What absorbs at 2186 cm⁻¹ in an FTIR spectrum?
A band near 2186 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 4 cited sources
Jawapan pantas
A band near 2186 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 |
|---|---|---|---|
| Adsorbed carbon monoxide | 2 | 2 | 1.0 |
| Silicon hydride | 2 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 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 2186 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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Silicon hydride keyakinan 1.0
“Then, to determine 2186cm-1 907cm-1 and at the due to SiH asymmetric the concentration in the plasma, three other independent 4 bending [15].”
Fourier-transformed infrared absorption spectroscopy: a tool to characterize the chemical composition of Ar--NH3--SiH4 dielectric barrier discharge DOI: 10.1088/0022-3727/46/46/464007 -
Hydroxyl (O-H) keyakinan 1.0
“on shoulder at 2144 bands at 2150 and 2155 which areslightly up-shifted, can and a small band at 2186 Upon 2013 cm(cid:2)1, be attributed to CO hydrogen-bonded to OH groups of different evacuation, the band at 2144 which is very close to th”
Farra 等 - 2013 - Understanding CeO2 as a Deacon catalyst by probe m DOI: 10.1039/C2CP42767B -
Adsorbed carbon monoxide keyakinan 1.0
“7 showed bands typical of carbon max cm-1, dioxide (at 2359-2310 attributed to asymmetric stretching vibration and at cm-1 669 attributed to the degenerate bending vibration), carbon monoxide (at cm-1 *2186 and 2114 related to stretching vi”
Transparent sulfur-containing thermoplastic polyurethanes with polyether and polycarbonate soft segments DOI: 10.1007/s00289-017-2088-x -
Adsorbed carbon monoxide keyakinan 1.0
“7 3D plots of FTIR spectra of volatile products obtained during cm-1, 916 connected with C-H out-of-plane deformation the thermal decomposition of the RPURs H and HM vibration of vinyl group) and carbon monoxide (at cm-1, *2186 attributed t”
Aliphatic polycarbonate-based thermoplastic polyurethane elastomers containing diphenyl sulfide units DOI: 10.1007/s10973-016-5420-z
Ada spektrum dengan jalur ini?
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