What absorbs at 2357 cm⁻¹ in an FTIR spectrum?
A band near 2357 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 2357 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 |
|---|---|---|---|
| Carbon dioxide | 4 | 4 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 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 |
|---|---|---|---|
| AgNPs | 2357, 1232, 1048 | N h, Methoxy (OCH3) | 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 2357 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
“[41] where phytocatalytic synthesis of AgNPs using Synsepalum dulcificum showed a prominent peak at cm-1 2357 and 1641 which revealed the involvement of phenolic compounds and proteins.”
Kumar 等 - 2017 - Photo-induced and phytomediated synthesis of silve DOI: 10.1016/j.jphotobiol.2017.04.022 -
Acetate keyakinan 1.0
“stretching vibration bands of imidazolium ring appeared at 2357 The active C-O stretching cm-1 vibration band appears at 1461 and corresponding C-O bending vibration peak is observed cm-1.”
Ionic liquid mediated morphologically improved lanthanum oxide nanoparticles by Andrographis paniculata leaves extract and its biomedical applications DOI: 10.1016/j.jre.2019.06.006 -
Carbon dioxide keyakinan 1.0
“Medium stretching O=C=O 2357 Carbon dioxide Strong stretching C-H 2889 Alkane Medium stretching N-H 3325 Aliphatic primary amine”
Development and characterization of natural sourced bioplastic for food packaging applications DOI: 10.1016/j.heliyon.2023.e13538 -
Carbon dioxide keyakinan 1.0
“9 TG and corresponding DTG curves for poly(TRIM) and 4VPTRIM microspheres obtained in air atmosphere are water (bands in the region of 3,700-3,600 and cm-1) 1,600-1,400 and carbon dioxide (peaks at 2357, cm-1) 2311 and 670 [18, 19].”
Grochowicz - 2014 - Investigation of the thermal behavior of 4-vinylpy DOI: 10.1007/s10973-014-4066-y -
Ammonium keyakinan 1.0
“Anotherpeakaround2356.8330cm-1 cm-1 to 2379.7074 was observed in all the spectra except PGG which was possibly due to cm-1 ammonium ions (N-H).”
Hydrolysis, Microstructural Profiling and Utilization of Cyamopsis tetragonoloba in Yoghurt DOI: 10.3390/fermentation9010045 -
Carbon dioxide keyakinan 1.0
“evolution of carbon dioxide (peaks at 2357, 2311 and Figure 12 presents the Gram-Schmidt plots obtained cm-1) 670 during the thermal decomposition of the parent and carbon monoxide (peaks at 2174,”
Synthesis and thermal properties of parent and modified DMN–co-GMA copolymers DOI: 10.1007/s10973-018-7162-6 -
Silicon-oxygen (Si-O) keyakinan 0.9
“Same sentence as peak 687, attributed to Si-O bonds.”
Huseynov 等 - 2018 - Fourier transform infrared spectroscopic study of DOI: 10.1142/S0217979218500741 -
keyakinan 0.9
“Explicit assignment in text.”
Samra 和 Athar - 2009 - Novel Synthesis of Mannosamine Conjugated Magnetic DOI: 10.1007/s12257-008-0314-y
Ada spektrum dengan jalur ini?
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