What absorbs at 1177 cm⁻¹ in an FTIR spectrum?
A band near 1177 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 1177 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 |
|---|---|---|---|
| Fluorine (C-F) | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| S eq 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 |
|---|---|---|---|
| cotton | 1177, 1030, 1638 | Methacrylate, C-O single bond, Methoxy (OCH3) | 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 1177 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
-
Fluorine (C-F) încredere 1,0
“On the which can be attributable to and stretching viν other hand, brationalmodes,respectively, in 70wt.%PVdF-HFP-30 wt.%LiCF a(CF 2) band originating from PVdF-HFP was found at 3SO 3, 1176cm-1,1177 cm-1and1178cm-1inS30,6ECand6PCsamples.”
Characteristics of PEMA/PVdF-HFP blend polymeric gel films incorporated with lithium triflate salt in electrochromic device DOI: 10.1016/j.ssi.2011.11.035 -
Phosphate (PO4) încredere 1,0
“The P=O stretching at 1177 and 1184”
Verma 等 - 2018 - Structural investigations on uranium(VI) and thori DOI: 10.1039/C7NJ04460G. -
Alkyl C-H încredere 1,0
“The main absorption peaks were cm-1, Additionally, some additional peaks were recorded at 1454 and 1381 due to the asymmetric observed at 3020 and 2943 cm-1, 1743 cm-1 and 1177 cm-1 due to CH stretching of methyl and methylene cm-1 and symm”
Eleftheriadou 等 - 2020 - Development of Novel Polymer Supported Nanocomposi DOI: 10.3390/app10072368 -
Ester încredere 1,0
“However, it is very difficult to determine the degree of esterification due to the presence Materials2022,15,470 8of13 and 1177 cm-1, a peak is formed of ester bonds in the polyester.”
Grgac 等 - 2022 - The Effect of Ultrasonic Treatment on the Binding DOI: 10.3390/ma15020470 -
încredere 1,0
“Moreover, asymmetric S O stretching 2 cm-1, cm-1, = at 1355 and symmetric S O stretching at 1177 were observed in the FTIR spectra 2 of tosylated cellulose, which confirmed the tosylation reaction.”
A Composite Anion Conducting Membrane Based on Quaternized Cellulose and Poly(Phenylene Oxide) for Alkaline Fuel Cell Applications DOI: 10.3390/polym12112676 -
Acetate încredere 1,0
“cm-1 1177 C-O-C stretch bands were found near 1016 The band near 754 work [25].”
Tannic Acid-Loaded Hydroxyapatite Carriers for Corrosion Protection of Polyolefin-Coated Carbon Steel DOI: 10.3390/app122010263 -
Fluorine (C-F) încredere 1,0
“cm-1 Similarly, this shifting exists in the new band displayed as a broad band at 1177 cm-1 v within the first 50 s that grows and stabilizes at 1170 corresponding to the s(CF 2) +”
Torres-Rodriguez 等 - 2022 - Polyvinylidene Fluoride Aerogels with Tailorable C DOI: 10.3390/gels8110727 -
încredere 0,9
“Absorbance band at about 1177 cm-1 (C-O).”
Volatile out gassing characteristics of highly filled ethylene vinyl acetate binder materials: Gas phase infra-red spectroscopy DOI: 10.1016/j.polymertesting.2012.12.001
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