What absorbs at 1645 cm⁻¹ in an FTIR spectrum?
A band near 1645 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
Możliwe przypisania grup funkcyjnych
| Grupa funkcyjna | Fakty wspierające | Cytowane źródła | Najwyższa wiarygodność |
|---|---|---|---|
| Amide | 54 | 51 | 1,0 |
| Carbonyl (C=O) | 32 | 30 | 1,0 |
| Hydroxyl (O-H) | 23 | 19 | 1,0 |
| Methacrylate | 22 | 21 | 1,0 |
| Carboxyl (COOH) | 22 | 21 | 1,0 |
| Acetate | 22 | 21 | 1,0 |
| Water (H2O) | 22 | 19 | 1,0 |
| Ketone | 17 | 16 | 1,0 |
| Ester | 16 | 15 | 1,0 |
| Alkene (C=C) | 11 | 11 | 1,0 |
| Protein random coil | 11 | 10 | 1,0 |
| N h | 10 | 9 | 1,0 |
| Protein | 8 | 8 | 1,0 |
| Alkyl C-H | 8 | 8 | 1,0 |
| C-O single bond | 7 | 7 | 1,0 |
| Aromatic ring | 7 | 5 | 1,0 |
| Carbohydrate | 6 | 6 | 1,0 |
| Methoxy (OCH3) | 6 | 6 | 1,0 |
| Secondary amine | 6 | 6 | 1,0 |
| Ring structure | 4 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Hydrogen bond | 2 | 2 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Urea | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Chitosan | 1 | 1 | 1,0 |
| Lipid | 1 | 1 | 1,0 |
| Protein beta sheet | 1 | 1 | 1,0 |
| Sulfur heterocycle | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Phospholipid | 1 | 1 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 0,9 |
Ranking odzwierciedla zgromadzone dowody literaturowe, a nie pojedynczą autorytatywną zasadę. Zawsze potwierdzaj w kontekście swojej próbki.
Literatura stojąca za tymi przypisaniami
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Hydroxyl (O-H) wiarygodność 1,0
“The peaks OH-stretching contribution in the region between ~3700 and ~3000 The cm-1 cm-1 at ~2979 cm-1 and ~2938 cm-1 are assigned to C-H stretching, while the peak centered at peaks at ~2979 and ~2938 are assigned to C-H stretching, while”
Hydrating Capabilities of the Biopolymers Produced by the Marine Thermophilic Bacillus horneckiae SBP3 as Evaluated by ATR-FTIR Spectroscopy DOI: 10.3390/ma15175988 -
Amide wiarygodność 1,0
“LLM confirmed rule peak-group candidate”
A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules -
Amide wiarygodność 1,0
“LLM confirmed rule peak-group candidate”
Glycation in human fingernail clippings using ATR-FTIR spectrometry, a new marker for the diagnosis and monitoring of diabetes mellitus DOI: 10.1016/j.clinbiochem.2016.09.001 -
Carbohydrate wiarygodność 1,0
“Spectral data treatment included normalization to amide I (about 1645 cm-1), multiple baseline correction and assignment of glucose-specific peaks in the 1000-1160 cm-1 region.”
Eikje - 2011 - In vivo interstitial glucose characterization and DOI: 10.1117/12.874735 -
Amide wiarygodność 1,0
“1) The relative intensity and relative area under peak parameters were reveal a superior absorption of plasma membrane proteins from madetermined by dividing the band area and band intensity of Amide I 1645cm-1 lignant tissues over those fr”
Plasma membrane proteins_ A new probe for the characterization of breast cancer DOI: 10.1016/j.lfs.2019.116777 -
Water (H2O) wiarygodność 1,0
“The peak at 1645 is usually assigned to the bound water present in”
Gani 等 - 2017 - Physico-chemical, structural, pasting and thermal DOI: 10.1016/j.ijbiomac.2016.10.100 -
Acetate wiarygodność 1,0
“( C-H) δ δ ( 1457 1375 In the amber samples a wide absorption shoulder in the ( C-O) 887 2) δ 2852 CH ( δ cm-1, region between 1255 and 1156 related to C-O stretch1645”
Differentiation between copal and amber by their structure and thermal behaviour DOI: 10.1007/s10973-023-12333-8 -
Carbonyl (C=O) wiarygodność 1,0
“The band at 1645 may indicate -C=O carbonyl groups and -C=Ccm-1 stretching [27].”
Hieu 等 - 2022 - Microorganism-mediated green synthesis of silver n DOI: 10.15251/DJNB.2022.171.359
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