What absorbs at 3619 cm⁻¹ in an FTIR spectrum?
A band near 3619 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 3619 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) | 7 | 6 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Hydrogen bond | 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 |
|---|---|---|---|
| kaolinite | 3619, 3696, 693 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Metal oxygen | 3 |
| montmorillonite | 3619, 1637, 523 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Water (H2O) | 2 |
| nanotubes | 3619, 1735, 1630 | Hydroxyl (O-H) | 1 |
| bentonite | 3619, 882, 918 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Water (H2O) | 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 3619 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
“The peaks at 3619 and 3696 cm-1 are attributed to - OH vibration, which belong to the absorption of outer and inner hydroxyl groups, respectively [16].”
Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275 -
Hydroxyl (O-H) 置信度 1.0
“Assignments S3 G1 3623 -OH stretching 3619”
Hayati-Ashtiani - 2012 - Use of FTIR Spectroscopy in the Characterization o DOI: 10.1080/02726351.2011.615895 -
Hydroxyl (O-H) 置信度 1.0
“As seen in this figure, the weak peaks 3619 cm-1 and 3444 cm-1 were attributed to O-H stretching vibration, indicating the hydroxyl group on hybrid CNTs surface [35].”
Basheer 等 - 2020 - Synthesis, Characterization, and Analysis of Hybri DOI: 10.3390/polym12061305 -
Hydroxyl (O-H) 置信度 1.0
“hydroxyl groups Al-O-H stretching of inner surface 3651 3651 3651 3651 3651 3651 3651 3651 3651 3651 hydroxyl groups Al-O-H stretching of inner hydroxyl 3619 3619 3619 3619 3619 3619 3619 3619 3619 3621”
Oyebanjo 等 - 2018 - Mineral Constituents and Kaolinite Crystallinity o DOI: 10.1515/geo-2018-0012 -
Metal oxygen 置信度 1.0
“Al---O-Hstretchingofinnersurfacehydroxylgroups 3669 - 3670 3647-3641 Al---O-Hstretchingofinnersurfacehydroxylgroups 3651 - - Al---O-Hstretchingofinnerhydroxylgroups 3619 3620 3620 3620 1115-14 Si-Ostretching(Longitudinalmode) 1114 1107 1114”
Mineralogy and geochemistry of clay fractions in soils developed from different parent rocks in Limpopo Province, South Africa DOI: 10.1016/j.heliyon.2021.e07664 -
Water (H2O) 置信度 1.0
“The absorption bands at 3621 cm-1 for Cn-MT1 and 3619 cm-1 for Cn-MT2 are assigned to the stretching vibration of H2O on the surfaces of MT and -OH groups within the octahedral sheets [10].”
Qiu 等 - 2020 - Comprehensive Characterization of the Structure an DOI: 10.3390/min10040378 -
Hydrogen bond 置信度 0.9
“Peak assigned to hydrogen bonding between guar gum and Pb2+.”
Application of guar gum for the removal of dissolved lead from wastewater DOI: 10.1016/j.indcrop.2017.10.022 -
Hydroxyl (O-H) 置信度 0.9
“Explicit assignment: 'OH bands were observed at 3619'”
Madikizela 等 - 2017 - Physicochemical Characterization and In Vitro Eval DOI: 10.17159/0379-4350/2017/v70a016
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