What absorbs at 471 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 471 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 471 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

  “The weak peak was observed at 471 corresponds to the Ti-O stretching vibration, which indicates the formation of the perovskite phase [33].”

  Fabrication of the flexible nanogenerator from BTO nanopowders on graphene coated PMMA substrates by sol-gel method DOI: 10.1016/j.matchemphys.2017.02.002
• Metal hydroxyl confidence 1.0

  “cm-1 1635 3433 and 3749 Ammoand 2018), then the wavenumber of 470.63 cm-1 denoted as the Al-Al-OH vibrations nium ions have inserted inside the layer of ben532.35 cm-1 due to has bet- (Zaher MS et al., 2018).”

  Hakim 等 - 2023 - Ammonium-Assisted Intercalation of Java Bentonite DOI: 10.12911/22998993/156665
• Sulfate (SO4) confidence 1.0

  “expressed by bands at vibrations of hematite formed from the Si-free ferrihydrite were and around These can 548cm(cid:3)1 observed by two intense bands at 471 and be assigned to v (SO 4) and v 4(SO 4), respectively [10,11].”

  Spectroscopic characterization of iron ores formed in different geological environments using FTIR, XPS, Mössbauer spectroscopy and thermoanalyses DOI: 10.1016/j.saa.2014.10.090
• Metal oxygen confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Antioxidant and antidiabetic properties of biocompatible ceria oxide (CeO2) nanoparticles in mouse fibroblast NIH3T3 and insulin resistant HepG2 cells DOI: 10.1016/j.ceramint.2020.11.230
• confidence 1.0

  “cm-1 and 471 cm-1 were related to Fe-O stretching.”

  Veeramani 等 - 2022 - Vitamin Aand C-rich Pouteria camito fruit derive DOI: 10.4314/ahs.v22i1.78
• Ring structure confidence 1.0

  “Sci Food Agric pyranoid and furanoid ring vibrations of monoand 471 polysaccharides.”

  Amir 等 - 2013 - Application of Fourier transform infrared (FTIR) s DOI: 10.1007/s13197-011-0424-y
• Phosphate (PO4) confidence 1.0

  “cm-1 ν bending mode of PO while the band at 471 represents doubly degenerate 2 bending mode of phosphate ions.”

  Synthesis and Characterization of Polymer-Based Coatings Modified with Bioactive Ceramic and Bovine Serum Albumin DOI: 10.3390/jfb12020021
• Acetate confidence 1.0

  “stretch), (S=O stretch), 682.8-990.2cm-1 This trend has also been reported by the other researchers (C-O stretch), (C=C bending), and 471.4583.9cm-1 [29, 30].”

  Niazmand 等 - 2020 - Low-Density Polyethylene Films Carrying ferula asa DOI: 10.1155/2020/4098472