What absorbs at 907 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 907 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 907 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

• Silicon hydride

  Reported band

  907 cm-1

  Assignment

  Silicon hydride

  Material / context

  sub>-SiH4; Ar-NH3; Ar-SiH4-NH3 dielectric barrier discharge

  Fourier-transformed infrared absorption spectroscopy: a tool to characterize the chemical composition of Ar–NH3–SiH4dielectric barrier discharge DOI: 10.1088/0022-3727/46/46/464007
• Alkyl C-H

  Reported band

  907 cm-1

  Assignment

  Alkyl C-H

  Material / context

  C-Steel; OC; NaC

  Enhanced Coating Protection of C-Steel Using Polystyrene Clay Nanocomposite Impregnated with Inhibitors DOI: 10.3390/polym15020372
• Metal hydroxyl

  Reported band

  907 cm-1

  Assignment

  Metal hydroxyl

  Material / context

  reaction mixture of acetone and glycerol; reaction mixture; glycerol

  Green Production of Glycerol Ketals with a Clay-Based Heterogeneous Acid Catalyst DOI: 10.3390/app9214488
• C-S single bond

  Reported band

  907 cm-1

  Assignment

  C-S single bond

  Material / context

  polybenzimidazole; methanesulfonic acid; composite membrane samples

  Studies on Polybenzimidazole and Methanesulfonate Protic-Ionic-Liquids-Based Composite Polymer Electrolyte Membranes DOI: 10.3390/polym15132821
• Oxygen heterocycle

  Reported band

  907 cm-1

  Assignment

  Oxygen heterocycle

  Material / context

  epoxy; isosorbide resin

  Effect of a fluoroalkyl-functional curing agent on the wettability, thermal and mechanical properties of hydrophobic biobased epoxy coatings DOI: 10.1016/j.surfcoat.2019.02.006
• Hydroxyl (O-H)

  Reported band

  907 cm-1

  Assignment

  Hydroxyl (O-H)

  Material / context

  halloysite

  Jeziorska 等 - 2023 - Morphology and Selected Properties of Modified Pot DOI: 10.3390/polym15071762
• Alkene (C=C)

  Reported band

  907 cm-1

  Assignment

  Alkene (C=C)

  Material / context

  calcium carbonate; vulcanisates; historical synthetic polymers

  Material Analysis and a Visual Guide of Degradation Phenomena in Historical Synthetic Polymers as Tools to Follow Ageing Processes in Industrial Heritage Collections DOI: 10.3390/polym14010121