What absorbs at 1900 cm⁻¹ in an FTIR spectrum?
A band near 1900 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 8 cited sources
Schnelle Antwort
A band near 1900 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Adsorbed carbon monoxide | 4 | 3 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| N-O bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| C-O single bond | 2 | 1 | 1,0 |
| Water (H2O) | 2 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Mögliche Materialien
| Material | Unterstützende Peaks | Überlappende Gruppen | Zitierte Quellen |
|---|---|---|---|
| biodiesel | 1900, 858, 3470 | Alkyl C-H, Carbonyl (C=O) | 1 |
Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.
Spektrumslogik
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 1900 cm⁻¹ is usually not enough for material identification by itself.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
N-O bond Vertrauen 1,0
“Taking into - account the results on CO adsorption and literature data [69-74], 1770cm(cid:2)1 Cr3+(NO) are assigned to the bands at 1900 and”
Influence of dealumination and treatments on the chromium speciation in zeolite CrBEA DOI: 10.1016/j.micromeso.2009.04.038 -
Water (H2O) Vertrauen 1,0
“The most striking feature in the infrared cm(cid:3)1, the oxalic acid dihydrates and the perfluorocarboxylic acid monospectrum of OXAD is the rather strong absorption near 1900 OAH(cid:1)(cid:1)(cid:1)O hydrates in the regions characteristi”
Infrared spectra of hydrogen bond network in lamellar perfluorocarboxylic acid monohydrates DOI: 10.1016/j.saa.2021.119551 -
Adsorbed carbon monoxide Vertrauen 1,0
“However, assignment to ketene cannot and Possible Photoproducts be unequivocal in this spectral region, since carbon monoxide frequencies.27 also absorbs at the same cm-1 The absorptions above 1900 are characteristic of”
Jarmelo 等 - 2008 - Matrix-Isolated Diglycolic Anhydride Vibrational DOI: 10.1021/jp805603b -
Vertrauen 1,0
“The band at about 1900 can be assigned to three-coordinated CO on Pd(111) or bridged CO on (100) planes.”
Facile Redox Synthesis of Novel Bimetallic Crn+/Pd0 Nanoparticles Supported on SiO2 and TiO2 for Catalytic Selective Hydrogenation with Molecular Hydrogen DOI: 10.3390/catal11050583 -
Ester Vertrauen 1,0
“coefficients.42 cm-1) and discuss the loadings or regression Citing (two points: 1900 and 1560 and the area under the Bro:43 cm-1) Kjeldahl and "…we looked at a number of commonly ester C=O stretching band (1900-1728 was calculated occurrin”
Kollar 等 - 2017 - Nuclear Magnetic Resonance (1.40 T) and Mid Infrar DOI: 10.21577/0103-5053.20170031 -
Acetate Vertrauen 1,0
“In the region 1402-1457 bands due to in which the bands due to the formation of imines in the area carbohydrates, glycoproteins, lipids and their characteristic cm-1, between 1900 and 1600 and the bands related to the C-O-H in-plane bending”
Mura 等 - 2012 - FTIR nanobiosensors for Escherichia coli detection DOI: 10.3762/bjnano.3.55 -
Hydroxyl (O-H) Vertrauen 1,0
“t absorption bands below 1900 The signals do match reasonably well with a mixture of h o CO-loss isomers from the parent 1-1 isomer shown in Figure 10b.”
Photodynamics of [FeFe]-Hydrogenase Model Compounds with Bidentate Heterocyclic Ligands DOI: 10.1021/acs.jpcb.9b04675. -
Adsorbed carbon monoxide Vertrauen 1,0
“cm-1 Figure 3A shows that the absorption bands exist at 1750 - 1850 and 1900 cm-1, - 2100 which may be ascribed to bridge type and linear type of CO adsorbed on”
In situ FTIR study on the formation and adsorption of CO on alumina-supported noble metal catalysts from H2 and CO2 in the presence of water vapor at high pressures DOI: 10.1039/c2cp23590k
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