What absorbs at 542 cm⁻¹ in an FTIR spectrum?
A band near 542 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 6 cited sources
Brzi odgovor
A band near 542 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 |
|---|---|---|---|
| Aromatic ring | 2 | 2 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
Rangiranje odražava akumulirane literaturne dokaze, a ne jedno autoritativno pravilo. Uvijek provjerite u kontekstu vašeg uzorka.
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 542 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
-
Metal oxygen pouzdanost 1,0
“of C-O-C at 1147 and Fe-O stretching at 542 The maximum Cr(IV) removal efficiency of 91.8% was recorded at an initial Cr(VI) concentration of 40 mg/L, pH of 3, adsorbent dose of 100 mg/100 mL, and a contact time of 90 min, whereas the minim”
Magnetite-impregnated biochar of parthenium hysterophorus for adsorption of Cr(VI) from tannery industrial wastewater DOI: 10.1007/s13201-023-01880-y -
Aromatic ring pouzdanost 1,0
“The unique benzene ring in TPPO absorption peak at 542 To avoid adding such a marker to every sample, we found an oil characteristic peak (4334/”
Li 等 - 2018 - Novel method based on fourier transform infrared s DOI: 10.1080/10942912.2017.1381113 -
Acetate pouzdanost 1,0
“cm-1 group absorption peak between 1,500 and 1,400 the band between 1,542 cm-1 and 965 is attributed to vibration of the C-O, C-N, and C-N, demonstrating the cm-1 presence of organic acids, sugars, and ethanol in this area;”
Zhao 等 - 2021 - Evaluation of a strawberry fermented beverage with DOI: 10.7717/peerj.11974 -
Carboxyl (COOH) pouzdanost 1,0
“The band at 542 is attributed to the vibrations of CoO units of 2, the band at 479 cm-1 is attributed to the bending vibrations of O-P-O in (PO2-)n chain 6 cm-1 CoIII-O bonds [19,20].”
The Influence of CoO/P2O5 Substitutions on the Structural, Mechanical, and Radiation Shielding of Boro-Phosphate Glasses DOI: 10.3390/ma14216632 -
Aromatic ring pouzdanost 1,0
“p-cymene, being an aromatic hydrocarbon, exhibited several signals in the fingerprint region at 1514, 813, 720/542 cm-1, due to aromatic C=C-C ring stretch, C-H of para disubstituted aromatic rings, and aromatic C-H out-ofplane bends.”
Rapid Classification and Recognition Method of the Species and Chemotypes of Essential Oils by ATR-FTIR Spectroscopy Coupled with Chemometrics DOI: 10.3390/molecules27175618 -
pouzdanost 0,8
“Explicit assignment: band for iron-oxide at 542 cm-1”
Structural characterization and adsorptive ability of green synthesized Fe3O4 nanoparticles to remove Acid blue 113 dye DOI: 10.1016/j.surfin.2021.100947
Imate li spektar s ovom vrpcom?
Prenesite svoj FTIR spektar i dobijte potpuno izvješće o interpretaciji — dodjele vrhova s literaturnim citatima, podudaranja knjižnice i lanac dokaza s ocjenom pouzdanosti — u sekundama.