What absorbs at 3388 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3388 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 3388 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

• Hydroxyl (O-H) достоверность 1,0

  “Earlier studies have established cm-1, cm-1, cm-1, of tea extracts containing polyphenols have appeared at 3388 1636 and 1039 which that the FTIR bands of tea extracts containing polyphenols have appeared at 3388 cm-1, 1636 cm-1, are referr”

  Aziz 等 - 2017 - From Insulating PMMA Polymer to Conjugated Double DOI: 10.3390/polym9110626
• Hydrogen bond достоверность 1,0

  “LLM confirmed rule peak-group candidate”

  Xiao 等 - 2020 - Preparation and characterization of broken-rice st DOI: 10.1016/j.ijbiomac.2020.05.182
• Acetate достоверность 1,0

  “of polyphenols in different tea extracts (black, oolong, and green) due to O-H/N-H, C=C, sent results are consistent with those of previous studies that demonstrated the presence cm-1, cm-1, cm-1 C-O-C stretches at 3388 1636 and 1039 [51-55”

  Green Synthesis of Silver and Titanium Oxide Nanoparticles Using Tea and Eggshell Wastes, Their Characterization, and Biocompatibility Evaluation DOI: 10.3390/su151511858
• Amide достоверность 1,0

  “ary structure of the protein, while the amide II band indicates the in-plane folding of the The FTIR spectra of OMC-SPE/Lac (Figure 1) show prominent peaks at 3388, 1655, cm-1.”

  Development of a Novel Electrochemical Biosensor Based on Organized Mesoporous Carbon and Laccase for the Detection of Serotonin in Food Supplements DOI: 10.3390/chemosensors10090365
• Hydroxyl (O-H) достоверность 1,0

  “LLM confirmed rule peak-group candidate”

  Efe 等 - 2013 - Synthesis of 4-Acryloylmorpholinebased Hydrogels DOI: 10.5935/0103-5053.20130107
• достоверность 1,0

  “Therefore, infrared spectra in the region of 4000-2750 showed 448 cm-1 diclofenac bands at 3388 and 2357 assigned to free and bound N-H stretching,”

  Franca 等 - 2020 - Monitoring diclofenac adsorption by organophilic a DOI: 10.1016/j.envpol.2013.04.012
• достоверность 1,0

  “The peaks at 3387.80 represent amines N-H stretch and”

  Biodegradation of Azo Dye Methyl Red by Pseudomonas aeruginosa: Optimization of Process Conditions DOI: 10.3390/ijerph19169962
• Hydroxyl (O-H) достоверность 1,0

  “Due to the high capacity of silica to adsorb water, the absorption bands resulting from the vibrations of the O-H bond are located at the following positions: 3388 cm-1 (O-H sv) and 1513 cm-1 (O-H bv) [54].”

  Chemical Doping of a Silica Matrix with a New Organic Dye from the Group of Heterocyclic Compounds—Chemical, Optical and Surface Characteristics DOI: 10.3390/cryst12040478