What absorbs at 3732 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3732 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

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 3732 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.

これらのアサインの根拠となる文献

• Hydroxyl (O-H) 信頼度 1.0

  “increasing up to = 0.6, where there is a sharp discontinuity in and The infrared OH-stretching spectrum of the F F cm-1 MgMgMg-OH→ OH end-member shows a main band at 3732 which is assigned to the local Rb arrangement, and a cm-1 □ MgMgMg-OH”

  Synthesis and solid solution in “rubidium richterite”, Rb(NaCa)Mg5Si8O22(OH,F)2 DOI: 10.1007/s00269-019-01037-x
• Hydroxyl (O-H) 信頼度 1.0

  “The peak observed at 3732 was assigned to the O-H bond in PEO.”

  New Insight on Photoisomerization Kinetics of Photo-Switchable Thin Films Based on Azobenzene/Graphene Hybrid Additives in Polyethylene Oxide DOI: 10.3390/polym12122954
• Hydroxyl (O-H) 信頼度 1.0

  “as a very broad band from 2543 to blank-polymer particle, specific peaks of cromolyn appeared In the range of 3737cm-1, 1604cm-1 C�O, at 3732 to a weak band for the monomeric O-H due to and a band at approximately”

  Alkurdi 等 - 2022 - Development and Evaluation of a Novel Polymer Drug DOI: 10.1155/2022/7903310
• Hydroxyl (O-H) 信頼度 1.0

  “cm-1, cm-1 cm-1 3325 3330 3732 peaks at and corresponds - The FTIR spectroscopy confirms the presence of noncm-1 O-H 3732 to stretching bands [36,37] and the peak at polar groups on the surface that enhance hydrophobicO-H are assigned to st”

  Dergham 等 - 2022 - Hydrophobization of paper intended for packaging DOI: 10.31349/RevMexFis.68.031006
• 信頼度 1.0

  “The peaks at 3733 and cm(cid:3)1 Creative N-H N-H FTIR spectra of the PU peaks showed stretching vibration 3732 are related to the stretching vibration in the 2016.”

  Polyurethane/58S bioglass nanofibers: synthesis, characterization, and in vitro evaluation DOI: 10.1039/c5ra24786a
• Acetate 信頼度 1.0

  “The new characteristic peaks at 3732 cm-1, 3672 cm-1 and 3648 cm-1 cm-1 and C-O [35,36], and the characteristic peaks at 665 are caused by the bending of of bastnaesite treated with NHA are caused by the tensile vibration of N-H and C-O nap”

  Selective Adsorption of 2-Hydroxy-3-Naphthalene Hydroxamic Acid on the Surface of Bastnaesite and Calcite DOI: 10.3390/min12111341
• Hydroxyl (O-H) 信頼度 0.9

  “Isolated Si-OH band.”

  Negri 等 - 2018 - Investigating the Low Temperature Formation of Cu- DOI: 10.1002/chem.201802769