What absorbs at 708 cm⁻¹ in an FTIR spectrum?
A band near 708 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 7 cited sources
Quick answer
A band near 708 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 |
|---|---|---|---|
| C-O single bond | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Ring 6m | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon carbon | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 0 | 1.0 |
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 |
|---|---|---|---|
| polyethylene | 708, 1737, 1720 | C-O single bond, Aromatic ring | 1 |
| HDPE | 708, 1369, 1216 | Aromatic ring | 1 |
| calcite | 708, 2850, 2864 | C-O single bond | 1 |
| quartz | 708, 800, 3053 | Silicon-oxygen (Si-O), Metal oxygen | 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 708 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
-
Silicon carbon 置信度 1.0
“According to Sawpan et al., peaks cm-1 cm-1 for Si-C symmetric stretching, at 708 for Si-O-Si symmetric at 780”
Hajiha 等 - 2014 - Modification and Characterization of Hemp and Sisa DOI: 10.1080/15440478.2013.861779 -
置信度 1.0
“The peak value at 707.74 was due to the presence of Fe 2O in RIPT”
Sakthisharmila 等 - 2017 - A characteristic study on generation and interacti DOI: 10.1016/j.molliq.2017.01.106 -
置信度 1.0
“The major peak at 708 shows the cm-1 presence of Mg-O vibrations.”
Abuhimd 等 - 2020 - Influence of Magnesium Aluminate Nanoparticles on DOI: 10.3390/coatings10100968 -
置信度 1.0
“Si-O-Al stretching vibrations at 707.58 and”
A Novel Open-System Method for Synthesizing Muscovite from a Biotite-Rich Coal Tailing DOI: 10.3390/min11030269 -
C-O single bond 置信度 1.0
“At 154 mainly caused by glycosidic bond, six-membered ring ◦C, decomposition and decarbonylation, the maximum heat release peak also occurs at 708 which 3.1.3.”
Synthesis of Phosphated K-Carrageenan and Its Application for Flame-Retardant Waterborne Epoxy DOI: 10.3390/polym10111268 -
Aromatic ring 置信度 1.0
“3054 CH aromatic rings (Symmetric stretching) CaCO 708 CO (Stretching) 3 3”
da Silva 和 Wiebeck - 2022 - ATR-FTIR Spectroscopy Combined with Chemometric Me DOI: 10.21203/rs.3.rs-905784/v1 -
Metal oxygen 置信度 0.9
“Explicit assignment in text”
Thakur 等 - 2022 - SUPERCRITICAL ANTISOLVENT METHOD FOR RECRYSTALLIZA DOI: 10.24425/cpe.2022.140819
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