What absorbs at 3665 cm⁻¹ in an FTIR spectrum?
A band near 3665 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 8 cited sources
Quick answer
A band near 3665 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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| Hydroxyl (O-H) | 7 | 6 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Bromine | 1 | 1 | 1,0 |
| Metal hydroxyl | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
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 3665 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.
Litteratur bag disse tildelinger
-
Metal hydroxyl tillid 1,0
“cm-1 Al-OH Ni-ZSM-5 Finally, the band at 3665 was shifted to 3470 It has been reported that reduction of with CO leads cm-1 cm-1), ) -195”
Penkova 等 - 2007 - Effect of the preparation method on the state of n DOI: 10.1021/jp071927p -
Bromine tillid 1,0
“A band at 3610 cm-1 and a shoulder band at 3665 are assigned to the Brönsted OH”
IR study of iridium bonded to perturbed silanol groups of Pt-HZSM5 for n-pentane isomerization DOI: 10.1016/j.apcata.2011.12.039 -
Carbon dioxide tillid 1,0
“8 showed the functional groups present on the date 2350.40, 2360.4, 2383.40 - Carbon dioxide stone-derived activated carbon, whereas bands appeared at 3665.45, (O--C--O) 2325.00 2349.47, 2817.79, 2124.28, 1905.70, 1444.61, 1123.54, and 529.”
Preparation and characterization of activated carbon from agricultural wastes and their ability to remove chlorpyrifos from water DOI: 10.1016/j.toxrep.2023.01.011 -
Hydroxyl (O-H) tillid 1,0
“LLM confirmed rule peak-group candidate”
Isolation, Characterization, and Breast Cancer Cytotoxic Activity of Gyrophoric Acid from the Lichen Umbilicaria muhlenbergii DOI: 10.3390/pr10071361 -
Hydroxyl (O-H) tillid 1,0
“cm-1 After subtraction of the water monomer spectrum, this band is located at 3664.8 and 8 assigned to the symmetric O-H stretching mode of H 2O perturbed by the CO”
Vibrational investigations of CO2-H2O, CO2-(H2O)2, and (CO2)2-H2O complexes isolated in solid neon DOI: 10.1063/1.4936913 -
Hydroxyl (O-H) tillid 1,0
“cm-1, Additionally, the PZ5 zeolite shows a band at 3665 which corresponds to hydroxyl groups interacting with P (P-OH species) [32].”
Valecillos 等 - 2020 - Slowing down the deactivation of H-ZSM-5 zeolite c DOI: 10.1016/j.cattod.2019.07.059 -
Hydroxyl (O-H) tillid 0,9
“Explicit assignment in text.”
Samra 和 Athar - 2009 - Novel Synthesis of Mannosamine Conjugated Magnetic DOI: 10.1007/s12257-008-0314-y -
Hydroxyl (O-H) tillid 0,9
“Band at 3665 cm-1 due to stretching.”
Erigoni 等 - 2016 - Creating Accessible Active Sites in Hierarchical M DOI: 10.1038/ncomms9633.
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