What absorbs at 1204 cm⁻¹ in an FTIR spectrum?
A band near 1204 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 1204 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 |
|---|---|---|---|
| C-O single bond | 8 | 7 | 1,0 |
| Methoxy (OCH3) | 6 | 5 | 1,0 |
| Methacrylate | 6 | 5 | 1,0 |
| Acetate | 6 | 5 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Protein | 3 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Fluorine (C-F) | 2 | 2 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
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 1204 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
“C-O stretching vibration C-F 1204, 1148 1203, 1149 C-F stretching PFOA-modified”
Ganie 等 - 2020 - Synthesis and Characterization of a New Surface-Mo DOI: 10.1155/2020/8814260 -
C-O single bond încredere 1,0
“The peaks at 1204 and 1036 Figure 3) was considered to arise from many 0% RH belonged to C-OH in plane bending types of adsorbed water.”
Characterizing molecular structure of water adsorbed by cellulose nanofiber film using in situ micro-ftir spectroscopy DOI: 10.1080/02773813.2017.1306078 -
Alkyl C-H încredere 1,0
“O iment showed that during this degradation step, the bromine A articles groups of the polymer end functionalities are eliminated, and cm-1 the peaks at 1204 and 1164 correspond to the CH wagare governed ging vibrations of CH 3Br.”
Aliyev 等 - 2020 - SI-ATRP Polymer-Functionalized Graphene Oxide for DOI: 10.1002/admi.202000443. -
Amide încredere 1,0
“Its presence interferes with the detection of the Amide III series of bands (1337, 1284, 1240 cm-1) and 1204 cm-1) but these would not be prominent in the perpendicular orientation.”
Orientation Matters: Polarization Dependent IR Spectroscopy of Collagen from Intact Tendon Down to the Single Fibril Level DOI: 10.3390/molecules25184295 -
încredere 1,0
“Mcintosh et al.[7] had shown that the absorbance bands assigned to collagen (1035, 1080, 1204, cm-1) 1240, 1280, and 1330 were only observed in the dermis.”
Hammody 等 - 2005 - Characterization of malignant melanoma using vibra DOI: 10.1100/tsw.2005.1 -
Hydrogen bond încredere 1,0
“electronic ground state were largely identical and gave limited Immediately after photoexcitation (Figure 2b, black line), information on the prevailing hydrogen bond patterns in these strong peaks appeared at 1204, 1258, 1284, 1349, 1386,”
Spectroscopic and Computational Observation of Glutamine Tautomerization in the Blue Light Sensing Using Flavin Domain Photoreaction DOI: 10.1021/jacs.2c10621 -
Hydroxyl (O-H) încredere 1,0
“The C-O stretching and C-C stretching was detected at 1440 [27], cm-1 cm-1 C-N stretching at 1340 [21] and C-O stretching or O-H bending at 1204 [27].”
Discrimination of Syzygium samarangense cv. ‘Giant Green’ Leaves at Different Maturity Stages by FTIR and GCMS Fingerprinting DOI: 10.3390/horticulturae9050609 -
C-O single bond încredere 1,0
“The very cm-1 wavenumbers correspond to C-F stretching vibrations of the PTFE strong absorption bands near 1144 and 1204 cm-1 are assigned to the symmetric vibrations of two ether backbone in Nafion.”
Irmawati 等 - 2016 - Polarization Losses Under Dynamic Load Cycle Using DOI: 10.1063/1.4941635
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