What absorbs at 3177 cm⁻¹ in an FTIR spectrum?
A band near 3177 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 3177 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 |
|---|---|---|---|
| N h | 3 | 2 | 1,0 |
| Phenolic | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
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 3177 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
-
Secondary amine förtroende 1,0
“The N-H) of the thioamide and amide can be observed at asymmetric stretching vibration of the secondary amine (ν 3177cm-1 3120cm-1 and respectively.”
Adan 等 - 2014 - Synthesis, Characterization and Antibacterial Stud DOI: 10.1063/1.4895199 -
Hydroxyl (O-H) förtroende 1,0
“FTIR spectrum of pure UMB disclosed typical absorption the complex UMB + was 1:1 in agreement with the linear cm-1 (-O-H Benesi-Hildebrand bands at 3177 for phenolic stretching), 1603 plot obtained from the method.”
Roy 等 - 2020 - Exploring the Inclusion Complex of a Drug (Umbelli DOI: 10.1021/acsomega.0c04716 -
förtroende 1,0
“Characterization of LPDC cm-1 and 3177 cm-1 were the stretching vibration of N-H in NH [37].”
Novel Hydroxyl-Containing Quaternary Ammonium Salt N-(2-Hydroxyethyl)-N, N-Dimethyl-3-[(1-Oxododecyl)amino]- 1-Propanaminium: Its Synthesis and Flotation Performance to Quartz DOI: 10.3390/min13050702 -
förtroende 0,9
“Text: 'm(N–H) The band is present at 3177'”
Houari 等 - 2019 - New synthetic material removing heavy metals from DOI: 10.1016/j.arabjc.2016.11.010
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