What absorbs at 2560 cm⁻¹ in an FTIR spectrum?
A band near 2560 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
Quick answer
A band near 2560 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.
Possibili assegnazioni di gruppi funzionali
| Gruppo funzionale | Fatti di supporto | Fonti citate | Affidabilità massima |
|---|---|---|---|
| Thiol | 4 | 3 | 1,0 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.
Possible materials
| Materiale | Picchi di supporto | Overlapping groups | Fonti citate |
|---|---|---|---|
| keratin | 2560, 1635, 1717 | Hydroxyl (O-H) | 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 2560 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.
Letteratura dietro queste assegnazioni
-
Thiol affidabilità 1,0
“4B, the double mutant C78/122S 2560cm(cid:3)1, did not show an apparent absorptivity around indicatb1(1-194) sGC was S-nitrosated by GSNO ingthatthethiolsignalfromC174wasveryweak.Thepeakaround 2560cm(cid:3)1 is mainly contributed by the S-H”
Liu 等 - 2015 - The process of S-nitrosation in sGC beta 1(1-194) DOI: 10.1016/j.molstruc.2015.02.056 -
Thiol affidabilità 0,9
“Text: 'stretching S-H bonds vibration was observed at ... 2560 cm-1'.”
Ciurko 等 - 2019 - Enzymatic bioconversion of feather waste with kera DOI: 10.2478/pjct-2019-0030 -
affidabilità 0,8
“Shifted peak upon ligand binding, still attributed to sulfhydryl groups.”
Guarrera 等 - 1999 - Ligand-linked changes at the subunit interfaces in DOI: 10.1021/bi990942k -
Thiol affidabilità 0,7
“Shoulder of shifted S-H stretch”
Chavan 等 - 2013 - Fundamental Aspects of H2S Adsorption on CPO-27-Ni DOI: 10.1021/jp402440u
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