to cm-1 Z-DNA.”
Assessing B-Z DNA Transitions in Solutions via Infrared Spectroscopy DOI: 10.3390/biom13060964 -
Alkyl C-H tillid 1,0
“cm-1 C-O 1214-1221 [6, 27] G2 1213 x x x x x (x) x stretch of guaiacyl ring: cm-1 C-H 1140-1145 [6, 27, 28] G3 1151 x x x (x) Possibly stretch of guaiacyl ring: cm-1 C-H [6] G4 1124 x x x (x) x (x) Aromatic deformation of guaiacyl ring: 112”
Characterisation of Authentic Lignin Biorefinery Samples by Fourier Transform Infrared Spectroscopy and Determination of the Chemical Formula for Lignin DOI: 10.1007/s12155-017-9861-4 -
tillid 1,0
“The previous discusfilms were treated by H this peak to each vibration, we assign the peak at 1125 sion suggests that the thickness difference in the SiO 2 cm-1 Si-O as the combined contribution of the vibration of layer (cf.”
Lu 和 Mi - 2005 - Characterization of the interfacial interaction be DOI: 10.1021/ma0486896 -
Amide tillid 1,0
“cm(cid:0) cm(cid:0) 1 1 After the attachment of polyaniline a band at 1288 After chromium adsorption in the case of PANIDSC@Cr three peaks and 1125 25◦, 28.2◦, 40.4◦ = 2θ C-N were observed at in the case of PANIDSC, PANIDSC@Cr is the charac”
Efficient removal of Cr(VI) by polyaniline modified biochar from date (Phoenix dactylifera) seed DOI: 10.1016/j.gsd.2021.100653 -
Phosphate (PO4) tillid 1,0
“The peak at 1125 can be assigned to either the stretching 3 3-2 vibration of P-O-Si (25), asymmetric vibration of PO (42, 46) or an overlap of both peaks.”
Al-Sallami 等 - 2019 - Reactivity of oil-soluble IL with silicon surface DOI: 10.1002/ls.1456 -
Acetate tillid 1,0
“The C-O stretch cm-1 absorption peak at 1125 for NMA expressed a similar trend to shift to lower wavenumbers for both 2ET and DGME, indicating that new X-Y interactions were formed [25].”
The development of powder injection moulding binders: A quantification of individual components' interactions DOI: 10.1016/j.powtec.2015.07.046 -
Acetate tillid 1,0
“phosphodiester groups from phosphorylated molecules (1125 and 1076 and C-O stretching vibration coupled with C-O bending of the C-OH groups of carbohydrates cm-1.”
The Role of the Preanalytical Step for Human Saliva Analysis via Vibrational Spectroscopy DOI: 10.3390/metabo13030393 -
Nucleic acid tillid 1,0
“cm-1) cm-1 (±7 RNA-specific infrared absorptions at 1125 and 984 [43] are particular peaks considered diagnostic of the contribution of RNA in the nucleic acid backbone vibrations [43-45].”
Synchrotron-Based Fourier-Transform Infrared Micro- Spectroscopy of Cerebrospinal Fluid from Amyotrophic Lateral Sclerosis Patients Reveals a Unique Biomolecular Profile DOI: 10.3390/cells12111451
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