What absorbs at 2357 cm⁻¹ in an FTIR spectrum?
A band near 2357 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
Snabbt svar
A band near 2357 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.
Möjliga identifieringar av funktionella grupper
| Funktionell grupp | Stödjande fakta | Citerade källor | Högsta förtroende |
|---|---|---|---|
| Carbon dioxide | 4 | 4 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 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 |
| Protein | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 0,9 |
Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.
Möjliga material
| Material | Stödjande toppar | Överlappande grupper | Citerade källor |
|---|---|---|---|
| AgNPs | 2357, 1232, 1048 | N h, Methoxy (OCH3) | 1 |
Material visas endast när samma litteraturpool stöder detta band och minst en ytterligare karakteristisk topp.
Spektrumlogik
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 2357 cm⁻¹ is usually not enough for material identification by itself.
Användning i verkligheten
Denna typ av fråga är vanlig inom polymeridentifiering, screening av okänd plast, felsökning av kvalitetskontroll, verifiering av återvunnet material och litteraturstödd toppidentifieringsgranskning.
Vanliga misstag
- Behandla ett isolerat band som bevis på ett material utan att kontrollera minst en eller två stödjande toppar.
- Ignorerar överlapp: flera funktionella grupper kan bidra nära samma vågtal.
- Hoppa över validering när tillsatser, blandningar, oxidation eller föroreningar kan förvränga spektrat.
Verifieringsråd
När oklarhet kvarstår, validera hypotesen med DSC, GC-MS eller TGA, särskilt för blandningar, nedbrutna prover och fyllda polymerer.
Litteratur bakom dessa identifieringar
-
Hydroxyl (O-H) förtroende 1,0
“[41] where phytocatalytic synthesis of AgNPs using Synsepalum dulcificum showed a prominent peak at cm-1 2357 and 1641 which revealed the involvement of phenolic compounds and proteins.”
Kumar 等 - 2017 - Photo-induced and phytomediated synthesis of silve DOI: 10.1016/j.jphotobiol.2017.04.022 -
Acetate förtroende 1,0
“stretching vibration bands of imidazolium ring appeared at 2357 The active C-O stretching cm-1 vibration band appears at 1461 and corresponding C-O bending vibration peak is observed cm-1.”
Ionic liquid mediated morphologically improved lanthanum oxide nanoparticles by Andrographis paniculata leaves extract and its biomedical applications DOI: 10.1016/j.jre.2019.06.006 -
Carbon dioxide förtroende 1,0
“Medium stretching O=C=O 2357 Carbon dioxide Strong stretching C-H 2889 Alkane Medium stretching N-H 3325 Aliphatic primary amine”
Development and characterization of natural sourced bioplastic for food packaging applications DOI: 10.1016/j.heliyon.2023.e13538 -
Carbon dioxide förtroende 1,0
“9 TG and corresponding DTG curves for poly(TRIM) and 4VPTRIM microspheres obtained in air atmosphere are water (bands in the region of 3,700-3,600 and cm-1) 1,600-1,400 and carbon dioxide (peaks at 2357, cm-1) 2311 and 670 [18, 19].”
Grochowicz - 2014 - Investigation of the thermal behavior of 4-vinylpy DOI: 10.1007/s10973-014-4066-y -
Ammonium förtroende 1,0
“Anotherpeakaround2356.8330cm-1 cm-1 to 2379.7074 was observed in all the spectra except PGG which was possibly due to cm-1 ammonium ions (N-H).”
Hydrolysis, Microstructural Profiling and Utilization of Cyamopsis tetragonoloba in Yoghurt DOI: 10.3390/fermentation9010045 -
Carbon dioxide förtroende 1,0
“evolution of carbon dioxide (peaks at 2357, 2311 and Figure 12 presents the Gram-Schmidt plots obtained cm-1) 670 during the thermal decomposition of the parent and carbon monoxide (peaks at 2174,”
Synthesis and thermal properties of parent and modified DMN–co-GMA copolymers DOI: 10.1007/s10973-018-7162-6 -
Silicon-oxygen (Si-O) förtroende 0,9
“Same sentence as peak 687, attributed to Si-O bonds.”
Huseynov 等 - 2018 - Fourier transform infrared spectroscopic study of DOI: 10.1142/S0217979218500741 -
förtroende 0,9
“Explicit assignment in text.”
Samra 和 Athar - 2009 - Novel Synthesis of Mannosamine Conjugated Magnetic DOI: 10.1007/s12257-008-0314-y
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