What absorbs at 3486 cm⁻¹ in an FTIR spectrum?
A band near 3486 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 5 cited sources
Quick answer
A band near 3486 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 |
| Water (H2O) | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| N 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 |
|---|---|---|---|
| Chitosan | 3486, 1650, 1655 | Hydroxyl (O-H) | 1 |
| polyimide | 3486, 1720, 1778 | Carboxyl (COOH) | 1 |
| starch | 3486, 1650, 1540 | Hydroxyl (O-H) | 1 |
| glycerol | 3486, 1585, 1630 | Hydroxyl (O-H), Carboxyl (COOH) | 1 |
| cotton | 3486, 1030, 1638 | 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 3486 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
-
Water (H2O) 置信度 1.0
“3234cm-1 3486cm-1 to indicates the replacement of free water Anti-plasticization is well known with lower glycerol concenH.Liuetal./CarbohydratePolymers83 (2011) 1591-1597 1595 for(a)extrudedpurestarch,(b)PSat20and70◦Cand(c)G210at20and70◦C.”
Glycerol/starch/Na+-montmorillonite nanocomposites: A XRD, FTIR, DSC and 1H NMR study DOI: 10.1016/j.carbpol.2010.10.018 -
置信度 1.0
“Text: 'The peaks at 3486 and 1602 represent N-H ODA.'”
Surface and structural changes in polyimide by 100 MeV Ag7+ ion irradiation DOI: 10.1016/j.surfcoat.2009.02.078 -
置信度 1.0
“The FTIR spectra of the C_P_ApI sample in the cm-1 peak at 3486 indicate N-H stretching due to the presence of chitosan.”
Hydrothermal Synthesis of Chitosan and Tea Tree Oil on Plain and Satin Weave Cotton Fabrics DOI: 10.3390/ma15145034 -
Hydroxyl (O-H) 置信度 1.0
“The is due to asymmetrical stretching cm-1 3486 band due to hydroxyl groups of water molecules vibration of the -COOH group.”
Nabipour 和 Sadr - 2015 - Layered zinc hydroxide-ibuprofen nanohybrids synt DOI: 10.1080/17458080.2014.998301 -
Hydroxyl (O-H) 置信度 1.0
“449 BONDINGINCOMPOSITEPROPELLANTS cm-1, The frequency of the O-H stretching vibtrations of isocyanurate (3486 cm-1 cm-1) 3386 and 3255 and the N-H stretching vibrations in ammonium percm-1) chlorate (3137 changed.”
Uscumlic 等 - 2006 - Investigation of the interfacial bonding in compos DOI: 10.2298/JSC0605445U
是否有此波段的光谱？
上传您的FTIR光谱，几秒钟内即可获得完整的解读报告——包含带文献引用的峰分配、库匹配和带有置信度评级的证据链。