What absorbs at 759 cm⁻¹ in an FTIR spectrum?
A band near 759 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 759 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 |
|---|---|---|---|
| Alkyl C-H | 5 | 5 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| C c single bond | 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 |
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 |
|---|---|---|---|
| Polystyrene | 759, 1020, 1600 | Aromatic ring, Alkyl C-H, Methoxy (OCH3) | 1 |
| ZIF-8 | 759, 1747, 1145 | Alkyl C-H | 1 |
| gold nanoparticles | 759, 1638, 3252 | Alkyl C-H | 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 759 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
-
Alkyl C-H pouzdanost 1,0
“2 759cm-1 1″-H 2′, 2″-H) confirming C-H and 2, are giving cross peaks that there is The peaks at 1002, 966, 909 and are due to wagging of”
Reactive grafting of 3-octanoylthio-1-propyltriethoxysilane in styrene butadiene rubber_ Characterization and its effect on silica reinforced tire composites DOI: 10.1016/j.polymer.2019.121693 -
Aromatic ring pouzdanost 1,0
“Another is at cm-1 at 759 which refers to the out-of-plane bending vibration of the five -CHgroups in the ring 759 cm-1 which refers to the out-of-plane bending vibration of the five -CHgroups in the ring of the of the monosubstituted benze”
Sulfonated Polystyrene Nanoparticles as Oleic Acid Diethanolamide Surfactant Nanocarriers for Enhanced Oil Recovery Processes DOI: 10.3390/polym11091513 -
Aromatic ring pouzdanost 1,0
“The cm-1 cm-1 850 is assigned to the aromatic C-H out-of-plane deformation, and the peak at 759 probably”
Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112 -
Acetate pouzdanost 1,0
“2 1204cm-1 878cm-1 (C-O C-O-C C-H-C), The effect of CSPS-1 on in vitro S-180 cell proliferation as a funcstretching of and (ab759cm-1”
Mei 等 - 2014 - Isolation, Characterization, and Antitumor Activit DOI: 10.1055/s-0034-1382960 -
Alkyl C-H pouzdanost 1,0
“cm-1 peak at 1154 The low-level band at 759 also confirmed nano-sized gold particles with uniform shape and different size the presence of C-H vibrations of aromatic compounds (Fig.”
Biogenic gold nanoparticles for reduction of 4‐nitrophenol to 4‐aminophenol: an eco‐friendly bioremediation DOI: 10.1049/iet-nbt.2017.0210 -
Alkyl C-H pouzdanost 0,9
“Assigned to bending vibrations of C-H single bond”
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
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