What absorbs at 1085 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1085 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 1085 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

• C-O single bond confidence 1.0

  “1085cm-1 note that the (strongest peak) of resin having 40mol% OCH 3groupsremainedasSi OCH 3whichshowedthevibrationat 1085cm-1.Thedecreasingintensityof∼1085cm-1withincreasing (cid:2)(Si DPSD generated due to the vibration of OCH 3) group gr”

  Jana 等 - 2008 - Non-hydrolytic sol-gel synthesis of epoxysilane-ba DOI: 10.1016/j.matchemphys.2008.06.070
• Acetate confidence 1.0

  “cm-1 (H O H bending) 1652 cm-1 (C H stretching) 1164 cm-1 (C O stretching) 1085 cm-1 (C O C bending) 1032 cm-1 (aliphatic C H stretching) 2957 mixture Physical cm-1 ( CH stretching) 2928”

  Telmisartan complex augments solubility, dissolution and drug delivery in prostate cancer cells DOI: 10.1016/j.carbpol.2013.09.077
• Acetate confidence 1.0

  “FTIR Analysis of FA and HA the peaks were around 1085~1030 cm-1, which were assigned to the C-O stretching The FTIR spectra of FA and HA extracted from the BL and RS (Figure 7) presented vibration of alcohols, ethers, and thiols.”

  Co-Thermal Oxidation of Lignite and Rice Straw for Synthetization of Composite Humic Substances: Parametric Optimization via Response Surface Methodology DOI: 10.3390/ijerph192416875
• Nucleic acid confidence 1.0

  “cm-1 (DNA), 1542 eas were found in the region related to proteins and DNA, specifically at 1085 cm-1 (ER+) (amide II) and 1650 (amide I), where the MCF-7 cell line displays a larger absorbance (ER-).”

  Mostaco-Guidolin 等 - 2010 - Molecular and chemical characterization by Fourier DOI: 10.3233/SPE-2010-0466
• confidence 1.0

  “This implies that no asymmetric S O bending vibrations), 993 1symmetric S O cm-1 degradation/corrosion was induced at the steel substrate for major ((cid:4) stretching vibration) and between 1085 and 1185 asym-”

  Simultaneous in situ Kelvin probe and Raman spectroscopy analysis of electrode potentials and molecular structures at polymer covered salt layers on steel DOI: 10.1016/j.electacta.2012.08.042
• Acetate confidence 1.0

  “Further, C-O stretching (1085 and the vibrational shift of the extracted samples cm-1 at 2178 which exhibited linear variation were also concomitant with previous studies.”

  Sudatta 等 - 2020 - Extraction, characterization and antimicrobial act DOI: 10.1016/j.ijbiomac.2020.06.291
• Acetate confidence 1.0

  “The C-O stretching vibration band arises at 1085, 1023, and 1022 cm-1.”

  Innovative Investigation of Zinc Oxide Nanoparticles Used in Dentistry DOI: 10.3390/cryst12081063
• Carbohydrate confidence 1.0

  “The most important peak cm-1 at 1085 revealed the presence of a pyranose form of sugars [9].”

  Trigui 等 - 2018 - Physicochemical properties of water-soluble polysa DOI: 10.1016/j.ijbiomac.2018.05.202