What absorbs at 3733 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3733 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 3733 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

• Carbohydrate достоверность 1,0

  “The Materials2022,15,5992 11of17 cm-1 tion peaks at about 3733, 3500, 3492, 2920, 2826, 1946, 1536, 1372, and 864 were associated with the representative functional groups of cellulose [53,54].”

  Characterizations of Alpha-Cellulose and Microcrystalline Cellulose Isolated from Cocoa Pod Husk as a Potential Pharmaceutical Excipient DOI: 10.3390/ma15175992
• Hydroxyl (O-H) достоверность 1,0

  “LLM confirmed rule peak-group candidate”

  Amino Surface Modification and Fluorescent Labelling of Porous Hollow Organosilica Particles: Optimization and Characterization DOI: 10.3390/ma15072696
• Lewis acid site достоверность 1,0

  “Bands at 3733 and important decrease of the band characteristic of CO adsorption cm(cid:1)1, cm(cid:1)1) 3686 on medium and weak Lewis acid sites (2188 assigned respectively to neutral IIa hydroxyl are AlVI-OH groups and”

  Benkhaled 等 - 2006 - Synthesis of highly dispersed palladium alumina su DOI: 10.1016/j.apcata.2006.06.011
• достоверность 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
• Water (H2O) достоверность 1,0

  “cm-1 cm-1 In the GO-Ag spectrum, the peaks at 3850 and at 3733 can be assigned In the GO-Ag spectrum, the peaks at 3850 cm-1 and at 3733 cm-1 can be assigned to to the absorbed water due the stretching vibration of O-H group of carboxyl, al”

  Synthesis and Characterization of Some Graphene Oxide Powders Used as Additives in Hydraulic Mortars DOI: 10.3390/app112311330