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
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Amide | 38 | 33 | 1.0 |
| Aromatic ring | 22 | 20 | 1.0 |
| Carbonyl (C=O) | 14 | 14 | 1.0 |
| Alkene (C=C) | 10 | 10 | 0.95 |
| Carboxyl (COOH) | 7 | 6 | 1.0 |
| N h | 6 | 6 | 0.9 |
| Hydroxyl (O-H) | 6 | 4 | 0.9 |
| Water (H2O) | 5 | 4 | 0.9 |
| Lignin | 4 | 2 | 0.95 |
| C=n | 3 | 3 | 0.95 |
| Protein | 3 | 3 | 0.8 |
| Amine primary | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 0.9 |
| Alkyl C-H | 2 | 2 | 0.8 |
| Carbohydrate | 2 | 1 | 0.7 |
| Ring structure | 1 | 1 | 0.9 |
| Nitrogen heterocycle | 1 | 1 | 0.9 |
| C-O single bond | 1 | 1 | 0.8 |
| C c single bond | 1 | 1 | 0.8 |
| Carbonate | 1 | 1 | 0.7 |
| Nitrile | 1 | 0 | 0.7 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Amide confidence 1.0
“Assigned to amide I and C=O stretching.”
El-Sohaimy 等 - 2022 - Nutritional Quality, Chemical, and Functional Char DOI: 10.3390/plants11212825 -
Aromatic ring confidence 1.0
“Explicit assignment: 'peak of aromatic C=C stretching is at around 1600 cm-1'.”
Rosyidi 等 - 2020 - Investigation of the chemical, strength, adhesion DOI: 10.1016/j.conbuildmat.2020.119364 -
confidence 1.0
“Assigned to symmetric stretching in MOF-5.”
Ali 和 Siddiqui - 2023 - Ionic Liquid Functionalized Metal-Organic Framewor DOI: 10.1021/acsomega.2c05808 -
Carboxyl (COOH) confidence 1.0
“Assigned to carboxylate and amine.”
Conzatti 等 - 2019 - Thermosensitive PNIPAM grafted alginatechitosan P DOI: 10.1016/j.apsusc.2018.10.269 -
Amide confidence 1.0
“amide I band occurs in 1690-1600 cm-1, mostly C=O stretching”
Swiadro-Pieton 等 - 2022 - Fast and Noninvasive Hair Test for Preliminary Dia DOI: 10.3390/molecules27165318 -
Amide confidence 0.95
“Explicit assignment: 1600-1690 Amide I (C=O stretch)”
Elkins - 2011 - Rapid Presumptive Fingerprinting of Body Fluids DOI: 10.1111/j.1556-4029.2011.01870.x -
C=n confidence 0.95
“Explicit assignment: '1600 (C=N)'.”
Karuppannan 和 Prashantha - 2010 - Nano structured carbon nitrides prepared by chemic DOI: 10.1117/12.861609 -
Lignin confidence 0.95
“Text: 'Peaks corresponding with lignin at 1600, 1507, 1456, and 1220'”
Solihat 等 - 2020 - Microwave assisted dilute organic acid pre-treatme DOI: 10.1088/1757-899X/935/1/012046
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