What absorbs at 3730 cm⁻¹ in an FTIR spectrum?
A band near 3730 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 7 cited sources
Quick answer
A band near 3730 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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| Hydroxyl (O-H) | 5 | 4 | 1,0 |
| Silanol (Si-OH) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Possible materials
| Materiale | Picchi di supporto | Overlapping groups | Fonti citate |
|---|---|---|---|
| kaolinite | 3730, 3696, 693 | Hydroxyl (O-H), Silicon-oxygen (Si-O), Water (H2O) | 1 |
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 3730 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.
Letteratura dietro queste assegnazioni
-
Hydroxyl (O-H) affidabilità 1,0
“and3796cm-1and OH/Na-vibration,thebandsat3579.1to3580.5cm-1,3395.2 possiblethatthe bandsappearedat3730 3415.4cm-1, 3354.4cm-1 in this region may be resulted due to the presence of Feto and 3351.5 to are probably OH-vibration.”
Ahmad 等 - 2021 - Spectroscopic Analysis for Harnessing the Quality DOI: 10.1155/2021/6629640 -
Silicon (Si) affidabilità 1,0
“The parent zeolite exhibits a low intensity cm-1, defects.[26] peak at 3730 commonly assigned to Si-OH in Deconvoluted peaks in the OH cm-1 region are shown in Figure S8.”
Comparative Study of Zeolite L Etching with Ammonium Fluoride and Ammonium Bifluoride Solutions DOI: 10.1002/admi.202000348 -
Silanol (Si-OH) affidabilità 1,0
“Band Assignments for Soils by and cm-1 band, inorganic (matrix) constituent organic constituent ATR PAS Si-OH 3730 stretching (kaolinite, clay) n/a”
Krivoshein 等 - 2022 - FTIR Photoacoustic and ATR Spectroscopies of Soils DOI: 10.1021/acsomega.1c05702 -
affidabilità 1,0
“cm(cid:3)1, z2254 DSC experiments were conducted on a TA Instruments 8020 sented by the peaks at and is supported by a very min(cid:3)1, cm(cid:3)1 (cid:1)C z800-1200 DSC at a heating rate of 20 strong absorbing band between in open alumini”
Combined thermal and FTIR analysis of porous silicon based nano-energetic films DOI: 10.1039/c6ra27028j -
Hydroxyl (O-H) affidabilità 1,0
“LLM confirmed rule peak-group candidate”
Sacchetto 等 - 2013 - The interactions of methyl tert-butyl ether on hig DOI: 10.1039/c3cp51684a -
affidabilità 0,8
“Peak at 3730.20 shows presence of organic acids group.”
Farooq 等 - 2022 - Preliminary Phytochemical Analysis In-Vitro Compa DOI: 10.1177/15593258211069720 -
Hydroxyl (O-H) affidabilità 0,7
“Additional band in OH region.”
Souissi 等 - 2022 - Synthesis, Thermal Properties and Electrical Condu DOI: 10.21203/rs.3.rs-1294285/v1
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