What absorbs at 2090 cm⁻¹ in an FTIR spectrum?
A band near 2090 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
Jawapan pantas
A band near 2090 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.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| Hydrogen bond | 2 | 2 | 1.0 |
| Silicon hydride | 2 | 2 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Nitrile | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 1 | 1.0 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Logik spektrum
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 2090 cm⁻¹ is usually not enough for material identification by itself.
Penggunaan dunia sebenar
Jenis pertanyaan ini biasa dalam pengenalpastian polimer, saringan plastik tidak diketahui, penyelesaian masalah QC, pengesahan bahan kitar semula, dan semakan tugasan puncak yang disokong oleh literatur.
Kesilapan biasa
- Menganggap satu jalur terpencil sebagai bukti bahan tanpa memeriksa sekurang-kurangnya satu atau dua puncak sokongan.
- Mengabaikan pertindihan: pelbagai kumpulan berfungsi boleh menyumbang berhampiran nombor gelombang yang sama.
- Melangkau pengesahan apabila bahan tambahan, campuran, pengoksidaan, atau pencemaran boleh memesongkan spektrum.
Nasihat pengesahan
Apabila kekaburan masih ada, sahkan hipotesis dengan DSC, GC-MS, atau TGA, terutamanya untuk campuran, sampel terdegradasi, dan polimer terisi.
Literatur di sebalik penetapan ini
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keyakinan 1.0
“Two peaks at 2090 and 2081 Al 2 + peak could be due to oxidized Pt, the sample was reduced by are observed when CO O was passed over Pt/CeO 2/Al 2O 2 3”
Bera 等 - 2003 - Promoting effect of CeO2 in combustion synthesized DOI: 10.1021/jp022132f -
keyakinan 1.0
“When 0.18 0.03 mol CO/(mol Au) are adsorbed on Au at C, which shows an IR band at 2090 ( oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 0.2 mol CO(mol Au min)-1, which is close to the steady-state turnov”
In Situ Transient FTIR and XANES Studies of the Evolution of Surface Species in CO Oxidation on Au/TiO<sub>2</sub> DOI: 10.1021/jp0568733 -
Adsorbed carbon monoxide keyakinan 1.0
“Keywords: CN(cid:2) 2108cm(cid:2)1 CN(cid:2) and CO adsorbed alone, the band is blue shifted from 2090 to at In comparison of Pt(110) ad 4cm(cid:2)1V(cid:2)1;”
Tian 等 - 2011 - In situ FTIR studies of coadsorption of CNand CO DOI: 10.1016/j.jelechem.2011.04.028 -
Silicon (Si) keyakinan 1.0
“Additionally, the cm-1 peaks at around 2090 are attributed to Si-H bonds (a shift of the Si-H stretching cm-1 mode from 2000 to 2090 is caused by the electronegativity difference between the nearest neighbouring atoms in the network structu”
Cheng 等 - 2007 - Chemically active plasmas for deterministic assemb DOI: 10.1088/0022-3727/40/8/S10 -
keyakinan 1.0
“The presence of the band at 2090 can be assigned Pd+ Pd/CeO sample (Fig.”
Towards Methane Combustion Mechanism on Metal Oxides Supported Catalysts: Ceria Supported Palladium Catalysts DOI: 10.1007/s11244-019-01143-8 -
Nitrile keyakinan 1.0
“The cross-section of spectra (Figure 2d) and the rFTIR line around 2090 cm-1 assigned to cyano stretching visample S1 in the OM photography in visible light (Figure 3a) shows a clearly visible ≡ bration ν(C N) (Figure 2e) confirmed the pres”
Multianalytical Study of the Blue Pigments Usage in Serbian Iconography at the Beginning of the 18th-Century DOI: 10.3390/coatings13071200 -
Silicon hydride keyakinan 1.0
“cm-1 and 1100 (bond generated by the interaction of the substrate surface with oxygen present in the cm-1 environment, previous activation), Si-H (640 cm-1 wagging mode and 2000 stretching vibration cm-1 modes), Si-H (2090 stretching vibrat”
Gomez-Montano 等 - 2020 - Detection of Salmonella enterica on silicon substr DOI: 10.24275/rmiq/Bio993 -
Alkene (C=C) keyakinan 1.0
“The AHC sample cm-1, shows a medium peak at 2090 which is characteristic of stretching allene (C=C=C).”
Microwave-Assisted Hydrothermal Carbonization of Pomegranate Peels into Hydrochar forEnvironmental Applications DOI: 10.3390/en15103629
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