What absorbs at 1573 cm⁻¹ in an FTIR spectrum?
A band near 1573 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 4 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkene (C=C) | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Protein alpha helix | 1 | 0 | 1.0 |
| Protein beta sheet | 1 | 0 | 1.0 |
| Alkyl C-H | 1 | 0 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
Carboxyl (COOH) confidence 1.0
“However, for esterification, the results were calibration showed better results carboxylate band, ν(COO-), at 1573 cm-1 relative to a single baseline at 1820 cm-1 for FTIR using only one peak.”
Monitoring Enzymatic Hydroesterification of Low-Cost Feedstocks by Fourier Transform InfraRed Spectroscopy DOI: 10.3390/catal9060535 -
Ring structure confidence 1.0
“is richer in ways especially in the spectral range of We 1573 and 1585 These bands are assigned to ring in-plane”
Moumene 等 - 2014 - Vibrational spectroscopic study of ionic liquids DOI: 10.1016/j.molstruc.2014.02.034 -
C c single bond confidence 1.0
“In the FTIR spectrum of pure aspirin (Figure 7 A), = -1 several strong vibrations were presented at 1770 cm (C O Figure 8 X-ray diffraction pattern of (A) pure aspirin, (B) blank = -1 -1 stretch), 1600 cm (C C stretch), 1573 cm (OCO antisym”
Banerjee 等 - 2013 - Influence on variation in process parameters for t DOI: 10.1515/secm-2012-0078 -
Alkene (C=C) confidence 1.0
“The range cm-1 cm-1 rings), 1363 (C-H rocking at mannopyranosyl ring), 1453 (C-C-H bending 1100-1700 cm-1 also includes less intense bands, such as 1288 and 1434 cm-1, which cm-1 at dihydroxyphenyl ring + C-O-H bending at benzene ring), 157”
Rosiak 等 - 2023 - Do Rutin and Quercetin Retain Their Structure and DOI: 10.3390/molecules28062713
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