What absorbs at 1098 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1098 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 1098 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

• Acetate confidence 1.0

  “The production of biodiesel from oil via a C-O transesterification reaction is monitored by the intensity of the ester cm-1), peak (1098 whereas the mixing of biodiesel and petroleum-based cm-1).”

  Ault 和 Pomeroy - 2012 - Quantitative Investigations of Biodiesel Fuel Usin DOI: 10.1021/ed101097n
• Phosphate (PO4) confidence 1.0

  “LLM confirmed rule peak-group candidate”

  Development of Composite Scaffolds Based on Cerium Doped-Hydroxyapatite and Natural Gums—Biological and Mechanical Properties DOI: 10.3390/ma12152389
• Acetate confidence 1.0

  “179 2 cm-1 cm-1 and the C-O of carboxyl stretching band at 1098 [13-15].”

  Synthesis of lanthanum tungstate interconnecting nanoparticles by high voltage electrospinning DOI: 10.1016/j.apsusc.2015.05.194
• Acetate confidence 1.0

  “cm-1 The band at 1098 showed the stretching of C-O groups, attributed to the presence of cm-1”

  Assiry 等 - 2023 - Microstructural and Elemental Characterization of DOI: 10.3390/app13074517
• confidence 1.0

  “bands indicated Si-O stretching vibration absorption peaks in While 1098 and 1037 cm-1 silicates, with an unknown silicate compound contributing to that band.”

  Multi-Method Analysis of Painting Materials in Murals of the North Mosque (Linqing, China) DOI: 10.3390/coatings13071298
• Acetate confidence 1.0

  “from esteric groups, the oxyethylene groups, at 1020 cm-1 for ν(C=C) of the aromatic ring, at 875 cm-1 showing the cm-1 cm-1 cm-1 from esteric groups, at 1408 cm-1 and 1449 cm-1 attributed to δ(CH2), at 1098 cm-1 for the νs(C-O) from δ(CH ν”

  Drobota 等 - 2020 - Preparation and Characterization of Electrospun Co DOI: 10.3390/ma13183961
• confidence 1.0

  “Explicit assignment in text”

  Novel Copper(II) Complexes with N4,S-Diallylisothiosemicarbazones as Potential Antibacterial/Anticancer Drugs DOI: 10.3390/inorganics11050195
• Carbonyl (C=O) confidence 1.0

  “The peak at 1723 and 1622 responsible for absorbance at 710 Peak at 1098 can be attributed cm-1 carbonyl stretching of carboxylate and ester, respectively.”

  Ismail 和 Hanafiah - 2020 - Kinetic, Isotherm, and Possible Mechanism of Pb(II DOI: 10.17576/jsm-2020-4907-11