What absorbs at 3227 cm⁻¹ in an FTIR spectrum?
A band near 3227 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 4 cited sources
Quick answer
A band near 3227 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.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| Secondary amine | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 0.9 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
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 3227 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.
Literatur di sebalik penetapan ini
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Carbonyl (C=O) keyakinan 1.0
“The strong broad worth noting that the H 2cap may coordinate metal cm-1 band at 3423 and shoulder intensity band at 3227 ions via -COOH carboxylic, >C=O carbonyl and -SH are assigned to ν and ν models of water molecules thiol.”
Alibrahim - 2022 - FTIR, H-1 NMR, TGA, TEM AND BIOLOGICAL STUDIES ON DOI: 10.31925/farmacia.2022.1.19 -
N h keyakinan 1.0
“SO 4+ cm-1, is well correlated with the NH absorption band at 3227 and 638 due to the formation of internally mixed particles during long-term transport from urban sources [7] and BB season [46].”
Popovicheva 等 - 2020 - Functional Factors of Biomass Burning Contribution DOI: 10.3390/atmos11040319 -
N h keyakinan 1.0
“2), 5.09 (dd, = 10.5, 2.0 Hz, 2H, Ha, Hc), 5.27 (s, 2H, NH 260(cid:3)C 262(cid:3)C, δ 13C-NMR (75 MHz, DMSO-d 6) 161.2 (C4), Off white solid, Yield: 82%, m.p: to Rf: 0.67 (s, 1H, Hd), cm-1): n-hexane 149.54 (C7), 149.46 (C6), 143.7 (C14), 1”
Development of an Efficient, One-Pot, Multicomponent Protocol for Synthesis of 8-Hydroxy-4-Phenyl-1,2-Dihydroquinoline Derivatives DOI: 10.1002/jhet.4193 -
Hydroxyl (O-H) keyakinan 0.9
“Explicit assignment in text: 'band at 3330, 3227 for hydroxyl stretching vibration'”
Puerarin-coated gold nanoparticles (PUE-AuNPs) synthesized via green synthetic route: a new colorimetric probe for the detection of ciprofloxacin DOI: 10.3906/kim-2106-4
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