What absorbs at 2180 cm⁻¹ in an FTIR spectrum?
A band near 2180 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 5 cited sources
Jawapan pantas
A band near 2180 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 0 | 1.0 |
Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.
Bahan yang mungkin
| Bahan | Puncak sokongan | Kumpulan bertindih | Sumber dipetik |
|---|---|---|---|
| zeolite | 2180, 1013, 1245 | Hydroxyl (O-H), Silicon (Si) | 1 |
| CO | 2180, 1670, 1620 | Hydroxyl (O-H) | 1 |
Bahan hanya dipaparkan apabila kumpulan literatur yang sama menyokong jalur ini dan sekurang-kurangnya satu puncak ciri tambahan.
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 2180 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
-
Carbonyl (C=O) keyakinan 1.0
“as indicating majority of authors cite values below 2000 carbonyl band near 2180 They also found that CO rapidly”
Kumar 等 - 2011 - In Situ FT-IR Study on the Effect of Cobalt Precur DOI: 10.1021/jp104878e -
Silicon hydride keyakinan 1.0
“A Si-H peak position of cm-1 2180 in the Fourier transform infrared absorption spectrum indicates a N/Si ratio around 1.2.”
Low Temperature Silicon Nitride by Hot Wire Chemical Vapour Deposition for the Use in Impermeable Thin Film Encapsulation on Flexible Substrates DOI: 10.1166/jnn.2011.5100 -
Hydroxyl (O-H) keyakinan 1.0
“However, there probe the BAS and yield the band at 2180 is no considerable variation in BAS in exchanged zeolites, comFTIR difference spectra in the hydroxyl-stretching region dis-”
Batool 等 - 2022 - Correlating Lewis acid activity to extra-framework DOI: 10.3929/ethz-b-000536201 -
keyakinan 0.9
“Explicit assignment in snippet: '2180 cm- band (CO adsorbed on TiO2)'.”
Rasko 等 - 2007 - Characterization of Au-RhTiO2 catalysts by CO ads DOI: 10.1007/s11144-007-5080-x -
keyakinan 0.7
“Band at 2180 cm-1 mentioned as CO band.”
Rasko 和 Kiss - 2006 - CO oxidation in the presence of hydrogen on AuTiO DOI: 10.1007/s10562-006-0133-8
Ada spektrum dengan jalur ini?
Muat naik spektrum FTIR anda dan dapatkan laporan tafsiran penuh — penetapan puncak dengan petikan literatur, padanan perpustakaan, dan rantaian bukti berkadar keyakinan — dalam beberapa saat.