What absorbs at 1137 cm⁻¹ in an FTIR spectrum?
A band near 1137 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
Përgjigje e shpejtë
A band near 1137 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Caktime të mundshme të grupeve funksionale
| Grup funksional | Fakte mbështetëse | Burimet e cituara | Besueshmëri e lartë |
|---|---|---|---|
| Methoxy (OCH3) | 7 | 7 | 1,0 |
| Methacrylate | 7 | 7 | 1,0 |
| C-O single bond | 7 | 7 | 1,0 |
| Acetate | 7 | 7 | 1,0 |
| Phosphate (PO4) | 2 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
Renditja pasqyron provat e grumbulluara të literaturës, jo një rregull të vetëm autoritar. Gjithmonë konfirmoni në kontekstin e mostrës suaj.
Materialet e mundshme
| Material | Maja mbështetëse | Grupe të mbivendosura | Burimet e cituara |
|---|---|---|---|
| ZnO | 1137, 1400, 3430 | Acetate, Methacrylate, C-O single bond | 1 |
| polyurethane | 1137, 2270, 1700 | Methacrylate, Acetate, C-O single bond | 1 |
| polysaccharide | 1137, 1637, 1320 | Methacrylate, Acetate, C-O single bond | 1 |
| saliva | 1137, 1648, 1664 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Materialet shfaqen vetëm kur i njëjti grup literature mbështet këtë brez dhe të paktën një pik karakteristik shtesë.
Logjika e spektrit
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 1137 cm⁻¹ is usually not enough for material identification by itself.
Përdorimi në botën reale
Ky lloj pyetjeje është i zakonshëm në identifikimin e polimereve, skriningun e plastikës së panjohur, zgjidhjen e problemeve të kontrollit të cilësisë, verifikimin e materialeve të ricikluara dhe rishikimin e caktimit të pikut të mbështetur nga literatura.
Gabimet e zakonshme
- Trajtimi i një brezi të izoluar si provë e një materiali pa kontrolluar të paktën një ose dy pika mbështetëse.
- Duke injoruar mbivendosjen: grupe të shumta funksionale mund të kontribuojnë afër të njëjtit numër valor.
- Kalimi i vërtetimit kur aditivët, përzierjet, oksidimi ose ndotja mund të shtrembërojnë spektrin.
Këshillë për verifikim
Kur mbetet paqartësi, verifiko hipotezën me DSC, GC-MS ose TGA, veçanërisht për përzierjet, mostrat e degraduara dhe polimerët e mbushur.
Literatura pas këtyre caktimeve
-
Acetate besueshmëri 1,0
“S=O stretching 1230 S=O stretching Sargassum ilicifolium 1137 C-O stretching”
Artemisia 等 - 2019 - The Properties of Brown Marine Algae Sargassum tur DOI: 10.14499/indonesianjpharm30iss1pp43 -
Phosphate (PO4) besueshmëri 1,0
“3539.8 Weakly H bonded OH vibrations 3487.1 Weakly H bonded OH vibrations 3166.7 Weakly H bonded OH vibrations 1648.3 H-O-H Symmetric bending vibrations 1214.2 PO4 P=O associated stretching vibrations bond, P=O stretching vibrations 1136.7”
Growth and characterization of calcium hydrogen phosphate dihydrate crystals from single diffusion gel technique DOI: 10.1002/crat.200900700 -
Acetate besueshmëri 1,0
“The bands are observed at 1194 is exhibited at 1137cm-1 corresponding to the stretching vibration of and units) C-O bonds in primary alcohol [15, 16].”
Sanmugam 等 - 2017 - Optical and Structural Properties of Solvent Free DOI: 10.1155/2017/7536364 -
Carbohydrate besueshmëri 1,0
“The negative bands at 1137, cm-1 1078, 950, and 830 of PC1 could be due to the removal of high-MW carbohydrates and nucleic acids from the saliva and salivette samples after cut off or the removal of phosphorylated molecules.”
The Role of the Preanalytical Step for Human Saliva Analysis via Vibrational Spectroscopy DOI: 10.3390/metabo13030393 -
S eq o besueshmëri 1,0
“It was 1089.6cm-1 (S=O stretching vibration) and 1136.8, and”
Das 等 - 2011 - Solubility and dissolution enhancement of etoricox DOI: 10.5402/2011/819765 -
Silicon (Si) besueshmëri 1,0
“The weaker bands at 1137 1205cm-1 O bonds (E symmetry) lead to the intense band centred at and are assigned to Si-O stretching in the eight- ∼975cm-1 in Lz.”
Fritsch 等 - 2021 - Structural, textural, and chemical controls on the DOI: 10.5194/ejm-33-447-2021 -
C-O single bond besueshmëri 1,0
“Other a band at 1137 cm-1 corresponding to ν(C-O) vibrations, which further amplifies the inbands derived from TEGDMA, discussed in relation to the RelyX ARC resin, are also”
Influence of Dimethacrylate Monomer on the Polymerization Efficacy of Resin-Based Dental Cements—FTIR Analysis DOI: 10.3390/polym14020247 -
C-O single bond besueshmëri 1,0
“tion of the regions at 1250-1000 Figure 2 (b) presented characteristic ester carbonyl bands, assigned to ν(C=O) stretching at 1731 cm-1, peaks at 1234 cm-1 and 1137 cm-1 are assigned to ν(C-O) stretching, and the band at 1168 cm-1 is assign”
Nacas 等 - 2019 - Lithium catalyst concentration influence on bio-po DOI: 10.1590/S1517-707620190003.0716
Keni një spektër me këtë brez?
Ngarkoni spektrin tuaj FTIR dhe merrni një raport të plotë interpretimi — caktim i pikut me citime literaturë, përputhje biblioteke dhe një zinxhir provash të vlerësuar me besueshmëri — në sekonda.