What absorbs at 1436 cm⁻¹ in an FTIR spectrum?

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.

可能的官能团归属

排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。

Possible materials

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.

这些分配背后的文献

• Alkyl C-H 置信度 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
• 置信度 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 置信度 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 置信度 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 置信度 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 置信度 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 置信度 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
• 置信度 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