What absorbs at 526 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 526 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

Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.

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 526 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

• Hydroxyl (O-H) confidence 1.0

  “The shows that the weak band at to O-H stretching modes of the surface adsorbed water which 526cm-1 is assigned to Ti-O stretching vibration along the”

  Calcination temperature effect on dielectric, structural and morphology properties of BaTiO3 nano-structure prepared by modified sol—gel technique DOI: 10.1088/2043-6254/ab798d
• Silicon (Si) confidence 1.0

  “Two cm-1 cm-1 peaks at 526 and 461 detected by FTIR were assigned to Si-O-Al and Si-O-Si vibrations, respectively, and confirmed the presence of nanoclay in the OS polymer.”

  Modification of Oxidized Starch Polymer with Nanoclay for Enhanced Adhesion and Free Formaldehyde Emission of Plywood DOI: 10.1007/s10924-021-02101-w
• Metal oxygen confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Optical, electrical, mechanical, and thermal properties and non-isothermal decomposition behavior of poly(vinyl alcohol)–ZnO nanocomposites DOI: 10.1007/s13726-020-00806-8
• Alkyl C-H confidence 1.0

  “Besides, the C-O-C stretching and deformation vibration were found at 1253.7 and 1123.7 cm-1, respectively, while peaks at 993.7, 772.8, 694.8, and 525.8 cm-1 were due to the C-H bending vibrations of polymer networks [30].”

  Development of Biodegradable Agar-Agar/Gelatin-Based Superabsorbent Hydrogel as an Efficient Moisture-Retaining Agent DOI: 10.3390/biom10060939
• Silicon (Si) confidence 1.0

  “cm-1and 526 cm-1 are assigned to the deformation vibrations of Si-O-Si and Al O-Si, correcm-1 cm-1 bands at 470 and 526 are assigned to the deformation vibrations of Si-O-Si and spondingly [9,55,56].”

  Khodosova 等 - 2022 - Magnetic Nanosorbents Based on Bentonite and CoFe2 DOI: 10.3390/min12111474
• confidence 0.9

  “Bands at 526, 620, 834, 950 coupled to Y zeolite formation structure.”

  Dal Pozzo 等 - 2019 - Free fatty acids esterification catalyzed by acid DOI: 10.1039/c8ra10248a
• Silicon-oxygen (Si-O) confidence 0.9

  “Explicit assignment in text.”

  Composite of bentonite and cyclodextrin as an efficient catalyst for promoting chemical transformations in aqueous media DOI: 10.1038/s41598-021-84349-9
• Phosphate (PO4) confidence 0.8

  “Snippet: 'Vibration O-P-O 527 526'”

  Effect of preparation conditions on the nanostructure of hydroxyapatite and brushite phases DOI: 10.1007/s13204-015-0509-4