What absorbs at 509 cm⁻¹ in an FTIR spectrum?
A band near 509 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 5 cited sources
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Metal oxygen | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| S s | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Literature behind these assignments
-
C-O single bond confidence 1.0
“Finally, the weak peak at about be due, respectively, to the overlapping of symmetrical cm-1 C\\O\\C Ti\\O\\Ti 509 stretching and asymmetrical stretching vibration of alkyl may be assigned to the stretching of skeletal of ethers adsorbed on”
Clabel 等 - 2020 - Organo-mineral associations in a Spodosol from nor DOI: 10.1016/j.geodrs.2020.e00303 -
Thiol confidence 1.0
“The existence of a peak at 2573 cm-' assigned to SH stretching mode and the lack of a synergistic peak at 509”
Vibrational Spectroscopic Studies on the Disulfide Formation and Secondary Conformational Changes of Captopril–HSA Mixture after UV-B Irradiation DOI: 10.1562/2005-04-25-RN-497 -
Alkyl C-H confidence 1.0
“4) show transtail in the longer wavelengths, which may be due to the size cm-1 (C-H mittance peaks at 509.12 distribution of the particles (Ahmad et al.”
Roni 等 - 2013 - Evaluation of leaf aqueous extract and synthesized DOI: 10.1007/s00436-012-3220-3 -
confidence 1.0
“Notably, prominent vibrations at 516, 510, and 509 cm-1 correspond to Fe-”
Morales-Mendoza 等 - 2023 - Effect of Micro-Nanobubbles on Arsenic Removal by DOI: 10.3390/jof9080857 -
Metal oxygen confidence 1.0
“At last, the new band appearing at 509 is attributed to M-O stretching vibration, which is absent in ligand spectra [18].”
Wang 等 - 2009 - Synthesis, Crystal Structure, and Kinetics of the DOI: 10.3390/molecules14072582
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