What absorbs at 769 cm⁻¹ in an FTIR spectrum?
A band near 769 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
Quick answer
A band near 769 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.
可能的官能团归属
| 官能团 | 支持性事实 | 引用来源 | 最高置信度 |
|---|---|---|---|
| Metal oxygen | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 0.9 |
| N h | 1 | 1 | 0.9 |
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
Possible materials
| 材料 | 支持峰 | Overlapping groups | 引用来源 |
|---|---|---|---|
| PEG | 769, 1650, 1342 | Hydroxyl (O-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 769 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.
这些分配背后的文献
-
Hydroxyl (O-H) 置信度 1.0
“However, the cm-1 broad intense band at 3400-3419 in the sample showed the existence of -OH stretching vibration (hydroxyl / phenol) generated by the phenol group, which was confirmed by the presence of 768.55 cm-1 in the non-anneal sample.”
Fabiani 等 - 2020 - Green synthesis and characterization of Zinc Ferri DOI: 10.1088/1755-1315/599/1/012066 -
Alkyl C-H 置信度 1.0
“the wagging deformation band at 769 from C-H Additionally, 1,5-hexadiene was identified as a decomposition various vibrations of the hexene moiety, which were also Creative β-elimination) product (via a for all hb-FRs via the bands at obser”
Battig 等 - 2019 - Hyperbranched phosphorus flame retardants multifu DOI: 10.1039/c9py00737g -
Hydroxyl (O-H) 置信度 1.0
“cm-1 3678 [34,35] and O-H deformation at 765 and 769 The band occurred at 2860 due to 3678 cm-1 [34,35] and O-H deformation at 765 and 769 cm-1.”
Kumar 等 - 2020 - Polyethylene Glycol (PEG) Modified Porous Ca-5(PO4 DOI: 10.3390/coatings10060538 -
置信度 1.0
“The stretching vibration characteristic peaks of the Fe-O bond in ferrate were obThe stretching vibration characteristic peaks of the Fe-O bond in ferrate were obtained cm-1, cm-1, cm-1 tained at around 700 cm-1, 769 cm-1, 879 cm-1 and conf”
Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt DOI: 10.3390/w13192619 -
Silicon (Si) 置信度 1.0
“The band at 769 was assigned to the Si-O symmetric cm-1 stretching or bending mode whereas the band at 947 was assigned to the Si-O stretching mode of non-bridging oxygen.”
Zaid 等 - 2017 - Effect of Sintering on Crystallization and Structu DOI: 10.2298/SOS1704409Z -
Metal oxygen 置信度 0.9
“Explicit assignment.”
Saliu 等 - 2017 - Catalytic crosslinking of a regenerated hydrophobi DOI: 10.1515/epoly-2016-0289 -
Phosphate (PO4) 置信度 0.9
“Text: '769 cm-1 stretching of C-OP bond'”
Yasmin 等 - 2022 - Biosorptive Potential of Pseudomonas species RY12 DOI: 10.1177/15593258221117352 -
置信度 0.8
“Text: 'ν (ν ν (ν region accounts for the fundamental bands = 768.809'”
High resolution FTIR spectrum of CH2D79Br: the ground, v5 = 1 and v9 = 1 state constants DOI: 10.1080/00268970903567270
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