What absorbs at 574 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 574 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.

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 574 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 band at 574 corresponds to Element Weight (%) Atomic (%) Cu-O stretching vibration.”

  Green synthesis of bimetallic Pt@Cu nanostructures for catalytic oxidative desulfurization of model oil DOI: 10.1007/s40097-017-0223-8
• confidence 1.0

  “The absorption bands observed at 752.97 and 574.11 cm-1 were assigned to C-Cl and C-Br stretching of alkyl halides, respectively.”

  Facile Green Synthesis of Zinc Oxide Nanoparticles with Potential Synergistic Activity with Common Antifungal Agents against Multidrug-Resistant Candidal Strains DOI: 10.3390/cryst12060774
• confidence 1.0

  “Then, a band at 574 associated with 4 4the Zn-O symmetric stretching vibration in the ZnO was also spotted.”

  A Study on Optical Properties of Zinc Silicate Glass-Ceramics as a Host for Green Phosphor DOI: 10.3390/app10144938
• Silicon (Si) confidence 1.0

  “cm-1 and 574 were the symmetrical stretching vibration of PO A comparison of the was due to the asymmetrical stretching vibration of Si-O-Si;”

  Novel Hydroxyl-Containing Quaternary Ammonium Salt N-(2-Hydroxyethyl)-N, N-Dimethyl-3-[(1-Oxododecyl)amino]- 1-Propanaminium: Its Synthesis and Flotation Performance to Quartz DOI: 10.3390/min13050702
• Phosphate (PO4) confidence 1.0

  “The peaks at 1044.38 cm-1 and 602.37 cm-1 were attributed to the asymmetric stretching vibration of P-O-P bond in PO 43-, the peak at 574.37 cm-1 indicated the in-plane bending vibration of P-O-P in PO (Lu et al., 1998;”

  Wei 等 - 2020 - Investigating flotation behavior and mechanism of DOI: 10.37190/ppmp/119662
• confidence 1.0

  “Specifically, a new peak attributed to Cr at 574.5 eV was observed in LR-EPI-8-Cr, indicatSpecifically, a new peak attributed to Crat 574.5 eV was observed in LR-EPI-8-Cr, indicatSpecifically, a new peak attributed to Cr at 574.5 eV was obs”

  Efficient Removal of Heavy Metals from Aqueous Solution Using Licorice Residue-Based Hydrogel Adsorbent DOI: 10.3390/gels9070559
• Phosphate (PO4) confidence 0.9

  “Explicit assignment: 'PO group at 574'”

  Natasha 等 - 2008 - Fourier transform infrared study on sol-gel derive DOI: 10.4028/www.scientific.net/AMR.47-50.1185