What absorbs at 3641 cm⁻¹ in an FTIR spectrum?
A band near 3641 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 3641 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) | 6 | 6 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 0 | 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 |
|---|---|---|---|
| CaO | 3641, 2909, 1839 | Hydroxyl (O-H) | 1 |
| calcium carbonate | 3641, 3232, 2954 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| hydroxyapatite | 3641, 1620, 1639 | Hydroxyl (O-H), Alkyl C-H | 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 3641 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
-
vertrouwen 1,0
“presence of Ca(OH) is indicated by the emer2 gence of stretching absorption bands from O-H at 3641 cm-1 and also the Ca-O stretching in 700-900 cm-1 absorption band [18,33] that is supported by XRD data in Figure 6.”
Natural Clay of Pasaman Barat Enriched by CaO of Chicken Eggshells as Catalyst for Biodiesel Production DOI: 10.9767/bcrec.15.3.8097.662-673) -
vertrouwen 1,0
“= g/mol) (Mn vibration peak of the hydroxyl group in GAP 1000 is at 3641 It can be seen from the vibration peak of the hydroxyl group in GAP (Mn = 1000 g/mol) is at 3641 cm-1.”
The Effect of Glycidyl Azide Polymer Grafted Tetrafunctional Isocyanate on Polytriazole Polyethylene Oxide-Tetrahydrofuran Elastomer and its Propellant Properties DOI: 10.3390/polym12020278 -
Hydroxyl (O-H) vertrouwen 1,0
“LLM confirmed rule peak-group candidate”
Molla 等 - 2022 - Facile extraction and characterization of calcium DOI: 10.1098/rsos.220681 -
Hydroxyl (O-H) vertrouwen 1,0
“The band at 3641 present in the calcium 411 hydroxide sample is related to its OH bonds.”
Moraes 等 - 2019 - Production of bamboo leaf ash by auto-combustion f DOI: 10.1016/j.conbuildmat.2019.03.007 -
Silicon (Si) vertrouwen 1,0
“Band at 3641 was assigned to Si-OH As this peak was not seen in C20A additive alone, it was hydroxyl stretching in clays modified using silanes [30].”
Ross 等 - 2017 - Micro and nanocomposites of polybutadienebased pol DOI: 10.1515/chem-2017-0006 -
Hydroxyl (O-H) vertrouwen 1,0
“Hydroxyl and carboxyl funcabsorption band at ~ 3641 (free O-H stretchtional groups present in sticky rice and its alkaline ing from portlandite) is higher in the specimens with”
Zhang 等 - 2021 - Effects of sticky rice addition on the properties DOI: 10.1186/s40494-020-00475-z -
Hydroxyl (O-H) vertrouwen 0,9
“Explicit: 'band at 3641 cm-1 ... O-H' and 'identi?ed the hydroxyl of the portlandite phase'.”
Hydroxyapatite synthesis from a starfish and β-tricalcium phosphate using a hydrothermal method DOI: 10.1039/c6ra26907a
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