What absorbs at 732 cm⁻¹ in an FTIR spectrum?
A band near 732 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 7 cited sources
Răspuns rapid
A band near 732 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 |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Protein | 1 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 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 |
|---|---|---|---|
| Chitosan | 732, 1650, 1655 | Alkyl C-H | 1 |
| zeolite | 732, 1013, 1245 | Alkyl C-H | 1 |
| microplastics | 732, 1643, 1614 | Alkyl C-H, Aromatic ring | 1 |
| PCL | 732, 1751, 1724 | Alkyl C-H | 1 |
| polyaniline | 732, 1565, 1570 | Aromatic ring, Alkyl C-H | 1 |
| nanocomposites | 732, 1717, 1630 | Alkyl C-H | 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 732 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
-
C-S single bond încredere 1,0
“The weak bands at 732, 634 and cm-1 researchers [48-51] who have also reported that the car570 are due C-S stretching vibration of bonyl groups from amino acid residues or protein strongly dibenzothiophene.”
Green synthesis of bimetallic Pt@Cu nanostructures for catalytic oxidative desulfurization of model oil DOI: 10.1007/s40097-017-0223-8 -
Alkyl C-H încredere 1,0
“The bands that appeared in CeraSeal were similar to those of cm-1, cm-1, cm-1, cm-1 iRoot with bands at 732 874 945 and 1459 showing the presence cm-1 of C-H bending, while the band at 1350 represented S=O stretching.”
Assiry 等 - 2023 - Microstructural and Elemental Characterization of DOI: 10.3390/app13074517 -
Metal oxygen încredere 1,0
“The spectrum of the PANI@TiO2 nanocomposite showed a characteristic band at 732 cm-1, which was attributed to the Ti-O stretching band [35].”
Bekhoukh 等 - 2021 - Development, Investigation, and Comparative Study DOI: 10.3390/polym13193344 -
încredere 1,0
“Pyrolysis Process of MP cm-1 Comparing the pyrolysis of MP with a series of pyrolysis of a single polymer, the 600 K indicated benzene and C-Cl stretching at 732 [31], implying that intermediates such process with interactions and intermedi”
Pyrolysis Process of Mixed Microplastics Using TG-FTIR and TED-GC-MS DOI: 10.3390/polym15010241 -
Protein încredere 1,0
“A small peak detected at 732 that again does not exist in the spectrum of the fibers before protein immobilization corresponds to the amid IV groups amid IV groups of the proteins, which is in line with previously reported results [42,48].”
Hosseini 等 - 2017 - Polymethacrylate Coated Electrospun PHB Fibers as DOI: 10.3390/s17102292 -
Alkyl C-H încredere 1,0
“cm-1, The most intense acridine band, not overlapped with the zeolite bands, at about 732 corresponds to C-H out-of-plane bending vibration, and it is visible in the spectrum of the cm-1 impregnated zeolite sample Acr/Y, but it is shifted b”
Rankovic 等 - 2023 - Can Zeolite-Supporting Acridines Boost Their Antic DOI: 10.3390/jfb14030173 -
Carbonyl (C=O) încredere 0,9
“Explicit assignment: 'peak absorption due to 732 PCL -C=O'.”
Joseph 等 - 2011 - Optimum Blend of Chitosan and Poly-(epsilon-caprol DOI: 10.1007/s11947-009-0203-1
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