What absorbs at 1669 cm⁻¹ in an FTIR spectrum?
A band near 1669 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
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Amide | 7 | 6 | 1,0 |
| Carbonyl (C=O) | 4 | 4 | 1,0 |
| Carboxyl (COOH) | 3 | 3 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| Ketone | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Amine primary | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Protein alpha helix | 1 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Ammonium | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| C=n | 1 | 1 | 0,9 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Literatūra aiz šiem piešķīrumiem
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Amide pārliecība 1,0
“Both concanavalin A and cm-1 immunoglobulin G showed a major band at about 1669 (30% of the total amide I band), which was β-sheet assigned to secondary structures.”
Sadat 和 Joye - 2020 - Peak Fitting Applied to Fourier Transform Infrared DOI: 10.3390/app10175918 -
Carbonyl (C=O) pārliecība 1,0
“LLM confirmed rule peak-group candidate”
Preparation and Characterization of Polymer Membranes Impregnated with Carbon Nanotubes for Olive Mill Wastewater DOI: 10.3390/polym14030457 -
Acetate pārliecība 1,0
“υ The key FTIR spectral features of CFZ are (OH) phenolic coefficients 3423cm-1, 3297cm-1, The correlation were in the range from 0.9994 υ υ band at (NH) band at (CH) aromatic 3090cm-1, 2950cm-1, to 0.9996 for the studied drugs in pure form”
Ali 等 - 2017 - Solid-State FTIR Spectroscopic Study of Two Binary DOI: 10.1155/2017/5673214 -
Alkene (C=C) pārliecība 1,0
“The peak at 1669 cm-1 may be attributed to the C=C stretching vibrations [19].”
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 -
Amide pārliecība 1,0
“All 0.98 (<0.01, CPC3) 2 represented, e.g., by the amide I and amide II bands at 1669 and Additional plant data Sweden <0.01 2 1540cm-1,respectively,tolipids,exemplifiedbyvibrationsat1156, Italy <0.01 3 Norway”
Combining Chemical Information From Grass Pollen in Multimodal Characterization DOI: 10.3389/fpls.2019.01788 -
pārliecība 1,0
“Adsorption Mechanism cm-1 cm-1, nitrogen adsorption, the position of the peak was shifted from 3332.82 to 3270.09 and the 1654cm-1 1669cm-1, The possible adsorption mechanism of ammonium nitrogen onto the CTS-ZMS surface can be”
Chitosan Modified Zeolite Molecular Sieve Particles as a Filter for Ammonium Nitrogen Removal from Water DOI: 10.3390/ijms21072383 -
Carbonyl (C=O) pārliecība 1,0
“(C=O) The amide I band originates from symmetric stretching vibrations of the carbonyl functional cm-1), β-turn α-helical group and indicates changes in anti-parallel sheets and (1688, 1681, 1669 cm-1), cm-1),”
Grunert 等 - 2020 - Vibrational Spectroscopy of Peritoneal Dialysis Ef DOI: 10.3390/biom10060965 -
Amide pārliecība 1,0
“cm-1 r DASH in H 2O (black line) and D 2O (green line) buffer look similar in the 1800-1350 M cm-1 region, but with a slight shift in the amide I region, reduced intensity at 1675 (+) and a n cm-1 newly appearing band at 1669 (-) (Figure 7a”
Iwata 等 - 2010 - Key Dynamics of Conserved Asparagine in a Cryptoch DOI: 10.1021/bi1009979.
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