What absorbs at 3391 cm⁻¹ in an FTIR spectrum?
A band near 3391 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 6 cited sources
Stutt svar
A band near 3391 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.
Mögulegar úthlutun virkra hópa
| Virkur hópur | Stuðningsstaðreyndir | Tilvitnuð heimildir | Mesta öryggi |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
Röðun endurspeglar uppsöfnuð ritrýnisgögn, ekki eina valdboðsreglu. Staðfestu alltaf í samhengi við sýnið þitt.
Möguleg efni
| Efni | Stuðningstindar | Skarast hópar | Tilvitnuð heimildir |
|---|---|---|---|
| SnO2 | 3391, 2800, 1547 | Hydroxyl (O-H) | 1 |
Efni birtast aðeins þegar sama bókmenntasafn styður þessa band og að minnsta kosti einn viðbótar einkennandi hámark.
Rófrök
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 3391 cm⁻¹ is usually not enough for material identification by itself.
Raunveruleg notkun
Þessi tegund fyrirspurna er algeng við auðkenningu fjölliða, skimun óþekktra plasttegunda, bilanaleit í gæðaeftirliti, staðfestingu endurunnins efnis og bókmenntabakkaða endurskoðun á hápunktum.
Algeng mistök
- Meðhöndla eina einangraða öldulengd sem sönnun á efni án þess að athuga að minnsta kosti einn eða tvo stuðningstoppa.
- Hunsa skörun: mörg virkir hópar geta lagt sitt af mörkum nálægt sömu bylgjutölunni.
- Að sleppa staðfestingu þegar aukefni, blöndur, oxun eða mengun geta brenglað litrófið.
Staðfestingarráðgjöf
Þegar tvíræðni er eftir, staðfestu tilgátuna með DSC, GC-MS eða TGA, sérstaklega fyrir blöndur, niðurbrotin sýni og fylltar fjölliður.
Ritlist á bak við þessar úthlutanir
-
Hydroxyl (O-H) öryggi 1,0
“2 cm-1, cm-1 SnO nanoparticles show transmittance peaks at 3391 and 1568 which are associated to the 2 cm-1, vibration of stretching OH, while peaks at a wave number of 625, 930, and 1635 indicating the appearance of the stretching mode of”
Diantoro 等 - 2018 - Control of Dielectric Constant and Anti-Bacterial DOI: 10.1088/1757-899X/367/1/012012 -
Carboxyl (COOH) öryggi 1,0
“(6 h without toluene), which displayed a hydroxyl peak absorption, but without the unsaturation removal, and the synthetic reaction with formic acid that presented a peak elongation in the hydroxyl (3391 cm-1) and unsaturation loss (3009 cm”
Montenegro 等 - 2023 - Enzymatic and Synthetic Routes of Castor Oil Epoxi DOI: 10.3390/polym15112477 -
N h öryggi 1,0
“1200 900 These peaks are assigned cm-1, Polypyrrole exhibit characteristic peaks at 3391 to NH stretching vibration (ν-NH 2), CH stretching cm-1, cm-1, cm-1, cm-1, cm-1 1536 1444 1297 1041 784”
Moosvi 等 - 2016 - Studying the electrical, thermal, and photocatalyt DOI: 10.1590/1980-5373-MR-2015-0786 -
Hydroxyl (O-H) öryggi 1,0
“3300-3400 -OH stretch ± ± 3391 26.1 0.3 3266 9.3 0.1 ± ± 2920 12.8 0.1 2921 9.1 0.1 -CH 2asymmetric stretch”
Grape Canes (Vitis vinifera L.) Applications on Packaging and Particleboard Industry: New Bioadhesive Based on Grape Extracts and Citric Acid DOI: 10.3390/polym14061137 -
Hydroxyl (O-H) öryggi 0,9
“Peak at 3391 cm-1 corresponds to -OH stretch.”
Arla 等 - 2018 - CHARACTERIZATION AND QUANTIFICATION OF ETHYLHEXYLG DOI: 10.13040/IJPSR.0975-8232.9(4).1660-65 -
Hydroxyl (O-H) öryggi 0,8
“Absorption at 3391 cm-1 attributed to OH groups.”
Li 等 - 2020 - Solvent-free synthesis of 1-amidoalkyl-2-naphthol DOI: 10.2478/pjct-2020-0012
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