What absorbs at 1144 cm⁻¹ in an FTIR spectrum?
A band near 1144 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 1144 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) | 6 | 4 | 1.0 |
| Methacrylate | 6 | 4 | 1.0 |
| C-O single bond | 6 | 4 | 1.0 |
| Acetate | 6 | 4 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 0 | 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 |
|---|---|---|---|
| polyethylene | 1144, 1737, 1720 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polystyrene | 1144, 1020, 1600 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polysaccharide | 1144, 1637, 1320 | Methacrylate, Acetate, C-O single bond | 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 1144 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
“The band at cm-1 1144 resulted from the stretching vibrations of -C-O ester groups (Guillén & Cabo, cm-1 2000).”
Prediction of peroxide value in omega-3 rich microalgae oil by ATR-FTIR spectroscopy combined with chemometrics DOI: 10.1016/j.foodchem.2017.01.013 -
Hydrogen bond kumpiyansa 1.0
“The Hydrogen bond formation is predicted to be with the hydroxyl -1 peak at 1144 cm is ascribed to oxygen and sulfur double bond of amine groups.”
A case study of poly (aryl ether sulfone) hemodialysis membrane interactions with human blood: Molecular dynamics simulation and experimental analyses DOI: 10.1016/j.cmpb.2020.105742 -
Alkyl C-H kumpiyansa 1.0
“Stretching 1144 1012 1050 1039 H-C-H deformation”
Suardy 等 - 2020 - Analysis and Characterization of Microplastic from DOI: 10.17576/jsm-2020-4909-21 -
Acetate kumpiyansa 1.0
“For both paints, the contribution at 1144 and 1111 cm-1 attributed to C-O stretching disappears.”
Evaluation of the Impacts of Four Weathering Methods on Two Acrylic Paints: Showcasing Distinctions and Particularities DOI: 10.3390/coatings9020121 -
Acetate kumpiyansa 1.0
“the peak at 1143.57 could be assigned to triterpene compounds (C-O);”
Ganoderma lucidum-Mediated Green Synthesis of Silver Nanoparticles with Antimicrobial Activity DOI: 10.3390/ma16124261 -
kumpiyansa 1.0
“The very cm-1 wavenumbers correspond to C-F stretching vibrations of the PTFE strong absorption bands near 1144 and 1204 cm-1 are assigned to the symmetric vibrations of two ether backbone in Nafion.”
Irmawati 等 - 2016 - Polarization Losses Under Dynamic Load Cycle Using DOI: 10.1063/1.4941635 -
kumpiyansa 1.0
“The peak at 177 cm-1 is with the highest intensity are 101, 177, 1144, 1456, and 2923 attributed to Zn-N bond vibrations, the peak at 682 cm-1 is attributed to imidazolate ring puckering vibrations, the peak at 1144 cm-1 is attributed to Zn”
Biocatalysts Synthesized with Lipase from Pseudomonas cepacia on Glycol-Modified ZIF-8: Characterization and Utilization in the Synthesis of Green Biodiesel DOI: 10.3390/molecules27175396 -
Acetate kumpiyansa 1.0
“The signals at 1243 and 1144 cm-1 were assigned to the C-O-H”
Mucilage from Yellow Pitahaya (Selenicereus megalanthus)Fruit Peel: Extraction, Proximal Analysis, and Molecular Characterization DOI: 10.3390/molecules28020786
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