What absorbs at 1588 cm⁻¹ in an FTIR spectrum?
A band near 1588 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
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkene (C=C) | 2 | 2 | 0.9 |
| Carboxyl (COOH) | 2 | 2 | 0.9 |
| Amide | 2 | 2 | 0.9 |
| Aromatic ring | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 0.9 |
| Carbonyl (C=O) | 1 | 1 | 0.9 |
| C-O single bond | 1 | 1 | 0.7 |
| C=n | 1 | 1 | 0.7 |
| Ester | 1 | 1 | 0.7 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Ring structure confidence 1.0
“615cm21 important bands are those located at 1588, 1449, 1365, and due to C55C N-C55O stretching in chloroalkenes, pseudosymmetric stretching, respectively.[30] ring stretching in benzene and C-Cl stretching, 2013 June”
Armenta 等 - 2005 - Vibrational spectrometry strategies for quality co DOI: 10.1080/00387010500315843 -
Aromatic ring confidence 1.0
“Explicitly assigned as quinoid absorption.”
Archibong 等 - 2012 - Investigation of the binding of dioxin selective p DOI: 10.1016/j.synthmet.2012.04.012. -
Carbonyl (C=O) confidence 0.9
“Text: 'peak at 1588.19 cm-1 indicates a C=O stretch'”
Khalid 等 - 2020 - Thiolated sodium alginate conjugates for mucoadhes DOI: 10.1016/j.ijbiomac.2020.08.116 -
Nitrogen heterocycle confidence 0.9
“Explicit assignment: 'triazine bands at 1588 and 1562 cm-1'.”
Quintas 等 - 2003 - An infrared method, with reduced solvent consumpti DOI: 10.1081/SL-120026637 -
Amide confidence 0.9
“explicit assignment”
Reis 等 - 2021 - A Complementary and Revised View on the N-Acylatio DOI: 10.3390/md19070385 -
confidence 0.9
“Text: 'at 1588 describing the deformation vibrations of the N-H bonds of the chitosan amino groups'”
Sorokin 等 - 2022 - Chitosan Graft Copolymers with N-Vinylimidazole as DOI: 10.3390/polym14112279 -
Carboxyl (COOH) confidence 0.9
“anti-symmetric stretch”
Teng 和 Campanella - 2023 - A Plant-Based Animal Fat Analog Produced by an Emu DOI: 10.3390/gels9050393 -
Alkene (C=C) confidence 0.9
“v(C=C) at 1588”
Zhao 等 - 2017 - In Situ Time-Resolved Attenuated Total Reflectance DOI: 10.1021/acs.chemmater.7b03096.
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