What absorbs at 1211 cm⁻¹ in an FTIR spectrum?
A band near 1211 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 1211 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 |
|---|---|---|---|
| C-O single bond | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| Amide | 4 | 4 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Water (H2O) | 2 | 2 | 1.0 |
| Nitrate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
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 |
|---|---|---|---|
| AuNPs | 1211, 1646, 1721 | Methacrylate, Acetate | 1 |
| rGO | 1211, 2358, 2930 | Methacrylate, Acetate, C-O single bond | 1 |
| hydrogels | 1211, 3281, 1700 | Methacrylate, Acetate | 1 |
| PVDF | 1211, 1160, 840 | Methacrylate, Acetate | 1 |
| gold nanoparticles | 1211, 1638, 3252 | 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 1211 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
“The free scavenging effect of crude cm-1 vs at 1211.30 shows C-N stretching and peak extract synthesized AuNPs is shown in the Table”
Bawazeer 等 - 2021 - Synthesis, Characterization and Bioactivity Profil DOI: 10.22207/JPAM.15.2.11 -
Water (H2O) keyakinan 1.0
“Two discrete populations of supramolecular structures were evident from the infrared spectroscopy: water-rich cm-1) structures, predominant below a PG volume fraction (f PG) of 0.4 (unmoving water bending vibration at 1211 and PG-rich C-H s”
Benaouda 等 - 2012 - Discriminating the Molecular Identity and Function DOI: 10.1021/mp300127f -
Alkyl C-H keyakinan 1.0
“CH bending aldehyde cm-1 1069 S=O stetching sulfoxide S=O stetching sulfoxide cm-1 1211 C-O stretching vinyl ether”
Leemarose 等 - 2021 - Sustainable Synthesis of Gold Nanoparticles and it DOI: 10.13005/ojc/370216 -
keyakinan 1.0
“SEM cm-1, CQ displayed N-H stretch at 3300 C-N stretch at cm-1, cm-1, C=C aromatic stretch at 1612 and C-Cl 1211 cm-1 peaks between 600 and 800 (Fig.”
Owonubi 等 - 2018 - Characterization and in vitro release kinetics of DOI: 10.1007/s40090-018-0139-2 -
Acetate keyakinan 1.0
“cm-1 1506 (C=C aromatic skeletal stretching vibration), 1453 (C-H deformation), cm-1 cm-1 cm-1 1420 (C-H deformation (aromatic ring)), 1260 (C-O stretching), 1211 (Ccm-1 cm-1 C, C-O and C=O stretching), 1154 (C-O-C vibrations), and 1021 (C-”
Altuntas 等 - 2017 - Biodegradation Properties of Wood-plastic Composit DOI: 10.1002/app.24358 -
Acetate keyakinan 1.0
“The principal peaks found after KK transformation cm-1) correspond to the signals of acetate (1736, 1365 and 1211 and nitrate (1635, 1273 and roughly correspond to the signals of acetate (1736, 1365 and 1211 cm-1) and nitrate (1635, cm-1) 8”
Advantages of External Reflection and Transflection over ATR in the Rapid Material Characterization of Negatives and Films via FTIR Spectroscopy DOI: 10.3390/polym14040808 -
C-O single bond keyakinan 1.0
“Additionally, in the finger print region, below cm-1, cm-1 1700 other vibration bands of C-O bonds at 1211 and of C=C at 1579 in the SA spectra are shifted to higher wavenumbers in the eutectic mixtures, showing participation”
Georgescu 等 - 2021 - Thermal Behavior of the Nimesulide-Salicylic Acid DOI: 10.3390/ma14247715 -
Water (H2O) keyakinan 1.0
“Effect of additive content Generally, the IR absorption bands at approximately cm-1 1211, 1149, 1069, 975, 854, 794, and 763 represent the characteristic spectrum of an α phase PVDF Due to the water solubility of IL, PVDF membranes precryst”
Poly(vinylidene fluoride) (PVDF) membrane fabrication with an ionic liquid via non-solvent thermally induced phase separation (N-TIPs) DOI: 10.1007/s13201-021-01499-x
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.