What absorbs at 1584 cm⁻¹ in an FTIR spectrum?
A band near 1584 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
Quick answer
A band near 1584 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Amide | 8 | 8 | 1.0 |
| Alkene (C=C) | 5 | 5 | 1.0 |
| Methacrylate | 5 | 5 | 1.0 |
| Acetate | 5 | 5 | 1.0 |
| Aromatic ring | 5 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 4 | 1.0 |
| N h | 4 | 4 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Protein random coil | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| N n bond | 1 | 1 | 0.9 |
| C c single bond | 1 | 1 | 0.7 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| chitosan | 1584, 1650, 1655 | Amide, Acetate, Methacrylate | 1 |
| alginate | 1584, 1100, 1715 | Methacrylate, Acetate, Amide | 1 |
| TiO2 | 1584, 1700, 1093 | Methacrylate, Acetate | 1 |
| TiO | 1584, 1730, 1699 | Methacrylate, Acetate | 1 |
| sodium alginate | 1584, 1636, 1080 | Methacrylate, Acetate, Amide | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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 1584 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literature behind these assignments
-
Acetate confidence 1.0
“(C-H were observed at 2840 stretch) (Figure 6a), 2340, 1705 cm-1 (CdO (C-O At 300 K, the sXPS spectra suggest that there is one binding (both stretch), 1584 stretch), 1387, and 1364 COO-”
Durand 等 - 2010 - Reaction of Formic Acid over Amorphous Manganese O DOI: 10.1021/jp104629j -
confidence 1.0
“ing and C-F stretching, respectively.[20] Sodium alginate cm-1 showed peaks at 1583.96, 1406.68 provide information about water and carboxylic group of alginate and”
pH responsive alginate polymeric rafts for controlled drug release by using box behnken response surface design DOI: 10.1080/15685551.2016.1231046 -
Aromatic ring confidence 1.0
“(CH=N stretch), 1584 (C=C aromatic) 1272 (C1H-NMR δppm): N stretch).”
Spectroscopic and Physicochemical Investigations of Azomethines with Triphenylamine Core towards Optoelectronics DOI: 10.3390/ma15207197 -
Carbon dioxide confidence 1.0
“cm-1 The significant peak appearance at 1584 reported in this work is due to the presence of CO 2”
Study of structural, optical and electrical properties of La3+ doped Mg0.25 Ni0.15 Cu0.25 Co0.35 Fe2-x Lax O4 spinel ferrites DOI: 10.1016/j.physb.2020.412565 -
Acetate confidence 1.0
“The characteristic peak at 1584 is characteristic of the which exhibits the C-O group of the hemicellulose in UH.”
Investigation of Hemp and Flax Fiber-Reinforced EcoPoxy Matrix Biocomposites: Morphological, Mechanical, and Hydrophilic Properties DOI: 10.3390/polym14214530 -
Water (H2O) confidence 1.0
“Additionally, weak features are initially formed at 1705, 1602 and cm-1, although as adsorption progresses they are obscured by the strong water absorption at 1584”
Augugliaro 等 - 2008 - Photocatalytic oxidation of aromatic alcohols to a DOI: 10.1016/j.apcata.2008.07.038 -
N h confidence 1.0
“cm-1, cm-1 cm-1 Characteristic absorption bands at 1584 1419 and 1374 corresponded to the NH”
Aloe Vera extract-based composite nanofibers for wound dressing applications DOI: 10.1016/j.msec.2021.112061 -
Amide confidence 1.0
“Taking these properties into account, it follows that amide band I is more 1584, 1425, and 1454 The broad band at 3388 shows the presence of NH stretching, and OH stretching of hydrogen intermolecular interactions [59] present between sensi”
Development of a Novel Electrochemical Biosensor Based on Organized Mesoporous Carbon and Laccase for the Detection of Serotonin in Food Supplements DOI: 10.3390/chemosensors10090365
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