What absorbs at 3195 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3195 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 3195 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

• N h confidence 1.0

  “cm-1, aromatic stretch at 1658 OH stretch at 3345 and To investigate the diffusion coefficient of the hydrogels, a cm-1 NH stretch of amide at 3195 (Fig.”

  Owonubi 等 - 2018 - Characterization and in vitro release kinetics of DOI: 10.1007/s40090-018-0139-2
• Hydroxyl (O-H) confidence 1.0

  “(1) Completely spectra:thesedonotshowdetectableOHabsorptionpeaksabovenoise.(2)Spectrawithdetectablediscrete 3596cm(cid:1)1 3371-3380, OH peaks: discrete peaks are observed at 3195, 3205, 3305, 3483, and with the most 3380cm(cid:1)1.”

  Kilian 等 - 2016 - Dislocation creep of dry quartz DOI: 10.1002/2015JB012771
• N h confidence 1.0

  “In the spectrum of the CHXcm-1 cm-1 Bi complex, the stretching vibration bands at 3195 and 1625 corresponding cm-1 to the =NH and C=N groups, respectively, and the bending vibration band at 1520 corresponding to the secondary amino groups (”

  Kowalczuk 等 - 2021 - Spectroscopic Study of the Molecular Structure of DOI: 10.3390/molecules26051442
• Hydroxyl (O-H) confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Structural diversity of cocrystals formed from acridine and two isomers of hydroxybenzaldehyde: 3-hydroxybenzaldehyde and 4-hydroxybenzaldehyde DOI: 10.1039/d3ra02300a
• Ammonium confidence 1.0

  “cm-1 cm-1 the spectrum shows the presence of the bands at 3195 and at 3020 and 2820 that can be assigned to coordinated ammonia and to ammonium ions, respectively.”

  Preparation, Characterization and Catalytic Activity of Nickel Molybdate (NiMoO4) Nanoparticles DOI: 10.3390/molecules23020273
• Hydroxyl (O-H) confidence 1.0

  “FT-IR spectra attained from green-synthesized nanoparticles of nutmeg (Figure 6) FT-IR spectra attained from green-synthesized nanoparticles of nutmeg (Figure 6) cm-1 revealed bands at 3194.92 corresponding to -OH stretching, proving the pr”

  Phytosynthesis of Copper Nanoparticles Using Extracts of Spices and Their Antibacterial Properties DOI: 10.3390/pr9081341
• confidence 0.7

  “Same as above.”

  Yang 等 - 2020 - Preparation of novel amphoteric polyacrylamide and DOI: 10.1515/epoly-2020-0026