What absorbs at 1110 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1110 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 1110 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 (Si)

  Reported band

  1110 cm-1

  Assignment

  Silicon (Si)

  Material / context

  Blue Sapphires from Baw-Mar Mine; kaolinite; blue sapphires

  Study on Gemological Characteristics of Blue Sapphires from Baw-Mar Mine, Mogok, Myanmar DOI: 10.3390/cryst11111275
• Hydroxyl (O-H)

  Reported band

  1110 cm-1

  Assignment

  Hydroxyl (O-H)

  Material / context

  Pt(111)

  Futamata 等 - 2005 - ATR-SEIR study of anions and water adsorbed on pla DOI: 10.1016/j.susc.2005.06.020
• Amide

  Reported band

  1110 cm-1

  Assignment

  Amide

  Material / context

  its Antidiabetic Activity of Anacardium Occidentale; gold nanoparticles

  Sustainable Synthesis of Gold Nanoparticles and its Antidiabetic Activity of Anacardium Occidentale DOI: 10.13005/ojc/370216
• Carbonyl (C=O)

  Reported band

  1110 cm-1

  Assignment

  Carbonyl (C=O)

  Material / context

  unsaturated self-assembled monolayers; secondary ozonide

  Secondary Ozonide Formation from the Ozone Oxidation of Unsaturated Self-Assembled Monolayers on Zinc Selenide Attenuated Total Reflectance Crystals DOI: 10.1021/jp901535t
• Amide

  Reported band

  1110 cm-1

  Assignment

  Amide

  Material / context

  high pressure induced gels of whey

  A comparative study of heat and high pressure induced gels of whey and egg albumen proteins and their binary mixtures DOI: 10.1016/j.foodhyd.2004.12.008
• Acetate

  Reported band

  1110 cm-1

  Assignment

  Acetate

  Material / context

  ZnO Nanocomposites; CuO; CuO/ZnO nanocomposites

  Synthesis of CuO/ZnO Nanocomposites and Their Application in Photodegradation of Toxic Textile Dye DOI: 10.3390/jcs3030091