What absorbs at 1752 cm⁻¹ in an FTIR spectrum?
A band near 1752 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
Brzi odgovor
A band near 1752 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.
Moguće dodjele funkcionalnih skupina
| Funkcionalna skupina | Potporni dokazi | Citirani izvori | Najveća pouzdanost |
|---|---|---|---|
| Carbonyl (C=O) | 6 | 5 | 1,0 |
| Methacrylate | 4 | 3 | 1,0 |
| Ketone | 4 | 3 | 1,0 |
| Ester | 4 | 3 | 1,0 |
| Carboxyl (COOH) | 4 | 3 | 1,0 |
| Amide | 4 | 3 | 1,0 |
| Acetate | 4 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
Mogući materijali
| Materijal | Potporni vrhovi | Preklapajuće skupine | Citirani izvori |
|---|---|---|---|
| PEG | 1752, 1650, 1342 | Methacrylate, Carbonyl (C=O), Ester | 1 |
| chitosan | 1752, 1650, 1655 | Methacrylate | 1 |
| PLGA | 1752, 3200, 1741 | Carbonyl (C=O), Methacrylate | 1 |
| asphalt | 1752, 1600, 1376 | Methacrylate, Carbonyl (C=O) | 1 |
Materijali su prikazani samo kada ista literatura podržava ovu traku i barem jedan dodatni karakteristični vrh.
Logika spektra
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 1752 cm⁻¹ is usually not enough for material identification by itself.
Upotreba u stvarnom svijetu
Ova vrsta upita uobičajena je u identifikaciji polimera, probiru nepoznate plastike, rješavanju problema u kontroli kvalitete, provjeri recikliranog materijala i pregledu dodjele vrhova potkrijepljenom literaturom.
Uobičajene pogreške
- Tretiranje jedne izolirane vrpce kao dokaza materijala bez provjere barem jednog ili dva podržavajuća pika.
- Zanemarivanje preklapanja: više funkcionalnih skupina može doprinositi u blizini istog valnog broja.
- Preskakanje validacije kada aditivi, mješavine, oksidacija ili kontaminacija mogu izobličiti spektar.
Savjet za provjeru
Kada nejasnoća ostane, validirajte hipotezu pomoću DSC, GC-MS ili TGA, posebno za mješavine, degradirane uzorke i punjene polimere.
Literatura iza ovih dodjela
-
Acetate pouzdanost 1,0
“Absorption peaks due to C=O stretching appeared at 1752 cm-1 due to the ester bonds of the glyceride backbones which make up the oil.”
Walnut Oil Oleogels as Milk Fat Replacing System for Commercially Available Chocolate Butter DOI: 10.3390/gels8100613 -
Acetate pouzdanost 1,0
“The bands at 1692 and icalactivityobservedonvoltammogramduringthesecondcycle cm-1 are ascribed to C=O stretch vibrations in ketones 1752 of cyclic voltammetry oxidation of phenol.”
Regeneration of expanded graphite electrodes by joined electrochemical and ozone treatment in liquid phase DOI: 10.1007/s10008-018-4098-5 -
Alkyl C-H pouzdanost 1,0
“These findings confirmed the presence of an earlier and stretch at around 1752 In the varnished area, the previously undocumented varnish layer underneath the absorptions for the CH and CH stretch are relatively 2 3”
A non-invasive screening study of varnishes applied to three paintings by Edvard Munch using portable diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) DOI: 10.1186/s40494-019-0327-1 -
Acetate pouzdanost 1,0
“cm-1, cm-1 cm-1 into chitosan, new bands at 1751.85 1751.85 and 1743.72 for CS-Ag-H, CS-Ag-M and CS-Ag-L, respectively, are recognizable as C=O stretching vibration [41].”
Modification of Thin Film Composite Membrane by Chitosan–Silver Particles to Improve Desalination and Anti-Biofouling Performance DOI: 10.3390/membranes12090851 -
Alkyl C-H pouzdanost 1,0
“PLGA samples show their cm(cid:0) 1, 2900-3000 major bands at and 1752 agreeing with the C-H and C=O DSC curves of idebenone-loaded PLGA MSs were measured to stretching bands.”
Design, optimization, and in vitro characterization of idebenone-loaded PLGA microspheres for LHON treatment DOI: 10.1016/j.ijpharm.2022.121504 -
pouzdanost 0,9
“Explicit assignment in text: 'cm-1 1752cm-1 oxalyl chloride'”
Al balawi 等 - 2019 - Synthesis, Characterization, and Application of Po DOI: 10.1155/2019/7064073 -
Carbonyl (C=O) pouzdanost 0,9
“Explicit assignment: commonly assigned to carbonyl C=O group”
Sembiring 等 - 2019 - DOI: 10.1590/0366-69132019653742497 -
Carbonyl (C=O) pouzdanost 0,9
“Explicit assignment in text.”
Assessment of the Effect of PLGA Co-polymers and PEG on the Formation and Characteristics of PLGA-PEG-PLGA Co-block Polymer Using Statistical Approach DOI: 10.15171/apb.2019.045
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