What absorbs at 1579 cm⁻¹ in an FTIR spectrum?
A band near 1579 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 1579 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 | 4 | 4 | 1.0 |
| Carboxyl (COOH) | 4 | 4 | 1.0 |
| C c single bond | 4 | 4 | 1.0 |
| Methacrylate | 3 | 3 | 1.0 |
| Acetate | 3 | 3 | 1.0 |
| N h | 3 | 2 | 1.0 |
| Aromatic ring | 3 | 2 | 1.0 |
| Amine primary | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| C-O single bond | 2 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Acetyl | 1 | 1 | 1.0 |
| Lignin | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
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 | 1579, 1650, 1655 | Amide, Methacrylate | 1 |
| ZnO | 1579, 1400, 3430 | Methacrylate, Amide | 1 |
| graphene | 1579, 1720, 2097 | Methacrylate, Amide, Carboxyl (COOH) | 1 |
| TiO2 | 1579, 1700, 1093 | Methacrylate, Carboxyl (COOH) | 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 1579 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
“A small peak appears at 1751 indicates C=O shows that after addition of Pd on the SnO 2-graphene stretching vibration 1579.”
Debataraja 等 - 2018 - Synthesis and Characterization of Nanocomposites o DOI: 10.22146/ijc.26660 -
confidence 1.0
“cm-1 cm-1 1652 corresponds to vibration of carbonyl bond (amide I) while peak at 1579 corresponds to N-H bending of primary amine probably overlapped by N-H bending (amide II) cm-1 cm-1 of typical O=C-NHR groups and peak at 1359 and 1318 fo”
Jaiswal 和 Dhayal - 2020 - Preparation of 2D coatings of functionally graded DOI: 10.1016/j.matchemphys.2020.122663 -
C c single bond confidence 1.0
“30,479 1490 -N vibration of C -C 1579 13,502 Strong stretching vibration C 1578 104,148 1 90,646”
A case study of poly (aryl ether sulfone) hemodialysis membrane interactions with human blood: Molecular dynamics simulation and experimental analyses DOI: 10.1016/j.cmpb.2020.105742 -
C c single bond confidence 1.0
“The cm(cid:0) 1 = bonding enhanced the Raman intensities due to increased vibrations peak at 1579.1 in graphene-MoS2 could be ascribed to the C C [17].”
Synthesis of Graphene-MoS2 composite based anode from oxides and their electrochemical behavior DOI: 10.1016/j.cplett.2021.138969 -
Hydroxyl (O-H) confidence 1.0
“cm-1 cm-1, cm-1, 3502.40 and 1561.34 1568.54 dopant concentration, the particle size was reduced cm-1 1578.93 attributes the stretching mode of superthat might be due to the hindrance of Ostwald's ripenfluous - OH groups and H-O-H bending m”
Evaluation of physical properties and bactericidal efficacy of chemically developed undoped and Mn ( DOI: 10.1080/10667857.2020.1837542 -
Aromatic ring confidence 1.0
“2 b (2) C cm(cid:0) 1 0 Cis as follows: band at 1579 is due to the quinoid C stretching cm(cid:0) 1 vibration in the polymer chain, the intense band at 1460 is due to”
Efficient removal of Cr(VI) by polyaniline modified biochar from date (Phoenix dactylifera) seed DOI: 10.1016/j.gsd.2021.100653 -
Alkyl C-H confidence 1.0
“cm-1, Other bands are perceived around 1579 and 1383 cm-1, which are characteristic of skeletal Other bands are perceived around 1579 and 1383 which are characteristic of skeletal vibration of the graphene and C-H vibration, respectively.”
Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites DOI: 10.3390/ma15155284 -
C c single bond confidence 1.0
“trum exhibited strong peaks at 1721 (C =O stretching), 1256 and 1122 (C-O stretch) and small bands at 1600 Discussion cm-1 and 1579 (C-C aromatic ring stretching), all indicating the presence of a phthalate plasticiser [37].”
Non-invasive identification of polymers in cultural heritage collections: evaluation, optimisation and application of portable FTIR (ATR and external reflectance) spectroscopy to three-dimensional polymer-based objects DOI: 10.1186/s40494-019-0336-0
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.