What absorbs at 3398 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3398 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.

Mogelijke functionele-groeptoewijzingen

Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.

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 3398 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.

Literatuur achter deze toewijzingen

• Hydroxyl (O-H) vertrouwen 1,0

  “cm-1 Pure TA spectra displayed an infrared absorption band at 3398 related to the cm-1 hydrogen-bonded hydroxyl stretching vibration, at 1706 associated with stretching vibration of the carbonyl group (in the aliphatic ester bonds).”

  Chitosan-Coated PLGA Nanoparticles Encapsulating Triamcinolone Acetonide as a Potential Candidate for Sustained Ocular Drug Delivery DOI: 10.3390/pharmaceutics13101590
• N h vertrouwen 1,0

  “LLM confirmed rule peak-group candidate”

  Bouldin 等 - 2014 - Biocatalytic Synthesis of Fluorescent Conjugated I DOI: 10.3390/bioengineering1040246
• Hydroxyl (O-H) vertrouwen 1,0

  “LLM confirmed rule peak-group candidate”

  Han 等 - 2023 - Fourier Transform Infrared Spectrometry Detection DOI: 10.1021/acsomega.2c05933
• Silicon-oxygen (Si-O) vertrouwen 1,0

  “cm-1 The spectrum of SiO 2/GO (Figure 6c) showed an abroad peak at 3398 that The spectrum of SiO2/GO (Figure 6c) showed an abroad peak at 3398 cm-1 that becm-1 belonged to -OH groups of SiO and GO.”

  Sustainable Remedy Waste to Generate SiO2 Functionalized on Graphene Oxide for Removal of U(VI) Ions DOI: 10.3390/su14052699
• Metal oxygen vertrouwen 1,0

  “Viswanatha, Open FTIR spectroscopy, showing the broadening of the highUnderstanding the role of surface capping ligands in cm(cid:1)1 O-Zn-O]COH intensity peak at 3398 for coordination passivating the quantum dots using copper dopants as ef”

  l-Alanine capping of ZnO nanorods: increased carrier concentration in ZnO/CuI heterojunction diode DOI: 10.1039/c7ra12385j
• vertrouwen 1,0

  “Aloe vera showed an adsorp- -1, tion band of about 3398 cm which may be characteristic of amino acids due to the presence of hydrogen-bonded N cm-1 - H.”

  Naseriyeh 等 - 2022 - Preparation of liposomal hydrogel containing Calen DOI: 10.14715/cmb/2022.68.11.1
• Hydroxyl (O-H) vertrouwen 1,0

  “At high frequencies, the FTIR spectrum frequencies, the FTIR spectrum shows also a band at 3398 that corresponds to O-H bridging of Ramis and coworkers [37] and Wen and coworkers [38].”

  Preparation, Characterization and Catalytic Activity of Nickel Molybdate (NiMoO4) Nanoparticles DOI: 10.3390/molecules23020273
• Protein vertrouwen 0,9

  “Explicit assignment in text.”

  Developmental stages of biofilm and characterization of extracellular matrix of manglicolous fungus Aspergillus niger BSC‐1 DOI: 10.1002/jobm.201900550