What absorbs at 1326 cm⁻¹ in an FTIR spectrum?
A band near 1326 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 1326 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 |
|---|---|---|---|
| Alkyl C-H | 7 | 6 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Ring structure | 3 | 2 | 1.0 |
| S eq o | 2 | 2 | 0.9 |
| Aromatic ring | 2 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Thiocarbonyl | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 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 |
| C c single bond | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 0.8 |
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 |
|---|---|---|---|
| chitosan | 1326, 1650, 1655 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| cellulose | 1326, 1735, 1650 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| hemicellulose | 1326, 1730, 897 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| cellulose nanocrystals | 1326, 1110, 1640 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| lignin | 1326, 1035, 1510 | Alkyl C-H, Methacrylate, C-O single bond | 1 |
| graphite | 1326, 1640, 1385 | Alkyl C-H, Methacrylate, 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 1326 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
-
Lipid keyakinan 1.0
“The peak at 1326 was assigned to lipid content,”
Krishnan 等 - 2020 - Leaf Extract ofDillenia indicaas a Source of Selen DOI: 10.3390/coatings10070626 -
Acetate keyakinan 1.0
“Peak identity C-O-C C=O/C-O C=C C=O stretch Edge states bending cm-1 It should be noted that the SERS on GQDs is also observed at 1326 for the D cm-1 peak and at 1584 for G peaks, similar to the Raman spectrum of the normal graphite,”
Surface Enhanced Raman Scattering in Graphene Quantum Dots Grown via Electrochemical Process DOI: 10.3390/molecules26185484 -
Acetate keyakinan 1.0
“Amorphous cellulose is a hydrophilic part of cellu1740-1760 and asymmetrical vibration of tannin aromatic C-O and lose with high abundance of hydroxyl groups (-OH) so that cm-1 CH 2-OH groups at peaks of 1326, 1037, and 1420 the part has st”
Nanostructural, Chemical, and Thermal Changes of Oil Palm Empty Fruit Bunch Cellulose Nanofibers Pretreated with Different Solvent Extractions DOI: 10.1007/s12649-017-0098-4 -
Alkyl C-H keyakinan 1.0
“(C-H stretching reported that the frequencies of allicin in FTIR spectra were 3083 cm-1 2), 2978 cm-1 (C-H stretching symmetric of =CH 2),1634 cm-1 (a medium asymmetric of =CH intensity band originating from stretching of terminal C=C bond”
Tasci 等 - 2016 - Determination of alliin and allicin in the plant o DOI: 10.17660/ActaHortic.2016.1143.19 -
Amide keyakinan 1.0
“Notably, The bands at 1326 cm-1 and 1238 cm-1 are attributed to the C-N stretching of the aromatic cm-1 cm-1 1633 is due to the C=C stretching of the quinoid, and 1428 is the characteristic benzenoid rings.”
Preparation of Anionic Surfactant-Based One-Dimensional Nanostructured Polyaniline Fibers for HydrogenStorage Applications DOI: 10.3390/polym15071658 -
Alkyl C-H keyakinan 1.0
“The cm-1 absorbance ratio of the bands detected at 1326 and 2903 was attributed to the flexural and stretching vibrations of the C-H bonds.”
Part A: Biodegradable Bio-Composite Film Reinforced with Cellulose Nanocrystals from Chaetomorpha linum into Thermoplastic Starch Matrices DOI: 10.3390/polym15061542 -
Thiocarbonyl keyakinan 1.0
“The FTIR spectrum of cm-1 the HNT-TSC-PC showed the characteristic bands of HNTs included, 1649, 539 and 3621-3696 as well as cm-1, two additional band at 1326 which is representative of C=S stretching and the strong absorption peaks of”
Investigation of halloysite nanotubes and Schiff base combination with deposited copper iodide nanoparticles as a novel heterogeneous catalytic system DOI: 10.1038/s41598-021-02991-9 -
Alkyl C-H keyakinan 1.0
“The three new bands confirmed the cm-1 cm-1 successful carboxymethylation of carrageenan: 1595 and 1418 related to the asymmetrical and symmetrical stretching vibrations of carboxylate anions (-COO-) and cm-1 the bands at 1326 attributed to”
Application of Vibrational Spectroscopic Techniques in the Study of the Natural Polysaccharides and Their Cross-Linking Process DOI: 10.3390/ijms24032630
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