What absorbs at 1436 cm⁻¹ in an FTIR spectrum?
A band near 1436 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
Schnelle Antwort
A band near 1436 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| Alkene (C=C) | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Carbonate | 2 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Fluorine (C-F) | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Mögliche Materialien
| Material | Unterstützende Peaks | Überlappende Gruppen | Zitierte Quellen |
|---|---|---|---|
| TiO2 | 1436, 1700, 1093 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| PVA | 1436, 1660, 2930 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| cellulose nanocrystals | 1436, 1110, 1640 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.
Spektrumslogik
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 1436 cm⁻¹ is usually not enough for material identification by itself.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
Alkyl C-H Vertrauen 1,0
“The characteristic band appearing at 1436 is assigned to C-H bend of CH of PVA”
Sathish 等 - 2013 - Nano Composite PVA-TiO2 Thin Films for OTFTs DOI: 10.4028/www.scientific.net/AMR.678.335 -
Vertrauen 1,0
“FTIR Spectroscopy Studies cm-1 cm-1 cm-1 cm-1 1727 due to C-O stretch, 2900 and 2964 due to N-H stretches, 1436 cm-1 and 1409 due to NNH bending, and 778 due to NH out of plane bending of the CNH The FTIR spectra of pure Irbesartan provided”
How to Improve Solubility and Dissolution of Irbesartan by Fabricating Ternary Solid Dispersions: Optimization and In-Vitro Characterization DOI: 10.3390/pharmaceutics14112264 -
Carbonate Vertrauen 1,0
“The band at 1436 can be attributed to free carbonates [55, 56, 59].”
Towards Methane Combustion Mechanism on Metal Oxides Supported Catalysts: Ceria Supported Palladium Catalysts DOI: 10.1007/s11244-019-01143-8 -
Alkyl C-H Vertrauen 1,0
“LLM confirmed rule peak-group candidate”
Emeje 等 - 2020 - Physicochemical and drug release properties of mic DOI: 10.1590/0104-1428.07418 -
Alkyl C-H Vertrauen 1,0
“Cellulose was The absorption peak at 1436 was the bending vibraa typical chain compound containing a crystalline region and tion associated with -CH and O-CH.”
Isolation and characterization of cellulose nanocrystals from Chinese medicine residues DOI: 10.1007/s13399-022-03380-6 -
Ammonium Vertrauen 1,0
“LLM confirmed rule peak-group candidate”
Ammonium alum in alum-treated wooden artefacts: discovery, origins and consequences DOI: 10.1186/s40494-019-0321-7 -
Acetate Vertrauen 1,0
“~1370 cm-1 and ~1436 cm-1 can be ascribed to the C-O stretching, C-O-C stretching, CBriefly, by recalling well-known assignments already reported in the literature [39,42-46],”
Temperature-Dependent Dynamical Evolution in Coum/SBE–CD Inclusion Complexes Revealed by Two-Dimensional FTIR Correlation Spectroscopy (2D-COS) DOI: 10.3390/molecules26123749 -
Vertrauen 1,0
“The FTIR spectrum of the pure drug showed the characteristic peaks at 1650.76 due to C=O stretching, at 3364.90 due to O-H stretching, 3252.43 due to N-H stretch, 1435.82 due to C-F stretching,”
Dissolution Improvement of Atorvastatin Calcium using Modified Locust Bean Gum by the Solid Dispersion Technique DOI: 10.3797/scipharm.1301-23
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