What absorbs at 3810 cm⁻¹ in an FTIR spectrum?
A band near 3810 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 3 cited sources
Quick answer
A band near 3810 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Water (H2O) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 1 | 0 | 1,0 |
| Methacrylate | 1 | 0 | 1,0 |
| C-O single bond | 1 | 0 | 1,0 |
| Acetate | 1 | 0 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Possible materials
| Material | Vârfuri suport | Overlapping groups | Surse citate |
|---|---|---|---|
| CeO2 | 3810, 1554, 1630 | Hydroxyl (O-H), Methacrylate, Methoxy (OCH3) | 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 3810 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.
Literatura din spatele acestor atribuiri
-
Hydroxyl (O-H) încredere 1,0
“The band at exhibited in the sediment and filtrate spectra (Figure 11) at 1447 cm-1 for carbonate ions, cm-1 3810 is assigned to OH free stretching due to adsorbed water, together with the band CO32- [29-31];”
Saharan Dust Storm Aerosol Characterization of the Event (9 to 13 May 2020) over European AERONET Sites DOI: 10.3390/atmos13030493 -
Water (H2O) încredere 0,95
“Explicit assignment: 'bands at 3810 and 3715 correspond to asymmetric stretch and symmetric stretch' of molecular water”
Cebotari 等 - 2018 - Caracterisation of high manganese silicides prepar DOI: 10.21741/9781945291999-9 -
Hydroxyl (O-H) încredere 0,9
“Broad absorption band region 3810-3200 cm-1 assigned to hydrogen bonded OH of carboxyl and hydroxyl units.”
The chemistry concerned with the sonochemical-assisted synthesis of CeO_2/poly(amic acid) nanocomposites DOI: 10.3906/kim-1306-33
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