What absorbs at 3560 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 3560 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.

Penetapan kumpulan berfungsi yang mungkin

Pemeringkatan mencerminkan bukti literatur terkumpul, bukan satu peraturan berwibawa. Sentiasa sahkan terhadap konteks sampel anda.

Possible materials

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 3560 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.

Literatur di sebalik penetapan ini

• Water (H2O) keyakinan 1.0

  “The presence of ν(ОН) bands at 3630 cm-1 and 3560 cm-1 in the spectrum of the organic phase at [Li+]org = 0 indicates that [C8mim][NTf2]*nH2O hydrates are formed when the ionic liquid is in contact with water.”

  Study of Lithium-Extraction Systems Based on Benzo-15-Crown-5 Ether and Alkylimidazolium-BasedIonic Liquid DOI: 10.3390/molecules28030935
• Hydrogen bond keyakinan 1.0

  “cm-1 The band at 3560 is connected to intramolecular hydrogen bonds in phenolic cm-1 lignin (band I).”

  Impact of Natural Degradation on the Aged Lignocellulose Fibers of Moroccan Cedar Softwood: Structural Elucidation by Infrared Spectroscopy (ATR-FTIR) and X-ray Diffraction (XRD) DOI: 10.3390/fermentation8120698
• Hydrogen bond keyakinan 1.0

  “cm-1.36,49 lignin is observed at around 3568-3577 equation , where γ is the standard o In cellulose, the intra-molecular hydrogen bond frequency corresponding to free OH groups (3560 cm-1,36,47,48 vibration appears at around 3432 cm-1), γ i”

  Kempaiah 等 - 2020 - FTIR AND WAXS STUDIES ON SIX VEGETAL FIBERS DOI: 10.1016/j.carres.2005.08.007
• Hydroxyl (O-H) keyakinan 1.0

  “The shoulders around 3040 and 3560 cm-1 were typical stretching vibrations of O-H units (present in all sugars, peptides, and residual water) [17].”

  Koliastasi 等 - 2019 - Emulsifiers from Partially Composted Olive Waste DOI: 10.3390/foods8070271
• Hydroxyl (O-H) keyakinan 1.0

  “The first weak band near 3560 which could be due to a gauche jet-FTIR evidence for an alcohol dimer overtone was found for donor OH stretch, perhaps in a gauche-gauche dimer.”

  Suhm 和 Kollipost - 2013 - Femtisecond single-mole infrared spectroscopy of m DOI: 10.1039/c3cp51515j
• keyakinan 0.8

  “Snippet: 'characteristic spectra showed two bands at 3640 and 3560 of the water forming H-bonds to the anions'.”

  MacMillan 等 - 2012 - Interaction of Water Vapor with the Surfaces of Im DOI: 10.1021/jp305029n