What absorbs at 2810 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 2810 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.

Возможные назначения функциональных групп

Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.

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 2810 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.

Литература, лежащая в основе этих назначений

• Acetate достоверность 1,0

  “The Salcan be assigned as follows: (O-H stretching), 2881cm-1 monella cell had a spectrum with unique peaks at wave num- (C-H asymmetric stretching of CH in aliphatic 2 2810cm-1 bers 1654 C=O vibration stretching of amide I, 1544 C-N compou”

  Sukprasert 等 - 2020 - Synchrotron FTIR Light Reveals Signal Changes of B DOI: 10.1155/2020/6149713
• Hydroxyl (O-H) достоверность 1,0

  “Confirmation of MC/PC Backbone According to the literature, the FTIR spectrum of pristine MC exhibits characteristic belonging to O-H stretching, and C-H asymmetric bands in the vicinity of 3250 and 2810 cm-1 stretching, respectively.”

  Substantial Proton Ion Conduction in Methylcellulose/Pectin/Ammonium Chloride Based Solid Nanocomposite Polymer Electrolytes: Effect of ZnO Nanofiller DOI: 10.3390/membranes12070706
• Acetate достоверность 1,0

  “The peaks at 2950 and 2810 cm-1 were attributed cm-1 C=O -CH 2stretching vibrations of the PEI.”

  Facile Construction of Functionalized GO Nanocomposites with Enhanced Antibacterial Activity DOI: 10.3390/nano9070913
• Alkyl C-H достоверность 1,0

  “LLM confirmed rule peak-group candidate”

  Samie 等 - 2018 - Design, Formulation and In Vitro Evaluation of Sus DOI: 10.4274/tjps.29200
• N-O bond достоверность 1,0

  “peak 3402.43 and 2809.80 However, no new peak appeared in the spectrum of zophora spp.”

  Influence of Different Percentages of Binders on the Physico-Mechanical Properties of Rhizophora spp. Particleboard as Natural-Based Tissue-Equivalent Phantomfor Radiation Dosimetry Applications DOI: 10.3390/polym13111868