What absorbs at 3585 cm⁻¹ in an FTIR spectrum?
A band near 3585 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 6 cited sources
Quick answer
A band near 3585 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Water (H2O) | 2 | 2 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
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 3585 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.
Literature behind these assignments
-
N h confidence 1.0
“LLM confirmed rule peak-group candidate”
Budiarto - 2017 - The Effect of Antioxidant Concentration of N-isopr DOI: 10.1063/1.4978141 -
Hydroxyl (O-H) confidence 1.0
“glassy aqueous Ca(ClO on the structure of water is magnified on the low wavenumber 4) solutions at low temperatures, the | January 2 http://pubs.rsc.org cm(cid:1)1 side of the O-H stretching bonds in the difference spectra peaks at 3585 and”
Chen 等 - 2004 - ATR-FTIR spectroscopic studies on aqueous LiClO4, DOI: 10.1039/B311768E -
Water (H2O) confidence 1.0
“confirmed water molecules is by the deconvoluted bands at 3585, Theseeffectsmaybeascribedtochangesinwettability,asorganicmol3525,3454,3450,3380and3262cm-1(Fig.2a).Inparticular,therela-”
Clabel 等 - 2020 - Organo-mineral associations in a Spodosol from nor DOI: 10.1016/j.geodrs.2020.e00303 -
Water (H2O) confidence 1.0
“1994), the band at 3585 (band D) may be attributed to water of the inner cm-1 hydration sphere of the interlayer cations whereas the band at 3440 (band F) may be due to cm-1 absorbed H 2O stretching vibration (Russel and Farmer 1964).”
Schingaro 等 - 2021 - New insights into the crystal chemistry of sauconi DOI: 10.2138/am-2020-7460. -
confidence 1.0
“and studies of Mn cm-1 active water molecule on the OEC,which gave rise to the S model compounds, this vibrational mode at 606 band in the 1 cm-1 cm-1,was ∼3585 ∼3618 at S and the S state was assigned to a Mn-O-Mn cluster vibration in the b”
Fourier transform infrared difference spectroscopy for studying the molecular mechanism of photosynthetic water oxidation DOI: 10.3389/fpls.2013.00146 -
Metal hydroxyl confidence 1.0
“On the other hand, the characteristics 3519cm-1 bands of the Al-OH group transitional vibration band at at 3585 and were observed for calcined kaolinite 908cm-1 Si-O-AlVI 600°C, samples at but the intensity of hydroxide bands was and the be”
Kassa 等 - 2022 - Characterization and Optimization of Calcination P DOI: 10.1155/2022/5072635
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