What absorbs at 1108 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1108 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 1108 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

  “Text states 'cm21 at 1108 and 2087 confirmed SiNWs were passivated by both oxygen and hydrogen atoms.'”

  Synthesis and Characterization of Silicon Nanowires by Electroless Etching DOI: 10.1007/s11665-018-3179-z
• Aromatic ring confidence 1.0

  “cm-1 band 1180 Strong peak vibration at 1108 cm-1 and 841 indicated in plane aromatic C-H deformation.”

  Synthesis and characterization of Heck-cross coupling 4-(4-nitrostyryl) aniline as potential precursor in Schiff-base synthesis DOI: 10.1063/1.5002293
• confidence 1.0

  “Si-O antisymmetric cm(cid:3)1, stretching band is found at 1108 Si-O symmetric stretching The FTIR spectra of physical mixtures of CoO and SiO having 2 bandat804cm(cid:3)1,andSi-Orockingmotionbandatapproximately theminimumandmaximummolarfra”

  Jonynaite 等 - 2010 - Spectroscopic analysis of blue cobalt smalt pigmen DOI: 10.1016/j.vibspec.2009.12.005
• C-O single bond confidence 1.0

  “three bands in the spectrum, located at 1370 1335 and 1315 The results cm-1 highlighted two key bands related to polysaccharides in cellulose: the 1160 band corcm-1 responding to the ring breathing, and the 1108 band representing the glycos”

  Effects of Wet and Dry Treatments on Surface Functional Groups and Mechanical Properties of Flax Fiber Composites DOI: 10.3390/coatings13061036
• Silicon (Si) confidence 1.0

  “the band of 1108 corresponding to Sicm-1 O-Si (asymmetric stretching of interstitial oxygen in Si) and absorption peaks at 882 and 2245”

  REVERSIBLE QUENCHING OF PHOTOLUMINESCENCE IN STAIN ETCHED POROUS SILICON AT HNO3 POSTTREATMENT AND ROLE OF OXYGEN BONDS DOI: 10.1016/j.jlumin.2017.11.011
• Acetate confidence 1.0

  “This also agrees C-O-C asymmetric stretching at β - glycosidic with Coban and Biyik [50], who reported a - cm-1 linkage, peaks around 1108 indicating higher BC production in a glucose media supplecm-1 C-O bond stretching, peaks around 1030”

  Akintunde 等 - 2022 - Bacterial Cellulose Production from agricultural R DOI: 10.1080/21655979.2022.2062970
• Acetate confidence 1.0

  “The peak at 1108 was due to the stretching of C-O [37].”

  A Soluble Humic Substance for the Simultaneous Removal of Cadmium and Arsenic from Contaminated Soils DOI: 10.3390/ijerph16244999
• Silicon (Si) confidence 1.0

  “Moreover, both the spectra showed peaks at 1108 and between 3300 and cm-1 A 3500 which were attributed to symmetrical stretch of and respectively νsi-O-si νsi-OH u t [39].”

  Nanostructured Diatom-ZrO2 composite as a selective and highly sensitive enzyme free electrochemical sensor for detection of methyl parathion DOI: 10.1016/j.snb.2019.03.036.