What absorbs at 3648 cm⁻¹ in an FTIR spectrum?
A band near 3648 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 5 cited sources
Quick answer
A band near 3648 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Possible materials
| Material | Stödjande toppar | Overlapping groups | Citerade källor |
|---|---|---|---|
| CaCO3 | 3648, 1141, 712 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| CaO | 3648, 2909, 1839 | Hydroxyl (O-H), 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 3648 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 bakom dessa identifieringar
-
Hydroxyl (O-H) förtroende 1,0
“LLM confirmed rule peak-group candidate”
Enhanced efficacy of clindamycin hydrochloride encapsulated in PLA/PLGA based nanoparticle system for oral delivery DOI: 10.1049/iet-nbt.2015.0021 -
Hydroxyl (O-H) förtroende 1,0
“LLM confirmed rule peak-group candidate”
Romeo 和 Fanovich - 2008 - Synthesis of tetracalcium phosphate from mechanoch DOI: 10.1007/s10856-008-3403-8 -
Acetate förtroende 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 -
förtroende 0,95
“Explicit assignment: 'The band at 3648 in Mg smectite precursor ... is assigned vMg3OH'”
The crystal growth of smectite: A study based on the change in crystal-chemistry and morphology of saponites with synthesis time DOI: 10.1021/ac -
Hydroxyl (O-H) förtroende 0,9
“Text: '3OH stretching signature at 3648'.”
Schingaro 等 - 2021 - New insights into the crystal chemistry of sauconi DOI: 10.2138/am-2020-7460.
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