What absorbs at 3698 cm⁻¹ in an FTIR spectrum?
A band near 3698 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
Snel antwoord
A band near 3698 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.
Mogelijke functionele-groeptoewijzingen
| Functionele groep | Ondersteunende feiten | Geciteerde bronnen | Hoogste vertrouwen |
|---|---|---|---|
| Hydroxyl (O-H) | 7 | 6 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Mogelijke materialen
| Materiaal | Ondersteunende pieken | Overlappende groepen | Geciteerde bronnen |
|---|---|---|---|
| kaolinite | 3698, 3696, 693 | Hydroxyl (O-H), Metal hydroxyl | 1 |
Materialen worden alleen getoond wanneer dezelfde literatuurpool deze band en ten minste één extra karakteristieke piek ondersteunt.
Spectrumlogica
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 3698 cm⁻¹ is usually not enough for material identification by itself.
Gebruik in de praktijk
Dit type query komt vaak voor bij polymeeridentificatie, screening van onbekende kunststoffen, probleemoplossing bij QC, verificatie van gerecycled materiaal en literatuurondersteunde beoordeling van piektoewijzing.
Veelgemaakte fouten
- Het behandelen van een enkele geïsoleerde band als bewijs van een materiaal zonder ten minste een of twee ondersteunende pieken te controleren.
- Overlap negeren: meerdere functionele groepen kunnen bijdragen rond hetzelfde golfgetal.
- Validatie overslaan wanneer additieven, mengsels, oxidatie of verontreiniging het spectrum kunnen verstoren.
Advies voor verificatie
Wanneer dubbelzinnigheid blijft bestaan, valideer de hypothese met DSC, GC-MS of TGA, vooral voor mengsels, gedegradeerde monsters en gevulde polymeren.
Literatuur achter deze toewijzingen
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vertrouwen 1,0
“cm-1 OHintense peak around 3698 is attributed to the and MgO nanoparticles prepared SEM image of Mg(OH) antisymmetric stretching vibration in the crystal structure 2 using different solvents are shown in Fig.”
Mageshwari 和 Sathyamoorthy - 2012 - Studies on Photocatalytic Performance of MgO Nanop DOI: 10.1007/s12666-011-0106-5 -
vertrouwen 1,0
“cm-1 Finally, the bands at ~3698 and 3620 (bands A and C, respectively) are due to AlAlOH stretching vibrations of kaolinite (Balan et al.”
Schingaro 等 - 2021 - New insights into the crystal chemistry of sauconi DOI: 10.2138/am-2020-7460. -
Hydroxyl (O-H) vertrouwen 1,0
“Only three OH stretching vibrations were observed at 3698, 3652, and 3621 301 in ADE and the adjacent soil, pointing to the poorly crystalline nature of kaolinite (Fig.”
Weng 等 - 2020 - Black carbon enriches short-range-order ferrihydri DOI: 10.1016/j.scitotenv.2020.138195 -
Hydroxyl (O-H) vertrouwen 1,0
“In the 1), FTIR spectrum of the halloysite clay mineral sample (spectrum the peaks at 3698 and cm-1 3623 were due to the stretching vibrations of the OH groups of the Al-OH.”
Enhancing the Thermal Stability of Ionogels: Synthesis and Properties of Triple Ionic Liquid/Halloysite/MCC Ionogels DOI: 10.3390/molecules26206198 -
Hydroxyl (O-H) vertrouwen 1,0
“cm-1), cm-1 cm-1 region (4000~1330 the spectral bands at 3698 and 3448 were related to did not only delay the combustion of the asphalt binder, but it also reduced the combusthe OH stretching vibrations of brucite and water in various state”
Thermal Degradation Characteristics of Styrene-Butadiene-Styrene Copolymer Asphalt Binder Filled with an Inorganic Flame-Retarding Agent DOI: 10.3390/polym14183761 -
Hydroxyl (O-H) vertrouwen 1,0
“d final pressure step to 1 mbar, the bands at 3698 and 3571 and 3200 The band assigned to the vibrations OH cm(cid:1)1 cm(cid:1)1, cm(cid:1)1.”
Muller 等 - 2004 - Interactions of water and methanol with MeAPO-5. F DOI: 10.1016/j.micromeso.2003.12.025 -
vertrouwen 1,0
“The absorption bands at 3698 and 550 corresponding to Mg-OH cm-1 stretching vibrations revealed the existence of an Mg(OH) film.”
Wang 等 - 2017 - In Vitro Degradation of PureMagnesium-The Effects DOI: 10.3390/ma10070725
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