What absorbs at 1213 cm⁻¹ in an FTIR spectrum?
A band near 1213 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 1213 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 |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 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 |
|---|---|---|---|
| polyurethane | 1213, 2270, 1700 | Methacrylate, Acetate, C-O single bond | 1 |
| polyester | 1213, 1700, 1250 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| TiO2 | 1213, 1700, 1093 | Methacrylate, Acetate, C-O single bond | 1 |
| soil | 1213, 575, 1240 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polyaniline | 1213, 1565, 1570 | Methacrylate, Acetate | 1 |
| TiO2 nanoparticles | 1213, 1700, 455 | Methacrylate, C-O single bond, 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 1213 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
-
Alkyl C-H affidabilità 1,0
“cm-1 and 1635 due to stretching vibrations of O-H group, the bands assigned at 3275 cmcm-1, - 1 the band at 2922 due to vibrations of C H stretching thee band at 1213 1062cm-1,482cm-1,576cm-1,1535cm-1arethefollowingvibrationsC-Ostretching,N”
Bio-engineered TiO2 nanoparticles using Ledebouria revoluta extract: Larvicidal, histopathological, antibacterial and anticancer activity DOI: 10.1080/03067319.2020.1718668 -
Silicon (Si) affidabilità 1,0
“While the absorption bands at wave numbers 1060.88 and 1213.27 cm-1 show the Si-O-Si asymmetrical vibrations.”
Synthesis and catalytic activity of mesoporous Al-MCM-41/UiO-66 for esterification of oleic acid DOI: 10.1063/1.5082500 -
Acetate affidabilità 1,0
“attached to the aromatic graphene network at 1409 the C-O (hydroxyl) stretching at 1601 cm-1 cm-1 the C-O (epoxy) stretching at 1040 and the C-O (phenolic) stretching at 1213 [18,30].”
Preparation of Electrospun Nanocomposite Nanofibers of Polyaniline/Poly(methyl methacrylate) with Amino-Functionalized Graphene DOI: 10.3390/polym9090453 -
Alkyl C-H affidabilità 1,0
“2 the dyslipidemic effect was dependent on the concentration L cm-1 ibrary and the CH asymmetric stretching band at 1213 2 of the statin used.”
Comparison of the Effects of Statins on A549 Nonsmall‐Cell Lung Cancer Cell Line Lipids Using Fourier Transform Infrared Spectroscopy: Rosuvastatin Stands Out DOI: 10.1002/lipd.12296 -
Acetate affidabilità 1,0
“Polymers 2023, 15, x FOR PEER REVIEW 12 of 15 1583 Aromaticringsvibration 1213 C-O/C-O-Cstretchingvibration”
Enhancing Char Formation and Flame Retardancy of Ethylene-Vinyl Acetate Copolymer (EVA)/Aluminum Hydroxide (ATH) Composites by Grafting Ladder Phenyl/Vinyl Polysilsesquioxane (PhVPOSS) DOI: 10.3390/polym15153312 -
Amide affidabilità 1,0
“1213 (stretching modes of C-N bonds);”
ATR-FTIR Analysis of Orthodontic Invisalign® Aligners Subjected to Various In Vitro Aging Treatments DOI: 10.3390/ma14040818 -
Carbohydrate affidabilità 1,0
“The peak at 1213 signifies hemicellulose vibration.”
Shafiquzzaman 等 - 2022 - Sawdust Recycling in the Development of Permeable DOI: 10.3390/su141811115 -
Acetate affidabilità 1,0
“A band at 1213 cm-1 belonged to the syringyl ring and C-O stretch in In the FTIR spectra of all samples studied, there are characteristic absorption bands of the aliphatic C-H bond at 2940 cm-1 and (less pronounced) at 2840 cm-1.”
Formation of Humic-Like Substances during the Technological Process of Lignohumate® Synthesis as a Function of Time DOI: 10.3390/separations8070096
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