What absorbs at 1600 cm⁻¹ in an FTIR spectrum?
A band near 1600 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 1600 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
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 |
|---|---|---|---|
| polystyrene | 1600, 1020, 1733 | Aromatic ring, Carbonyl (C=O), Amide | 1 |
| microplastics | 1600, 1643, 1614 | Alkene (C=C), Carbonyl (C=O), Aromatic ring | 1 |
| activated carbon | 1600, 1575, 1210 | Aromatic ring | 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 1600 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
-
Aromatic ring confidence 1.0
“For the drug QF, FT-IR analysis showed the characteristic 51 cm@1 peaks at 1600, 766 and 745 which are attributed to 52 presence of substituted benzene ring.”
Arikibe 等 - 2019 - pH-Responsive Studies of Bacterial CelluloseChito DOI: 10.1002/slct.201902290 -
Hydroxyl (O-H) confidence 1.0
“Surface area was found as cm-1 m2/g tional H-O-H bending band at around 1600 can be 36.453 with BET method.”
Synthesis and characterization of activated carbon produced from waste human hair mass using chemical activation DOI: 10.1007/s42823-019-00099-9 -
Acetate confidence 1.0
“The bands appearing between 1600cm-1 cm-1 1800 are associated with C=O bonds.”
Synthesis, Optical, Chemical and Thermal Characterizations of PMMA-PS/CeO2 Nanoparticles Thin Film DOI: 10.3390/polym13071158 -
Amide confidence 1.0
“In (NH3þ cm(cid:1)1 cm(cid:1)1 at 1638 the same way and according to Muyonga, Cole, and Duodu (2004), (amide I band of the acetyl group),1555 cm(cid:1)1 the amide I absorption band between 1600 and 1700 band, partially super-imposed with am”
Spectroscopic analyses of the influence of electron beam irradiation doses on mechanical, transport properties and microstructure of chitosan-fish gelatin blend films DOI: 10.1016/j.foodhyd.2014.09.038 -
Carboxyl (COOH) confidence 1.0
“The presence of a band at 1600 and 1423 attributes salts of the carboxyl”
Structural analysis and antioxidative properties of mutan (water-insoluble glucan) and carboxymethyl mutan from Streptococcus mutans DOI: 10.1016/j.procbio.2020.07.006 -
C-O single bond confidence 1.0
“The ether peaks that lie 1600, 1584 Benzene ring from DGEBF (a)”
Probing deformation of double-walled carbon nanotube (DWNT)/epoxy composites using FTIR and Raman techniques DOI: 10.1016/j.compscitech.2010.04.025 -
Alkene (C=C) confidence 1.0
“cm-1, ing ageing-related changes (hydroxyl groups, broad bands from 3100 to 3700 alkenes ing ageing-related changes (hydroxyl groups, broad bands from 3100 to 3700 cm-1, alkenes cm-1, cm-1) or carbon double bonds, 1600 and 1680 and carbonyl”
Campanale 等 - 2023 - Fourier Transform Infrared Spectroscopy to Assess DOI: 10.3390/polym15040911 -
Protein confidence 1.0
“The Secondary Structure of Proteins cm-1 d2A/dν2 Figure 2 shows the normalized spectrum for the region from the 1600 cm-1, to the 1700 and the Gaussian deconvolution of the amide I band for the control”
A Preliminary Study of FTIR Spectroscopy as a Potential Non-Invasive Screening Tool for Pediatric Precursor B Lymphoblastic Leukemia DOI: 10.3390/molecules
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.