What absorbs at 1722 cm⁻¹ in an FTIR spectrum?
A band near 1722 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 1722 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 |
|---|---|---|---|
| Carbonyl (C=O) | 34 | 28 | 1,0 |
| Carboxyl (COOH) | 27 | 26 | 1,0 |
| Methacrylate | 22 | 21 | 1,0 |
| Acetate | 22 | 21 | 1,0 |
| Ester | 22 | 20 | 1,0 |
| Amide | 20 | 19 | 1,0 |
| Ketone | 19 | 18 | 1,0 |
| Alkyl C-H | 12 | 11 | 1,0 |
| C-O single bond | 6 | 6 | 1,0 |
| Hydroxyl (O-H) | 5 | 5 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| Imide | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Aldehyde (CHO) | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
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 |
|---|---|---|---|
| bacterial cellulose | 1722, 1050, 1631 | Methacrylate, Acetate, Carbonyl (C=O) | 1 |
| polymer | 1722, 1718, 1664 | Methacrylate, Acetate, Carboxyl (COOH) | 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 1722 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
“The test cm-1 1722 peak is assigned the n(C=O) groups, at the”
Bakan 等 - 2019 - Synthesis, characterization, toxicity and in vivo DOI: 10.1007/s10965-019-1901-7 -
Imide încredere 1,0
“All band at position 1722 these changes may be due to the partial destruction at the imide and aromatic sites and carbonization of the implanted layer of Kapton-H.”
Chhokkar 等 - 2020 - Electrical and Structural Characterization of 100 DOI: 10.1063/5.0023335 -
Carboxyl (COOH) încredere 1,0
“Upon bubbling CO 2, a new which was considered as a critical parameter to be taken into 2 cm-1 peak centered at 1722 assigned to the symmetric stretching consideration as a result of proton shuttling phenomenon to form for the COO moiety of”
Eftaiha 等 - 2017 - Bis-tris propane in DMSO as a wet scrubbing agent DOI: 10.1039/C7NJ02130E. -
Acetate încredere 1,0
“A band due to free esters and acids C=O stretch are observed at 1722.43 and 1728.22”
Firsoni 等 - 2019 - Fiber Content and Relative Feed Value Estimation o DOI: 10.1088/1757-899X/546/4/042008 -
Ester încredere 1,0
“A peak was also observed at 1722 for JF and AJF that may attribute to ester-based compounds that could have been used by supplier in the”
In-situ Production and Collection of Bacterial Cellulose on Jute and Flax Mats by Static Cultivation DOI: 10.1080/15440478.2020.1870638 -
Acetate încredere 1,0
“Another solution and then adjusted to each predescribed pH with 1 N sodium to minor peak at 1722 cm-' due the C=O stretching band of hydroxide (NaOH) or M hydrogen chloride (HCl) aqueous solution to 6”
Vibrational Spectroscopic Studies on the Disulfide Formation and Secondary Conformational Changes of Captopril–HSA Mixture after UV-B Irradiation DOI: 10.1562/2005-04-25-RN-497 -
Carbonyl (C=O) încredere 1,0
“cm-1 ∼1722 band relative to those due to carbonyl groups at suggests that SOZ may, in fact, be the major reaction product.”
McIntire 等 - 2009 - Secondary Ozonide Formation from the Ozone Oxidati DOI: 10.1021/jp901535t -
Acetate încredere 1,0
“However, for NIP, the C=O peak was at 1722 and the 226 cm-1.”
Synthesis, characterization, and application of β-cyclodextrin-based ion-imprinted polymer for selective sequestration of Cr(VI) ions from aqueous media: Kinetics and isotherm studies DOI: 10.1016/j.molliq.2019.111991
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