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
Quick answer
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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| 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 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Possible materials
| Materiale | Picchi di supporto | Overlapping groups | Fonti citate |
|---|---|---|---|
| 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 |
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 1436 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.
Letteratura dietro queste assegnazioni
-
Alkyl C-H affidabilità 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 -
affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 affidabilità 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 -
affidabilità 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
Hai uno spettro con questa banda?
Carica il tuo spettro FTIR e ottieni un report di interpretazione completo — assegnazioni di picchi con citazioni bibliografiche, corrispondenze con librerie e una catena di prove con valutazione di affidabilità — in secondi.