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
Risposta rapida
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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| 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 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Materiali possibili
| Materiale | Picchi di supporto | Gruppi sovrapposti | Fonti citate |
|---|---|---|---|
| biodiesel | 1900, 858, 3470 | Alkyl C-H, Carbonyl (C=O) | 1 |
I materiali vengono mostrati solo quando lo stesso pool di letteratura supporta questa banda e almeno un picco caratteristico aggiuntivo.
Logica dello spettro
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.
Utilizzo nel mondo reale
Questo tipo di richiesta è comune nell＇identificazione dei polimeri, nello screening di plastiche sconosciute, nella risoluzione dei problemi di controllo qualità, nella verifica dei materiali riciclati e nella revisione dell＇assegnazione dei picchi supportata dalla letteratura.
Errori comuni
- Trattare una banda isolata come prova di un materiale senza verificare almeno uno o due picchi di supporto.
- Ignorando la sovrapposizione: più gruppi funzionali possono contribuire vicino allo stesso numero d＇onda.
- Saltare la convalida quando additivi, miscele, ossidazione o contaminazione possono distorcere lo spettro.
Consiglio di verifica
Quando permangono ambiguità, convalida l＇ipotesi con DSC, GC-MS o TGA, specialmente per miscele, campioni degradati e polimeri caricati.
Letteratura dietro queste assegnazioni
-
N-O bond affidabilità 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) affidabilità 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 affidabilità 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 -
affidabilità 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 affidabilità 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 affidabilità 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) affidabilità 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 affidabilità 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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