What absorbs at 2156 cm⁻¹ in an FTIR spectrum?
A band near 2156 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
Jawapan pantas
A band near 2156 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 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| C#c | 1 | 1 | 0.9 |
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 |
|---|---|---|---|
| TiO2 | 2156, 1700, 1093 | Hydroxyl (O-H) | 1 |
| GO | 2156, 1720, 1182 | 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 2156 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
-
Hydroxyl (O-H) keyakinan 1.0
“In cm-1, particular, beside the quite intense band at 2156 due to the presence of hydroxyls, an intense peak cm-1, cm-1”
Cesano 等 - 2010 - Designing TiO2 Based Nanostructures by Control of DOI: 10.1021/jp9087207 -
Adsorbed carbon monoxide keyakinan 1.0
“the predominant associates are the pyrrole-NH/carbon monoxide Hence, the results indicate that in the xenon matrix, once cm-1, and the form C, which gives rise to the band at 2155.9 formed by photolysis of P2C, the CO molecule shows an”
Infrared Spectra and Photochemistry of Matrix-Isolated Pyrrole-2-carbaldehyde DOI: 10.1021/jp911118v -
keyakinan 1.0
“observed at 2156 A peak of Si-O-Si was also visible at uniformly distributed.”
Khan 等 - 2021 - The Structural, Physical, and In Vitro Biological DOI: 10.14744/eej.2020.36349 -
keyakinan 1.0
“6 Background substracted DRIFT spectra showing a band at 2156 S14†), CO suggesting the conversion of the ketonic stretch cm-1 CO assigned to stretch vibration on Cu during TPD of 2,5-dmf CO Cu-ZSM-5IJ22).”
Valorisation of 2,5-dimethylfuran over zeolite catalysts studied by on-line FTIR-MS gas phase analysis DOI: 10.1039/d1cy01312b -
keyakinan 0.9
“Explicit assignment in text.”
Gutierrez 等 - 2012 - Liquid phase hydrogenation of crotonaldehyde over DOI: 10.1016/j.apcata.2012.06.011 -
C#c keyakinan 0.9
“Explicit: 'at 2156 for SWCNT-1'.”
Mateos-Gil 等 - 2015 - Electroactive carbon nanoforms a comparative stud DOI: 10.1039/c0xx00000x
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.