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
Quick answer
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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| 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 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Spectrum logic
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.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatūra aiz šiem piešķīrumiem
-
Adsorbed carbon monoxide pārliecība 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 pārliecība 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) pārliecība 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 pārliecība 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 pārliecība 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 -
pārliecība 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 pārliecība 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 pārliecība 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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