What absorbs at 3454 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3454 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.

Possible functional-group assignments

Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.

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 3454 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.

Literature behind these assignments

• Hydroxyl (O-H) confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Azhar 等 - 2020 - A study of different concentrations of bio-silver DOI: 10.1016/j.jwpe.2020.101575
• Hydroxyl (O-H) confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Greenhouse gases emissions from duckweed pond system treating polyester resin wastewater containing 1,4-dioxane and heavy metals DOI: 10.1016/j.ecoenv.2020.111253
• N h confidence 1.0

  “nanocomposite shows that the origin of the vibrational bands is as FT-IR spectra of the Pani-TiO 2 cm-1 cm-1 follows: a band at 3454 is due to the NH stretching of aromatic amines, another at 2854 505cm-1 is due to aromatic CH-stretching, a”

  Rajakani 和 Vedhi - 2013 - Synthesis and electrochemical studies of TiO2 - Pa DOI: 10.4028/www.scientific.net/AMR.678.263
• confidence 1.0

  “vibration peaks corresponding to the O-H and N-H groups (3454 However, these absorption strengths decreased in the processed seaweed, suggesting the decomposition of carbohydrates and proteins.”

  Efficiency of Fe3O4 Nanoparticles with Different Pretreatments for Enhancing Biogas Yield of Macroalgae Ulva intestinalis Linnaeus DOI: 10.3390/molecules26165105
• Hydroxyl (O-H) confidence 1.0

  “The band observed 3453.72 which is characteristic of O-H stretching”

  Hamida 等 - 2020 - Synthesis of Silver Nanoparticles Using a Novel Cy DOI: 10.2147/IJN.S238575
• Acetate confidence 1.0

  “Two characteristic peaks at 3454 and 333 can be ascribed to the asymis ascribed to the stretching vibration of C=O group from residual DMF solvent in the metric and symmetric stretching vibration of the primary amine group, respectively [29”

  Thin Film Mixed Matrix Hollow Fiber Membrane Fabricated by Incorporation of Amine Functionalized Metal-Organic Framework for CO2/N2 Separation DOI: 10.3390/ma14123366
• Acetate confidence 1.0

  “The bonds at 1639 cm-1 and 3454 cm-1 are attributed to C=O and OH group from COOH on oxidized SWNT, which indicates the”

  Liu 等 - 2014 - NIR initiated and pH sensitive single-wall carbon DOI: 10.1039/C3TB21362E.
• Water (H2O) confidence 1.0

  “A water peak at 3454 and a cm-1 stronger bands that grow in the spectra are due to water shoulder at 3270 also appear and grow, indicative of”

  MacMillan 等 - 2012 - Interaction of Water Vapor with the Surfaces of Im DOI: 10.1021/jp305029n