What absorbs at 1644 cm⁻¹ in an FTIR spectrum?
A band near 1644 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
Caktime të mundshme të grupeve funksionale
| Grup funksional | Fakte mbështetëse | Burimet e cituara | Besueshmëri e lartë |
|---|---|---|---|
| Amide | 10 | 8 | 1,0 |
| Water (H2O) | 6 | 5 | 0,9 |
| Alkene (C=C) | 4 | 2 | 1,0 |
| Carbonyl (C=O) | 3 | 3 | 0,9 |
| Hydroxyl (O-H) | 3 | 3 | 0,9 |
| Carboxyl (COOH) | 2 | 2 | 0,8 |
| Protein random coil | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 0,8 |
| C n single bond | 1 | 1 | 0,7 |
| N h | 1 | 1 | 0,7 |
| C=n | 1 | 0 | 0,9 |
Renditja pasqyron provat e grumbulluara të literaturës, jo një rregull të vetëm autoritar. Gjithmonë konfirmoni në kontekstin e mostrës suaj.
Literatura pas këtyre caktimeve
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Protein random coil besueshmëri 1,0
“Explicitly assigned in text.”
Wu 和 Zuo - 2011 - Research on Structure and Property of Silk Fibroin DOI: 10.4028/www.scientific.net/AMR.175-176.176 -
Alkene (C=C) besueshmëri 1,0
“Explicit assignment: 'Transmittances at 1644 were attributed to C=C stretch'”
Rowland 等 - 2018 - Further spectral and chromatographic studies of am DOI: 10.1080/14786419.2018.1428599 -
Amide besueshmëri 0,95
“Explicit assignment in text.”
Cojocaru 等 - 2022 - Electrospun Nanofibrous Membranes Based on Citric DOI: 10.3390/polym14020294 -
Amide besueshmëri 0,95
“Intensive band at 1644 corresponds to stretching peaks of amide I group of polypeptides.”
Kim 等 - 2019 - Highly Efficient and Stable Removal of Arsenic by DOI: 10.3390/ijms20143566 -
Carbonyl (C=O) besueshmëri 0,9
“Appearance of new absorption peaks at 1644 and 1725 cm-1 confirmed presence of C=O.”
Alam 等 - 2022 - Production and statistical optimization of cholest DOI: 10.1186/s43141-022-00433-1 -
Amide besueshmëri 0,9
“Explicit assignment: 'amide I ... peak ca. 1644'.”
Feng 等 - 2020 - Using advanced vibrational molecular spectroscopy DOI: 10.1371/journal.pone.0234126 -
Alkene (C=C) besueshmëri 0,9
“explicit assignment”
Harwijayanti 等 - 2022 - Physicochemical Characterization and Antibacterial DOI: 10.3390/coatings12050680 -
Water (H2O) besueshmëri 0,9
“Peak at 1644 cm-1 assigned to water bending vibration.”
Lopez-Lorente 等 - 2017 - Towards label-free mid-infrared protein assays in DOI: 10.1007/s00604-016-2031-0)
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