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
Quick answer
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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| 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 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Possible materials
| Material | Stödjande toppar | Overlapping groups | Citerade källor |
|---|---|---|---|
| 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 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Litteratur bakom dessa identifieringar
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Alkyl C-H förtroende 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 förtroende 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 förtroende 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 förtroende 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 förtroende 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 förtroende 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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