What absorbs at 1219 cm⁻¹ in an FTIR spectrum?
A band near 1219 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
Răspuns rapid
A band near 1219 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Methacrylate | 7 | 6 | 1,0 |
| Acetate | 7 | 6 | 1,0 |
| Methoxy (OCH3) | 6 | 5 | 1,0 |
| C-O single bond | 6 | 5 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 0,9 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Materiale posibile
| Material | Vârfuri suport | Grupuri suprapuse | Surse citate |
|---|---|---|---|
| TiO2 | 1219, 1700, 1093 | Methacrylate, Acetate, C-O single bond | 1 |
| kraft lignin | 1219, 1744, 1710 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| PMMA | 1219, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| ZnO nanoparticles | 1219, 1726, 1568 | Methacrylate, Acetate, C-O single bond | 1 |
Materialele sunt afișate numai atunci când același grup de literatură susține această bandă și cel puțin un vârf caracteristic suplimentar.
Logica spectrului
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 1219 cm⁻¹ is usually not enough for material identification by itself.
Utilizare în condiții reale
Acest tip de interogare este comun în identificarea polimerilor, screeningul materialelor plastice necunoscute, depanarea QC, verificarea materialelor reciclate și revizuirea atribuirii vârfurilor bazată pe literatură.
Greșeli comune
- Tratarea unei benzi izolate ca dovadă a unui material fără a verifica cel puțin unul sau două vârfuri de susținere.
- Ignorând suprapunerea: mai multe grupuri funcționale pot contribui în apropierea aceluiași număr de undă.
- Omiterea validării atunci când aditivii, amestecurile, oxidarea sau contaminarea pot distorsiona spectrul.
Sfat de verificare
Când ambiguitatea rămâne, validați ipoteza prin DSC, GC-MS sau TGA, în special pentru amestecuri, probe degradate și polimeri umpluți.
Literatura din spatele acestor atribuiri
-
Acetate încredere 1,0
“characteristics ester carbonyl C=O stretch vibration of PMMA was also appeared at 1766 cm-1, cm-1 The stretching modes were detected at 1219 and 703 assigned to C-O and C=O bonds, respectively.”
Carrier mechanism of ZnO nanoparticles-embedded PMMA nanocomposite organic bistable memory device DOI: 10.1016/j.solidstatesciences.2019.106046 -
încredere 1,0
“Bands depicting amide II were found at 1517, cm-1, 1586, 1514, and 1522 whereas amide III bands were registered at 1221, 1219, 1227, cm-1 and 1229 for all tested protocol extracts (P1, P2, P3, and P4 respectively) (Figure 3B).”
Comparison of Different Methods for Spongin-like Collagen Extraction from Marine Sponges (Chondrilla caribensis and Aplysina fulva): Physicochemical Properties and In Vitro Biological Analysis DOI: 10.3390/membranes11070522 -
Ring structure încredere 1,0
“The former one (peak D) can be ing, bond at 1219 assigned to the ring vibrations is obascribed to the C=O bonds pertaining to carboxylic groups, served for samples EG and EG-3Ph reg but not for EG-3Ph.”
Regeneration of expanded graphite electrodes by joined electrochemical and ozone treatment in liquid phase DOI: 10.1007/s10008-018-4098-5 -
Amide încredere 1,0
“Shore A hardness cm-1 (C-O (cis-) bending (rocking)), 1105 (aliphatic saturated cm-1 (C-N CvO Hardness of HMA7 was measured with a handheld Precision ether)), 1282 (secondary amide, III) + (carbocm-1 (C-N Instrument Shore A digital duromete”
Bhullar 等 - 2021 - Advanced spectroscopy, microscopy, diffraction and DOI: 10.1039/d0py01348j -
S eq o încredere 1,0
“The absorptions at 1219, decreases, making the more tortuous path by ethanol due cm-1 1076, and 1020 were assigned to the sulfonic acid to inorganic phase presence and possible TiO particles”
Dutra Filho 等 - 2014 - Nanostructured Polyelectrolytes Based on SPEEKTiO DOI: 10.4322/polimeros.2014.069 -
Hydroxyl (O-H) încredere 1,0
“rR@SrTiO rR@BaTiO (1900 to 900 In contrast, the FTIR spectra of 3-OH-A and 3cm-1, OH-A showed strong absorptions at 1219, 1141, and 1100 and at 1200 and 1091 respectively, due to the presence of H 2SO on the NP surface.”
Freimann 等 - 2023 - Nanoparticulate Perovskites for Photocatalytic Wat DOI: 10.3390/nano13142094 -
Acetate încredere 1,0
“The peak cm-1 at 1219 could be assigned to the C-O stretching in the ether or alcohol groups [38].”
Analysis of Chemical Structure and Antibiofilm Properties of Exopolysaccharides from Lactiplantibacillus plantarum EIR/IF-1 Postbiotics DOI: 10.3390/microorganisms10112200 -
Acetate încredere 1,0
“C-C, C=C (aromatic skeleton), stretching C-C, C=C (aromatic skeleton), stretching 1379 1379 - - 1396 1379 1379 - - 1396 - - - 1271 1270 1272 C-O (guaiacyl unit) stretching - - - 1271 1270 1272 C-O (guaiacyl unit) stretching - - - 1219 1221”
Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials DOI: 10.3390/ijms18061224
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