What absorbs at 2021 cm⁻¹ in an FTIR spectrum?
A band near 2021 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 2021 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 |
|---|---|---|---|
| Methacrylate | 10 | 10 | 1.0 |
| Acetate | 10 | 10 | 1.0 |
| Amide | 10 | 10 | 1.0 |
| C-O single bond | 8 | 8 | 1.0 |
| Methoxy (OCH3) | 7 | 7 | 1.0 |
| Alkyl C-H | 7 | 7 | 1.0 |
| Hydroxyl (O-H) | 6 | 6 | 1.0 |
| Carboxyl (COOH) | 5 | 5 | 1.0 |
| Carbonyl (C=O) | 5 | 5 | 1.0 |
| Secondary amine | 4 | 4 | 1.0 |
| C n single bond | 4 | 4 | 1.0 |
| Ketone | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| Hydrogen bond | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Metal carbon | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 0 | 0.7 |
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 |
|---|---|---|---|
| PVP | 2021, 2983, 1648 | Amide, Methacrylate, Acetate | 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 2021 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
-
Amide keyakinan 1.0
“These lines overlap, forming the amide I band, Molecules 2021, 26, 1174 4 of 14”
A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules -
Hydroxyl (O-H) keyakinan 1.0
“Variation of asymmetry and symmetry stretching and Media, LLC, part of Springer (NH4?) vibration of cation were investigated by deconvoluted peak of FTIR in Nature 2021 absorbance mode at O-H region and area of deconvoluted peaks in C-O reg”
Investigations of biodegradable polymer blend electrolytes based on Cornstarch: PVP: NH4Cl and its potential application in solid-state batteries DOI: 10.1007/s10854-021-05266-1 -
Hydroxyl (O-H) keyakinan 1.0
“4000-2500 Single bond Hydroxyl (O-H) Stretching (2021) Amine (N-H) New Used Ordinary Fly Bottom Aldehyde (C-H) (C≡C) 2500-2000”
Physicochemical properties of absorbent hydrogel polymers in disposable baby diapers DOI: 10.1016/j.cplett.2021.138605 -
C-O single bond keyakinan 1.0
“C-C-O stretch HEMA 880 C-C-O stretch Ethanol Polymers2021,13,3886”
Determination of Dental Adhesive Composition throughout Solvent Drying and Polymerization Using ATR–FTIR Spectroscopy DOI: 10.3390/polym13223886 -
C-O single bond keyakinan 1.0
“Sci.2021,11,5065 11of15 vibrations, C-OH bending deformation, C-H bond stretching and C=O and C=C groups)”
Characterization of a Spirit Beverage Produced with Strawberry Tree (Arbutus unedo L.) Fruit and Aged with Oak Wood at Laboratorial Scale DOI: 10.3390/app11115065 -
keyakinan 1.0
“It has generally been shown that the intensities of the peaks Molecules 2021, 26, x FOR PEER REVIEW 9 of 18 are attributed to oxygen vacancies within the nanostructures;”
Influence of the Alcoholic/Ethanolic Extract of Mangifera indica Residues on the Green Synthesis of FeO Nanoparticles and Their Application for the Remediation of Agricultural Soils DOI: 10.3390/molecules26247633 -
Alkyl C-H keyakinan 1.0
“O-H stretching 1005 C-H bending 829 C-H stretching Foods2021,10,1848”
Quantification of the Geranium Essential Oil, Palmarosa Essential Oil and Phenylethyl Alcohol in Rosa damascena Essential Oil Using ATR-FTIR Spectroscopy Combined with Chemometrics DOI: 10.3390/foods10081848 -
C-S single bond keyakinan 1.0
“positions and new bands at 870 (O-C-S stretching), cm-1 The evolution of most gaseous species ceased by the end and 2021 (S-C = O stretching) likely indicates the for-”
Thermal decomposition of tris(O-ethyldithiocarbonato)-antimony(III)—a single-source precursor for antimony sulfide thin films DOI: 10.1007/s10973-021-10885-1
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.