What absorbs at 2021 cm⁻¹ in an FTIR spectrum?
A band near 2021 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 2021 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 |
|---|---|---|---|
| Methacrylate | 10 | 10 | 1,0 |
| Acetate | 10 | 10 | 1,0 |
| Amide | 10 | 10 | 1,0 |
| C-O single bond | 8 | 8 | 1,0 |
| Methoxy (OCH3) | 7 | 7 | 1,0 |
| Alkyl C-H | 7 | 7 | 1,0 |
| Hydroxyl (O-H) | 6 | 6 | 1,0 |
| Carboxyl (COOH) | 5 | 5 | 1,0 |
| Carbonyl (C=O) | 5 | 5 | 1,0 |
| Secondary amine | 4 | 4 | 1,0 |
| C n single bond | 4 | 4 | 1,0 |
| Ketone | 3 | 3 | 1,0 |
| Ester | 3 | 3 | 1,0 |
| Hydrogen bond | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Metal carbon | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Amino acid | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 0 | 0,7 |
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 |
|---|---|---|---|
| PVP | 2021, 2983, 1648 | Amide, Methacrylate, Acetate | 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 2021 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
-
Amide affidabilità 1,0
“These lines overlap, forming the amide I band, Molecules 2021, 26, 1174 4 of 14”
A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules -
Hydroxyl (O-H) affidabilità 1,0
“Variation of asymmetry and symmetry stretching and Media, LLC, part of Springer (NH4?) vibration of cation were investigated by deconvoluted peak of FTIR in Nature 2021 absorbance mode at O-H region and area of deconvoluted peaks in C-O reg”
Investigations of biodegradable polymer blend electrolytes based on Cornstarch: PVP: NH4Cl and its potential application in solid-state batteries DOI: 10.1007/s10854-021-05266-1 -
Hydroxyl (O-H) affidabilità 1,0
“4000-2500 Single bond Hydroxyl (O-H) Stretching (2021) Amine (N-H) New Used Ordinary Fly Bottom Aldehyde (C-H) (C≡C) 2500-2000”
Physicochemical properties of absorbent hydrogel polymers in disposable baby diapers DOI: 10.1016/j.cplett.2021.138605 -
C-O single bond affidabilità 1,0
“C-C-O stretch HEMA 880 C-C-O stretch Ethanol Polymers2021,13,3886”
Determination of Dental Adhesive Composition throughout Solvent Drying and Polymerization Using ATR–FTIR Spectroscopy DOI: 10.3390/polym13223886 -
C-O single bond affidabilità 1,0
“Sci.2021,11,5065 11of15 vibrations, C-OH bending deformation, C-H bond stretching and C=O and C=C groups)”
Characterization of a Spirit Beverage Produced with Strawberry Tree (Arbutus unedo L.) Fruit and Aged with Oak Wood at Laboratorial Scale DOI: 10.3390/app11115065 -
affidabilità 1,0
“It has generally been shown that the intensities of the peaks Molecules 2021, 26, x FOR PEER REVIEW 9 of 18 are attributed to oxygen vacancies within the nanostructures;”
Influence of the Alcoholic/Ethanolic Extract of Mangifera indica Residues on the Green Synthesis of FeO Nanoparticles and Their Application for the Remediation of Agricultural Soils DOI: 10.3390/molecules26247633 -
Alkyl C-H affidabilità 1,0
“O-H stretching 1005 C-H bending 829 C-H stretching Foods2021,10,1848”
Quantification of the Geranium Essential Oil, Palmarosa Essential Oil and Phenylethyl Alcohol in Rosa damascena Essential Oil Using ATR-FTIR Spectroscopy Combined with Chemometrics DOI: 10.3390/foods10081848 -
C-S single bond affidabilità 1,0
“positions and new bands at 870 (O-C-S stretching), cm-1 The evolution of most gaseous species ceased by the end and 2021 (S-C = O stretching) likely indicates the for-”
Thermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III)—a single-source precursor for antimony sulfide thin films DOI: 10.1007/s10973-021-10885-1
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