What absorbs at 1008 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1008 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.

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 1008 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

• Alkyl C-H confidence 1.0

  “1065.34±0.23 1.084±0.012 CAO *** ** stretching 1007.58±0.01 1009.61±0.16 0.647±0.096 0.209±0.001 CH2 bending”

  Differentiation in MALDI-TOF MS and FTIR spectra between two pathovars of Xanthomonas oryzae DOI: 10.1016/j.saa.2014.06.056
• C-S single bond confidence 1.0

  “A single band at the absorption peak of 1008Two organotin(IV) diallyldithiocarbamate compounds have m cm(cid:1)1 996 is associated with the (C---S) absorption band, which”

  Haezam 等 - 2021 - Synthesis and cytotoxic activity of organotin(IV) DOI: 10.1016/j.sjbs.2021.02.060
• Acetate confidence 1.0

  “3 1318.40 -C-H Bending 1239.32 C-O stretch 1164.09 C-N stretch 1100.44 C-O stretch 1007.85 C-O stretch”

  Rahmawati 等 - 2017 - The Liquid Biodiesel Extracted From Pranajiwa (Ste DOI: 10.1063/1.4978098
• Silicon (Si) confidence 1.0

  “The peaks at 1139.24 cm-1 and 1095.99 cm-1 are assigned to stretching vibration of Si-O, the peaks at 1031.25 cm-1 and 1008.16 cm-1 are assigned to stretching vibration of Si(Al)-O, the peaks at 787.56 cm-1 and 761.71 cm-1 are assigned to s”

  Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH DOI: 10.3390/separations9050110
• Acetate confidence 1.0

  “The signal at 1051 and frequency of lower error in the loading estimates which 1008cm-1 corresponding to the glycosidic (C-O-C) stretchsupports the hypothesis that PCR provides better precision ing cannot be clearly distinguished due to the”

  Zhou 等 - 2015 - Multivariate Calibration and Model Integrity for W DOI: 10.1155/2015/429846
• Silicon (Si) confidence 1.0

  “We also noticed that the major and strong absorption band at around 1008 cm-1 that corresponds to the asymmetric stretching vibrations of Si-O-T (where T = Si or Al) seen in the SF mix's IR spectrum (Figure 7A) shifted to a lower wavenumber”

  Ahmed 等 - 2023 - Immobilization Approach as a Creative Strategy to DOI: 10.3390/polym15071797
• confidence 1.0

  “(Si-C stretching), 1007.77 (Si-O-Si stretching) and An example of SAM images taken from PU coated cm-1 1256.96 (CH symmetric deformation of Si-CH 3).”

  Butruk 等 - 2011 - Simple method of fabrication of hydrophobic coatin DOI: 10.2478/s11532-011-0094-7
• Borate confidence 1.0

  “The second band at 1008 pointed to the B-O bond stretching of the tetrahedral BO 4.”

  Structural, optical, and cytotoxicity studies of laser irradiated ZnO doped borate bioactive glasses DOI: 10.1038/s41598-023-34458-4