What absorbs at 2120 cm⁻¹ in an FTIR spectrum?
A band near 2120 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
Schnelle Antwort
A band near 2120 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Silicon hydride | 4 | 3 | 1,0 |
| C#c | 3 | 3 | 1,0 |
| N h | 2 | 1 | 1,0 |
| Silicon (Si) | 2 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 1 | 1,0 |
| Secondary amine | 1 | 0 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Spektrumslogik
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 2120 cm⁻¹ is usually not enough for material identification by itself.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
Adsorbed carbon monoxide Vertrauen 1,0
“over Pt/SiO 2 Otherauthors,however,eitherhavenotobservedapeak The oxidation of carbon monoxide is one of the most incm¡1 at all (1, 12) or have not observed the peak to at 2120 tensely studied reactions in the history of catalysis.”
Fanson 等 - 2001 - Island formation during kinetic rate oscillations DOI: 10.1006/jcat.2001.3369 -
Boron nitrogen Vertrauen 1,0
“=𝜇(1282cm-1)/𝜇(2120cm-1) × 5.5 × 16.5, out h-BN additive displayed typical yellow due to the 𝜇(1130cm-1), 𝜇(1282cm-1) 𝜇(2120cm-1) involvement of nitrogen impurities, which is inevitable where and 2120cm-1, in the synthesis cell.”
B–C Bond in Diamond Single Crystal Synthesized with h-BN Additive at High Pressure and High Temperature DOI: 10.1088/0256-307X/33/2/028101 -
Silicon (Si) Vertrauen 1,0
“The 3 USC cm-1 absorption at around 2120 is always assigned to Si-H stretching vibrations.”
Peter 等 - 2013 - FTIR analysis of a-SiCNH films deposited by PECVD DOI: 10.1016/j.vacuum.2013.04.014 -
Ester Vertrauen 1,0
“diesel treated wastewater shifted to 2120.26 This peak shift denotes the dilution and electron transfer effect of methyl ester in biodiesel to pure distilled water.”
Chemometric analysis of cow dung ash as an adsorbent for purifying biodiesel from waste cooking oil DOI: 10.1038/s41598-017-09881-z -
Silicon hydride Vertrauen 1,0
“Explicit assignment: 'absorption peak at 2,120 corresponds to Si-H'”
Chen 等 - 2021 - Synthesis of a novel UV-curable prepolymer 1,3-bis DOI: 10.2478/msp-2021-0030 -
Vertrauen 1,0
“In the presence of L-Arg, the ν CO cm-1, positive partial charge, most likely the neutral terminal amino group absorption bands are centered on 2120 and 2131 and there are cm-1.”
Horn 等 - 2014 - Fourier transform infrared spectroscopy study ofli DOI: 10.12688/f1000research.5836.1 -
C#c Vertrauen 1,0
“Finally, the peaks at 2120 cm-1 that can be observed in the FTIR spectra of BC, HBC, and HBC/nZVI corresponded to the C≡C bonds in the Materials2022,15,6055 7of16 biochars [28].”
Biochar Nanocomposite as an Inexpensive and Highly Efficient Carbonaceous Adsorbent for Hexavalent Chromium Removal DOI: 10.3390/ma15176055 -
C#c Vertrauen 1,0
“LLM confirmed rule peak-group candidate”
Phelan 等 - 2020 - Tracking glycosylation in live cells using FTIR sp DOI: 10.1016/j.talanta.2020.120737
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