What absorbs at 2220 cm⁻¹ in an FTIR spectrum?
A band near 2220 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 7 cited sources
Jawapan pantas
A band near 2220 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 | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Nitrile | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Ammonium | 1 | 0 | 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 2220 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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Carbonyl (C=O) keyakinan 1.0
“Very similar spectra were reported in the case of CO Ni+(CO) 2155, 2120, 3 Ni-ZSM-5.13 adsorption on Two carbonyl bands, at 2220 and and 2113 cm-1, Ni+(CO) 2212 have been found.”
Penkova 等 - 2007 - Effect of the preparation method on the state of n DOI: 10.1021/jp071927p -
Nitrile keyakinan 1.0
“nitrile moieties for which a nitrile peak at about 2220-2230 A We must, thus, conclude that the two peaks in the double bond range are both due to a G G G G G G G G G G G G C=C moiety, and unequivocally not due to a C=N moiety.”
Investigation of the chemical changes during thermal treatment of polyacrylonitrile and 15N-labelled polyacrylonitrile by means of in-situ FTIR and 15N NMR spectroscopy DOI: 10.1016/j.polymdegradstab.2017.10.018 -
Nitrogen heterocycle keyakinan 1.0
“In the FTIR spectra, the nearly absence of peaks at around 2220 along with the emergence of strong cm-1 triazine absorption bands around 1500, 1360 and 800 indicated qualitatively a high degree of polymerization.”
Yu 等 - 2015 - Room Temperature Synthesis and Substituent Effect DOI: 10.6023/A15020091 -
keyakinan 1.0
“al.23 Cu2+(CO) cm-1 disagree with Szanyi et who attributed a complex to the band at 2220 observed on Cu-SSZ-13 sample after CO reduction at 573 K and subsequently vacuum activated at 773 K.”
Giordanino 等 - 2013 - Characterization of Cu-exchanged SSZ-13 a compara DOI: 10.1039/c3dt50732g -
keyakinan 1.0
“The Al species mostly originated from the dehydroxylation process (represented by the CO bands at 2230 and 2220 cm-1 β represented by the CO bands at 2200-2190 significantly populated only in were attributed”
Pyra 等 - 2020 - Evaluation of the Textural Parameters of Zeolite B DOI: 10.3390/molecules25040926 -
Carbon dioxide keyakinan 1.0
“CO2 at 2220 cm-1”
Starowicz 等 - 2014 - Alumina-based nanoparticles obtained by anodic dis DOI: 10.1007/s10008-014-2447-6 -
keyakinan 0.9
“explicit assignment”
Nazari 等 - 2017 - Fibrous polymeric buccal film formulation, enginee DOI: 10.1016/j.ijpharm.2017.09.029
Ada spektrum dengan jalur ini?
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