What absorbs at 3747 cm⁻¹ in an FTIR spectrum?
A band near 3747 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 3747 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 |
|---|---|---|---|
| Silanol (Si-OH) | 4 | 3 | 1.0 |
| Hydroxyl (O-H) | 4 | 2 | 1.0 |
| Alkyl C-H | 1 | 1 | 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 |
|---|---|---|---|
| silica | 3747, 1100, 1080 | Hydroxyl (O-H), Silanol (Si-OH), Alkyl C-H | 3 |
| PVP | 3747, 2983, 1648 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| silica nanoparticles | 3747, 1718, 2925 | Silanol (Si-OH), Alkyl C-H, 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 3747 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
-
Silanol (Si-OH) 置信度 1.0
“We found cm-1 -CH and the increase of stretching and bending the decrease of isolated Si-OH peak intensity at 3747 2 peaks with increasing hydrolysis time, concentration and treatment time of BTMA.”
Jeon 等 - 2012 - Quantitative Analysis of Silanization Degree of Si DOI: 10.7317/pk.2012.36.3.372 -
Silanol (Si-OH) 置信度 1.0
“LLM confirmed rule peak-group candidate”
Ryu 等 - 2013 - Modification of Silica Nanoparticles with Bis[3-(t DOI: 10.7317/pk.2013.37.3.308 -
Hydroxyl (O-H) 置信度 1.0
“FTIR spectrum of Simvastatin showed peaks at 3550 cm-1 and 3747 cm-1, 2950 cm-1, 1740 cm-1, 1161 cm-1 and 1063 cm-1 due to -OH stretching, -CH stretching vibration, -C-Ostretching vibration of the carbonyl group and -C=O stretching vibratio”
Simvastatin Loaded Dissolvable Microneedle Patches with Improved Pharmacokinetic Performance DOI: 10.3390/mi13081304 -
置信度 0.95
“Same assignment as above.”
Lee 等 - 2019 - Adsorption properties of arsenic on sulfated TiO2 DOI: 10.1016/j.jiec.2019.08.024 -
Silanol (Si-OH) 置信度 0.9
“Explicit assignment in text: '3747cm-1 피크는 고립 실란올 피크'”
Jeon 和 Ha - 2012 - Studies on the Michael Addition Reaction between S DOI: 10.7317/pk.2012.36.6.822 -
置信度 0.9
“Text: 'narrow band at 3747 reflects terminal silanol groups (Si-OH)'”
Lemishka 等 - 2019 - Speciation and siting of divalent transition metal DOI: 10.1515/pac-2018-1228
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