What absorbs at 1139 cm⁻¹ in an FTIR spectrum?
A band near 1139 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 1139 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 |
|---|---|---|---|
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| N n bond | 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 |
|---|---|---|---|
| PMMA | 1139, 1722, 1383 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| ZnO nanoparticles | 1139, 1219, 1726 | Methacrylate, Acetate, C-O single bond | 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 1139 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
-
Acetate keyakinan 1.0
“The membrane-vehicle numbers as the proportion of water in the cosolvent increased coefficient partition (K) calculated using eq 4: C-O (Figure 1c) as did the stretching motion of PG at 1139”
Benaouda 等 - 2012 - Discriminating the Molecular Identity and Function DOI: 10.1021/mp300127f -
C c single bond keyakinan 1.0
“Meanwhile, the peaks at around 1139 and cm-1 726 corresponded to C-C-O asymmetric stretching and C-O symmetric stretching, cm-1.”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Carbohydrate keyakinan 1.0
“Zoomed in fingerprint region showing carbohydrate specific peaks at carbohydrates (1200 cm-1, cm-1, cm-1 1139cm-1.”
Dhaulaniya 等 - 2020 - Development of an FTIR based chemometric model for DOI: 10.1080/19440049.2020.1718774 -
Acetate keyakinan 1.0
“(Figure 2B), which can be assigned to the C=O stretching in aliphatic and aromatic ester 1725 cm-1 (Figure 2B), which can be assigned to the C=O stretching in aliphatic and cm-1 groups, the peak at 1164 (Figure 2C), corresponding to the C-O”
Cutinase-Catalyzed Polyester-Polyurethane Degradation: Elucidation of the Hydrolysis Mechanism DOI: 10.3390/polym14030411 -
Alkyl C-H keyakinan 1.0
“The 3 cm-1, cm-1 other bands were observed at 1139 and 990 attributed to the -CH twisting.”
Carrier mechanism of ZnO nanoparticles-embedded PMMA nanocomposite organic bistable memory device DOI: 10.1016/j.solidstatesciences.2019.106046 -
Alkyl C-H keyakinan 1.0
“1113cm-1 and1149cm-1 areherebyassignedto1139cm-1 According to DFT calculations, there are 14 C-H stretchand 1164cm-1 ing vibrations in different combinations between 3000 and , respectively, according to Table 1 and relative PED”
Ullah 等 - 2016 - Fourier Transform Infrared Spectroscopy of Bisphe DOI: 10.1155/2016/2073613 -
Silicon (Si) keyakinan 1.0
“cm-1 1200-400 The peaks at 1139.24 and 1095.99 are assigned to stretching cm-1 cm-1 vibration of Si-O, the peaks at 1031.25 and 1008.16 are assigned to stretching cm-1 cm-1 vibration of Si(Al)-O, the peaks at 787.56 and 761.71 are assigned”
Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110 -
Amide keyakinan 1.0
“When comparing in cellulose can be intensity patterns at cm(cid:3)1, 'Days 8-11' with alterations in the protein regions manifests 1054 which displays a reduction over time, and cm(cid:3)1 across all three approaches with the amide III peak”
Application of vibrational spectroscopy techniques to non-destructively monitor plant health and development DOI: 10.1039/c5ay00377f
Ada spektrum dengan jalur ini?
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