What absorbs at 1608 cm⁻¹ in an FTIR spectrum?
A band near 1608 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 |
|---|---|---|---|
| Aromatic ring | 11 | 9 | 0.95 |
| Alkene (C=C) | 3 | 3 | 0.9 |
| Carboxyl (COOH) | 3 | 3 | 0.9 |
| Carbonyl (C=O) | 3 | 2 | 0.9 |
| C-O single bond | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Urethane | 1 | 1 | 0.9 |
| N h | 1 | 1 | 0.9 |
| Methacrylate | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
C c single bond confidence 1.0
“Text: 'dominant peaks at 3327 and 1608 ... (C--C, C--O)'”
Maimulyanti 等 - 2019 - Adsorption and recovery of aroma compounds from wa DOI: 10.2306/scienceasia1513-1874.2019.45.446 -
Aromatic ring confidence 0.95
“Peak at 1608 cm-1 assigned to aromatic C=C (phenyl).”
Lopes 等 - 2022 - Development of an Antibacterial Dentin Adhesive DOI: 10.3390/polym14122502 -
Aromatic ring confidence 0.95
“Explicit assignment: 'C-C aromatic absorption band at 1608-1610'”
Moldovan 等 - 2019 - Evaluation of the Degree of Conversion, Residual M DOI: 10.3390/ma12132109 -
Aromatic ring confidence 0.9
“Characteristic absorption band of C=C bonds of aromatic ring.”
Barbadillo 等 - 2003 - Study of a curing reaction of an epoxy resin DOI: 10.4028/www.scientific.net/MSF.426-432.2163 -
N h confidence 0.9
“Peak at 1629~1608 cm-1 attributed to NH.”
Liao 等 - 2011 - Synthesis and Characterization of an Aminated D-gl DOI: 10.4028/www.scientific.net/AMR.197-198.65 -
Aromatic ring confidence 0.9
“Same as above”
Oliveira 等 - 2012 - Effect of Temperature on the Degree of Conversion DOI: 10.2341/11-198-L -
Aromatic ring confidence 0.9
“Explicit: 'aromatic peaks at 1608 cm-1'.”
Aldhafyan 等 - 2022 - Influence of curing modes on conversion and shrink DOI: 10.1016/j.dental.2021.12.004 -
Aromatic ring confidence 0.9
“explicit assignment”
Alonso 等 - 2016 - Development of carvedilol-cyclodextrin inclusion c DOI: 10.1111/jphp.12601
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