Apakah yang menyerap pada 1642 cm⁻¹ dalam spektrum FTIR?
Jalur berhampiran 1642 cm⁻¹ boleh menunjuk kepada beberapa kumpulan berfungsi. Di bawah adalah tugasan yang paling mungkin, disusun mengikut berapa banyak bukti yang diterbitkan menyokong setiap satu — setiap satu dapat dikesan ke literatur (DOI) dan disahkan silang terhadap 130,000+ spektrum rujukan dan graf pengetahuan kami.
Backed by 8 cited sources
Jawapan pantas
Jalur berhampiran 1642 cm⁻¹ biasanya ditafsirkan dengan memeriksa kumpulan berfungsi yang sering wujud bersama di sana dalam literatur, kemudian mengesahkan sekurang-kurangnya satu atau dua puncak tambahan dalam sampel yang sama. Halaman ini menyusun tugasan tersebut berdasarkan bukti terkumpul dan bukannya peraturan buku teks tetap tunggal.
Penetapan kumpulan berfungsi yang mungkin
| Kumpulan berfungsi | Fakta sokongan | Sumber dipetik | Keyakinan tertinggi |
|---|---|---|---|
| Amide | 25 | 22 | 1.0 |
| Water (H2O) | 14 | 13 | 1.0 |
| Hydroxyl (O-H) | 14 | 13 | 1.0 |
| Methacrylate | 11 | 11 | 1.0 |
| Acetate | 11 | 11 | 1.0 |
| Carbonyl (C=O) | 11 | 11 | 1.0 |
| Carboxyl (COOH) | 9 | 8 | 1.0 |
| Ester | 8 | 8 | 1.0 |
| Ketone | 7 | 7 | 1.0 |
| N h | 5 | 4 | 1.0 |
| Alkene (C=C) | 5 | 4 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Secondary amine | 4 | 3 | 1.0 |
| Alkyl C-H | 4 | 3 | 1.0 |
| Carbohydrate | 4 | 3 | 1.0 |
| Protein alpha helix | 3 | 3 | 1.0 |
| Chitosan | 3 | 2 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| N n bond | 1 | 1 | 1.0 |
| Acetyl | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Protein random coil | 1 | 1 | 1.0 |
| Protein beta turn | 1 | 1 | 1.0 |
| Lewis acid site | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Urea | 1 | 1 | 1.0 |
Peringkat mencerminkan bukti literatur terkumpul, bukan peraturan tetap tunggal. Sentiasa sahkan berdasarkan konteks sampel anda.
Bahan yang mungkin
| Bahan | Puncak sokongan | Kumpulan bertindih | Sumber dipetik |
|---|---|---|---|
| polyethylene | 1642, 1737, 1720 | Methacrylate, Hydroxyl (O-H) | 1 |
| nanocellulose | 1642, 1540, 1646 | Amide, Hydroxyl (O-H), Methacrylate | 1 |
Bahan hanya dipaparkan apabila kumpulan literatur yang sama menyokong jalur ini dan sekurang-kurangnya satu puncak ciri tambahan.
Logik spektrum
Jalur ini menjadi bermakna hanya apabila dibaca dengan puncak-puncak jirannya. Dalam amalan, penganalisis terlebih dahulu melihat tugasan di atas, kemudian menyemak sama ada sampel yang sama juga menunjukkan puncak lain yang dijangka untuk motif struktur yang sama. Jalur tunggal berhampiran 1642 cm⁻¹ biasanya tidak mencukupi untuk pengenalpastian bahan dengan sendirinya.
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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Carbonyl (C=O) keyakinan 1.0
“~1642cm-1 in all the treated pulp samples may be attributed to release of free carbonyl groups (C=O) due to the action of enzyme on 5.4.”
Exploring the lignolytic potential of a new laccase producing strain Kocuria sp. PBS-1 and its application in bamboo pulp bleaching DOI: 10.1016/j.ibiod.2019.104726 -
Water (H2O) keyakinan 1.0
“Isothermal rehydration process of preheated raffinose cmK1 8C for 81, 125 or 150 IR peak intensity at 1642 (1641) samples preheated sample was gradually increased with time, due to the 8C, absorption of water vapor from 30 70% RH condition.”
Cheng 和 Lin - 2006 - Processes of dehydration and rehydration of raffin DOI: 10.1016/j.carbpol.2005.11.024 -
Acetate keyakinan 1.0
“Spectral peaks of FTIR at 1641.79 confirmed the appearance of C--O CO32(cid:0) binding, with strong stretching of in Amide I.”
Biologically-induced synthetic manganese carbonate precipitate (BISMCP) for potential applications in heavy metal removal DOI: 10.1016/j.heliyon.2023.e15919 -
Amide keyakinan 1.0
“There was a very strong infrared (IR) band at cm-1 1642 generated primarily by the C = O stretching vibration from the amide I of protein in the spectrum (Tatulian, 2013), which overlapped with asymmetric stretching bands from carboxylate.”
Changes in chemical composition and structure of root cell wall of citrus rootstock seedlings in response to boron deficiency by FTIR spectroscopy DOI: 10.1080/14620316.2017.1362327 -
Acetate keyakinan 1.0
“cm-1 However, peaks are seen at 3479 for SnO 2-doped GO cm-1 cm-1 1639 (C=O stretching vibration), and 1642 (OH”
Reactive Oxygen Species (ROS) Are Generated as Organic Contaminants Are Broken Down: SnO DOI: 10.1007/s12668-023-01111-3 -
Hydroxyl (O-H) keyakinan 1.0
“5 of 23 https://doi.org/10.33263/BRIAC133.274 cm-1 In FTIR spectra, absorption peaks of 1.5% Tylose MH 50 at 3441 and 2835-2906 cm-1 indicated stretching vibrations of OH and symmetric and asymmetric C-H vibrations, cm-1 whereas peaks at 16”
Mustary 等 - 2023 - Synthesis and Characterization of Biocomposite Fil DOI: 10.33263/BRIAC133.274 -
Ester keyakinan 1.0
“The formed band at region broad peak at 1642 cm(cid:1)1 is attributed to formation of ester groups, which of 1642 is the result of reaction between the hydroxyl group of starch and anhydride groups of coupling agent.”
Physical and thermal mechanical properties of corn starch/LDPE composites DOI: 10.1002/app.37877 -
C c single bond keyakinan 1.0
“A new peak was detected at 1641.98 in the (C-C-- treated effluent indicating the presence of alkenes C symmetric (C-- stretch), ketones and aldehydes O stretch) (Fig.”
Greenhouse gases emissions from duckweed pond system treating polyester resin wastewater containing 1,4-dioxane and heavy metals DOI: 10.1016/j.ecoenv.2020.111253
Ada spektrum dengan jalur ini?
Muat naik spektrum FTIR anda dan dapatkan laporan tafsiran penuh — tugasan puncak dengan petikan literatur, padanan perpustakaan, dan analisis berasaskan literatur — dalam beberapa saat.