What absorbs at 2349 cm⁻¹ in an FTIR spectrum?
A band near 2349 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 2349 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.
Возможные назначения функциональных групп
| Функциональная группа | Подтверждающие факты | Цитируемые источники | Максимальная достоверность |
|---|---|---|---|
| Carbon dioxide | 9 | 7 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 0 | 1,0 |
Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.
Possible materials
| Материал | Поддерживающие пики | Overlapping groups | Цитируемые источники |
|---|---|---|---|
| CO | 2349, 1670, 1620 | Methacrylate, Acetate | 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 2349 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.
Литература, лежащая в основе этих назначений
-
Alkyl C-H достоверность 1,0
“proportion.19,30 the concentration in equal Consequently, all the (n (n cm(cid:2)1) cm(cid:2)1) band at 2349 and CH band at 3018 at a bulk 3 4 3 quantitative data will be expressed either in ''ppm m'' or in pressure of 1.2 bar.”
Cailteau 等 - 2011 - In situ gas monitoring in clay rocks mathematical DOI: 10.1039/c0ay00622j -
Carbon dioxide достоверность 1,0
“Inspection of the list of infrared and Raman active modes for gaseous CO (see Table 56 in Herzberg, 1956) shows that carbon dioxide 2 displays, besides a very strong v antisymmetric stretching at 3 cm-1, cm-1, 2349.3 two infrared active ban”
FTIR microspectroscopy and SIMS study of water-poor cordierite from El Hoyazo, Spain: Application to mineral and melt devolatilization DOI: 10.1016/j.lithos.2009.05.031 -
достоверность 1,0
“The band at 2349 was due to O C O stretching concentration increases which may be due to a decrease in oxygen vacancy concentration [44].”
Fabbiyola 等 - 2017 - Optical and magnetic properties of Ni-doped ZnO na DOI: 10.1016/j.jallcom.2016.10.022 -
Carbon dioxide достоверность 1,0
“The band at 2349 was due to O=C=O stretchof dye sensitised solar cells were done using Keithley source ing vibrations which confirms the existence of CO while meter (Model No.”
Structural, optical and electrical properties of Ni doped ZnO nanostructures synthesized by solution combustion method DOI: 10.1007/s10854-017-8038-4 -
Carbon dioxide достоверность 1,0
“Moreover, the presence of 3 2 and 2349 cm-1 caused by the asymmetric stretch ν3 of the CO2 molecule [41].”
Thermal and Plasma-Assisted CO2 Methanation over Ru/Zeolite: A Mechanistic Study Using In-Situ Operando FTIR DOI: 10.3390/catal13030481 -
Carbon dioxide достоверность 1,0
“Results were grouped based on the mass of Carbon dioxide Antisymmetric stretching 2349”
Gordon 和 Sephton - 2016 - Organic Matter Detection on Mars by Pyrolysis-FTIR DOI: 10.1089/ast.2016.1485 -
достоверность 1,0
“Explicit assignment: 'peak located at 2349cm-1 corresponding to the anti-symmetric stretch in carbon dioxide'”
Gordon 和 Sephton - 2018 - A Method for Choosing the Best Samples for Mars Sa DOI: 10.1089/ast.2017.1744 -
Water (H2O) достоверность 1,0
“For carbon dioxide and water the areas of cm-1 corresponding to the anti-symmetric characteristic peaks were recorded - one located at 2349 cm-1 arising from a stretching mode of water.”
Gordon 和 Sephton - 2016 - Rapid habitability assessment of Mars samples by p DOI: 10.1016/j.pss.2015.11.019
Есть спектр с этой полосой?
Загрузите свой FTIR-спектр и получите полный отчет об интерпретации — назначение пиков с цитированием литературы, совпадения с библиотекой и цепочку доказательств с оценкой достоверности — за секунды.