What absorbs at 517 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 517 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 authoritative 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 517 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

• confidence 1.0

  “9 b, it can be 2 cm-1 seen a bare TiO displays abroad bandbelow 517 due to 2 the vibration of Ti-O-Ti bonds in TiO (Djellabi et al.”

  New composite material based on Kaolinite, cement, TiO2 for efficient removal of phenol by photocatalysis DOI: 10.1007/s11356-021-13150-y
• Metal oxygen confidence 1.0

  “The absorption band at 517 cm-1 vibration of Zn-O bonds and confirms the formation of materials [44].”

  Innovative Investigation of Zinc Oxide Nanoparticles Used in Dentistry DOI: 10.3390/cryst12081063
• Acetate confidence 1.0

  “646.78 CS stretching - 1384.21 Asymmetric COC stretching of lignin 517.10 - Out of plane bending of OH C-O stretching of acetyl group in lignin and hemicel- -”

  Biodegradable Green Composites: Effects of Potassium Permanganate (KMnO4) Treatment on Thermal, Mechanical, and Morphological Behavior of Butea Parviflora (BP) Fibers DOI: 10.3390/polym15092197
• confidence 1.0

  “below new bands appeared at 517 and 303cm-1, The bond distances of the complex obtained in this work assigned to the Zn-N stretching, and at 317 and”

  Cordeiro 等 - 2019 - A Novel Zn-II Complex Bearing Two Monodentate (4-M DOI: 10.1155/2019/7876495
• Silicon (Si) confidence 1.0

  “peaks at 797, 779 and 693 For the same samples, the sharp band at 456 and cm-1-this the peak at 517 last one observed only in PK11552-can be ascribed to Si-O bending vibrations [31].”

  Assessment of Easily Accessible Spectroscopic Techniques Coupled with Multivariate Analysis for the Qualitative Characterization and Differentiation of Earth Pigments of Various Provenance DOI: 10.3390/min12060755
• confidence 1.0

  “The presence of tetrahedral titanium in the TiO2/Al-ZSM-12 sample, which forms SiO-Ti bonds, is confirmed by bands with maxima at 517 cm-1 (Raman, Figure 4b) [42,43] and 953 cm-1 (DRIFTS, Figure 4d) [44,45].”

  Synthesis and Investigation of Zeolite TiO2/Al-ZSM-12 Structure and Properties DOI: 10.3390/catal13020216
• Metal carbon confidence 0.9

  “Explicit assignment for R”

  Ashfaq 等 - 2016 - SYNTHESIS AND BIOLOGICAL ACTIVITY OF NEW SERIES OF DOI: 10.5935/0100-4042.20150171
• Sulfur confidence 0.8

  “Bands due to s(C=O).”

  Hyperoxaluria is related to whewellite and hypercalciuria to weddellite: What happens when crystalline conversion occurs? DOI: 10.1016/j.crci.2015.12.011