What absorbs at 2116 cm⁻¹ in an FTIR spectrum?
A band near 2116 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 6 cited sources
Quick answer
A band near 2116 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.
可能性のある官能基アサイン
| 官能基 | 裏付け事実 | 引用元 | 最高信頼度 |
|---|---|---|---|
| Silicon hydride | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| C#c | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 0.8 |
ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。
Possible materials
| 素材 | 補助ピーク | Overlapping groups | 引用元 |
|---|---|---|---|
| cellulose acetate | 2116, 1650, 1741 | Alkyl C-H | 1 |
| calcite | 2116, 2850, 2864 | Alkyl C-H | 1 |
| quartz | 2116, 800, 3053 | Alkyl C-H, Silicon (Si) | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
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 2116 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.
これらのアサインの根拠となる文献
-
C#c 信頼度 1.0
“The alkyne peak at 2116 cm-1 was small for FTIR, even at high concentrations of the alkyne group”
Biotin-Conjugated Cellulose Nanofibers Prepared via Copper-Catalyzed Alkyne-Azide Cycloaddition (CuAAC) “Click” Chemistry DOI: 10.3390/nano10061172 -
Alkyl C-H 信頼度 1.0
“C≡O CO Stretching 2181 and 2116 cm-1 Alkyl groups C-H Stretching 3000-2800 cm-1 Carboxylic acids”
Pyrolysis and Volatile Evolution Behaviors of Cold-Rolling Oily Sludge DOI: 10.3390/pr10030543 -
Silicon (Si) 信頼度 1.0
“cm-1 1402 The strong absorption band observed at 2116 can be assigned to Si-H cm-1, vibration.”
Porous Silicon Oxycarbonitride Ceramics with Palladium and Pd2Si Nanoparticles for Dry Reforming of Methane DOI: 10.3390/polym14173470 -
信頼度 0.9
“Same as above.”
Hu 等 - 2021 - In situ FTIR and ex situ XPSHS-LEIS study of supp DOI: 10.1016/S1872-2067(20)63672-5 -
信頼度 0.9
“Explicitly stated: 'potassium ferricyanide band at 2116'”
Jorda 等 - 2022 - Characterisation of clays from Alicante province ( DOI: 10.1007/s10653-021-00925-y -
Nitro (NO2) 信頼度 0.8
“Characteristic peak for -NO2 substitution.”
Hegde 等 - 2018 - Synthesis and Antimicrobial Screening of Pyrimidin DOI: 10.5012/jkcs.2018.62.2.87
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