What absorbs at 817 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 817 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

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 817 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.

これらのアサインの根拠となる文献

• Aromatic ring 信頼度 1.0

  “Weak peak appears at 817 in BA-Coir/(Py-Acetone) and Coir-BA (Py-Acetone)-C-BPO due to two adjacent aromatic Ccm-1 H bending vibration of lignin component.”

  Rout 等 - 2017 - A green approach to produce silver nano particles DOI: 10.1016/j.surfin.2017.03.004
• Alkyl C-H 信頼度 1.0

  “As regards the broad band close to 568 cm-1, cm-1, cm-1, cm-1, cm-1 1087 2358 1191 1448 817 cm-1 and 3200 were attributed to stretching vibrations of C-H, C O, B-O and O-H bonds, respectively.”

  Zhang 等 - 2019 - Synthesis of TiB2 Powders with Hexagonal Morpholog DOI: 10.1166/jnn.2019.16750
• Acetate 信頼度 1.0

  “some peaks, situated at 817 and 859 were assigned to the cm-1 (xi) C-O bond from cyclohexane [33];”

  Bita 等 - 2023 - Diester Chlorogenoborate Complex A New Naturally DOI: 10.3390/inorganics11030112
• C c single bond 信頼度 1.0

  “881 sidic links, characteristic of polysaccharides structure ring 852 ------ Stretching C-C of ethyl 817”

  Flores-Hernandez 等 - 2021 - Synthesis of a Biodegradable Polymer of Poly (Sodi DOI: 10.3390/polym13040504
• N-O bond 信頼度 1.0

  “structure.18 WS, initially no peaks were detected at 817 however, lignin-50 °C, Figure 6 shows the SEM images of the wt % WS after pyrolysis of WS at 300, 500, 700, and 900 the different foams fabricated at temperatures, for example, Figure”

  Gupta 等 - 2020 - On the Design of Novel Biofoams Using Lignin, Whea DOI: 10.1021/acsomega.0c00721
• C c single bond 信頼度 1.0

  “The band of 817.23 was known as the stretching mode of C-C.”

  Harati 等 - 2022 - Enhanced photocatalytic activity of Fe2O3@ZnO deco DOI: 10.1007/s40201-021-00758-y
• Acetate 信頼度 1.0

  “the spectra of the silicon substrate, while that for PMMA on the klarite surface was seen at cm-1 cm-1 cm-1 622 due to C-C-O stretching, 817 (C-O-C symmetric stretching), 1000 E P”

  Kundu 等 - 2021 - Identification and removal of microand nano-plas DOI: 10.1016/j.cej.2021.129816.
• Alkyl C-H 信頼度 1.0

  “the 809-, 817-, 809-, 820-cm-1 , 809-, 817-, and 820-cm-1 peaks are δCH (out-of-plane deformation) of the triazine compound;”

  Li 等 - 2019 - Blends of Cyanate Ester and Phthalonitrile-Polyhed DOI: 10.3390/polym11010054