What absorbs at 3736 cm⁻¹ in an FTIR spectrum?
A band near 3736 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
Hurtigt svar
A band near 3736 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| Alginate | 3736, 1100, 1715 | Hydroxyl (O-H) | 1 |
| sodium alginate | 3736, 1636, 1080 | Hydroxyl (O-H) | 1 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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 3736 cm⁻¹ is usually not enough for material identification by itself.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Silanol (Si-OH) tillid 1,0
“For cm-1 SiBEA three characteristic bands at 3736, 3705 and 3520 may be attributed to isolated internal, terminal internal and hydrogen-bonded silanol groups, respectively, situated at vacant T-atom sites forming hydroxyl nests [14, 27].”
High activity of mononuclear copper present in the framework of CuSiBEA zeolites in the selective catalytic reduction of NO with NH3 DOI: 10.1016/j.micromeso.2015.11.065 -
Lipid tillid 1,0
“cm-1, ThePC2loadingplotshowsremarkablepositivevaluespeakingat3736, 3461, 3397 cm-1, 3022sh, 2962, 2926, 2878sh, and 2857 characteristic of lipids.”
The Role of the Preanalytical Step for Human Saliva Analysis via Vibrational Spectroscopy DOI: 10.3390/metabo13030393 -
Alkene (C=C) tillid 1,0
“Type of vibrations) (cm-1) (cm-1) (cm-1) Stretching vibration Symmetric C=C stretching vibration Stretching vibration of the 3736”
Hybrid Hosts Based on Sodium Alginate and Porous Clay Heterostructures for Drug Encapsulation DOI: 10.3390/xxxxx -
Hydroxyl (O-H) tillid 1,0
“of the cm-1 Vibration Peak position, vibration assignments Hydrogen chloride H-Cl asymmetric stretching 3150-2600 Saturated hydrocarbon C-H stretching 2935 Plasticizer (ester group) C-O-C symmetric stretching 1120 C-O-C asymmetric stretchin”
Zhao 等 - 2022 - Experimental investigation and numerical modeling DOI: 10.1007/s10973-022-11723-8 -
Hydroxyl (O-H) tillid 0,8
“Text: 'the most intense bands at 3736 and 3745 ... groups and isolated external groups'”
Engineering the porosity and acidity of H-Beta zeolite by dealumination for the production of 2-ethylanthraquinone via 2-(4′-ethylbenzoyl)benzoic acid dehydration DOI: 10.1039/c7ra13576a
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