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
Mabilis na sagot
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.
Mga posibleng pagtatalaga ng functional-group
| Grupong functional | Mga sumusuportang katotohanan | Mga nasiping sanggunian | Pinakamataas na kumpiyansa |
|---|---|---|---|
| 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 |
Ang pagraranggo ay sumasalamin sa naipon na ebidensya ng literatura, hindi isang solong awtoritatibong tuntunin. Palaging kumpirmahin laban sa konteksto ng iyong sample.
Mga posibleng materyales
| Materyal | Sumusuportang mga peak | Mga overlapping na grupo | Mga nasiping sanggunian |
|---|---|---|---|
| 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 |
Ang mga materyales ay ipinapakita lamang kapag ang parehong literatura pool ay sumusuporta sa banda na ito at hindi bababa sa isang karagdagang katangian na tuktok.
Logic ng spectrum
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.
Paggamit sa totoong mundo
Ang uri ng query na ito ay karaniwan sa pagtukoy ng polymer, screening ng hindi kilalang plastic, pag-troubleshoot ng QC, pag-verify ng recycled na materyal, at pagsusuri ng pagtatalaga ng peak na may suporta ng literatura.
Mga karaniwang pagkakamali
- Pagtrato sa isang nakahiwalay na banda bilang patunay ng isang materyal nang hindi sinusuri ang hindi bababa sa isa o dalawang sumusuportang peak.
- Hindi pinapansin ang overlap: maraming functional group ang maaaring mag-ambag malapit sa parehong wavenumber.
- Pag-laktaw sa pagpapatunay kapag ang mga additives, blends, oxidation, o contamination ay maaaring mag-distort ng spectrum.
Payo sa pagpapatunay
Kapag nananatili ang kalabuan, patunayan ang hypothesis gamit ang DSC, GC-MS, o TGA, lalo na para sa mga blend, degraded na sample, at filled polymers.
Literatura sa likod ng mga pagtatalagang ito
-
Acetate kumpiyansa 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) kumpiyansa 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 kumpiyansa 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 kumpiyansa 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 kumpiyansa 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) kumpiyansa 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 kumpiyansa 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 kumpiyansa 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
May spectrum ka ba na may ganitong band?
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