What absorbs at 3748 cm⁻¹ in an FTIR spectrum?
A band near 3748 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 2 cited sources
Quick answer
A band near 3748 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 2 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 0.9 |
| Metal oxygen | 1 | 0 | 1.0 |
| Water (H2O) | 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 |
|---|---|---|---|
| SiO | 3748, 800, 1745 | 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 3748 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
“7.4, PBS), and (b) OH stretching vibrations of silanols at 3748 Revealing functionalities of HPF responsible for the formation of hydrogen bonds with the silanols is a complex task because HPF has many different Oand N-containing groups”
Rugal 等 - 2007 - Interaction of fibrinogen with nanosilica DOI: 10.2478/s11532-006-0067-4 -
Hydroxyl (O-H) 置信度 1.0
“A reliable method for estimating the ratio of the free 5 6 surface with free OH groups to silica volume is the normalizing of the integrated intensity of the 3748 7 8 cm-1 band (I 3748, i.e., a fraction of a free surface with free OH groups”
Sulym 等 - 2022 - Investigation of surface structure, electrokinetic DOI: 10.1021/cr940055h
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