What absorbs at 809 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 809 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.

Possibili assegnazioni di gruppi funzionali

La classifica riflette le prove bibliografiche accumulate, non una singola regola autorevole. Conferma sempre nel contesto del tuo campione.

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 809 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.

Letteratura dietro queste assegnazioni

• Metal oxygen affidabilità 1,0

  “and iii)the appearanceof newRaman lines at 809 cm-1, 710 and 809 which are attributed to the W-O vibrational mode in WO [28].”

  Single-walled carbon nanotubes functionalized with polydiphenylamine as active materials for applications in the supercapacitors field DOI: 10.1016/j.diamond.2012.12.006
• Silicon carbon affidabilità 1,0

  “Correspond to Si-C bonds.”

  Optical and photoelectrochemical properties of nitrogen-doped a-SiC thin films deposited by reactive DOI: 10.1080/2374068X.2021.1890420
• Metal oxygen affidabilità 1,0

  “10 a-b), peaks at 809, 811 and 812 cm-1 mixtures, MNP-PCP shifted to 814 which assigned to As-O [35].”

  Enhanced arsenic (iii) adsorption from aqueous solution by magnetic pine cone biomass DOI: 10.1016/j.matchemphys.2018.09.067
• affidabilità 1,0

  “The cm-1 intense band at 1069 corresponds to the Si-O-Si symmetric stretching vibration, cm-1 whereas the Si-O-Si anti-symmetric stretching band is observed at 809 [24,25].”

  Vibrational spectroscopic study of pure and silica-doped sulfonated poly(ether ether ketone) membranes DOI: 10.1016/j.saa.2014.12.004
• Alkyl C-H affidabilità 1,0

  “The spectrum of porous graphene nanosheets is represented by the cm-1, cm-1, cm-1 cm-1, peaks at 809 1636 2344 and 3309 resulting from C-H bonding, C=C conjugation, C-N band and N-H extending vibrations.”

  An Amperometric Acetylcholine Biosensor Based on Co-Immobilization of Enzyme Nanoparticles onto Nanocomposite DOI: 10.3390/bios13030386
• Acetate affidabilità 1,0

  “[60] assigned the spectral features of pure chlorogenic acid isomer standards as follows: The peak at cm-1 cm-1 809 was attributed to cyclohexane C-O twisting;”

  Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112
• affidabilità 1,0

  “ESI-MS molecular-ion peak 809.21, corresponding to H+ + 1H [Zn(L3) ].”

  Gusev 等 - 2020 - Synthesis, Photoluminescence and Electrical Study DOI: 10.3390/ma13245698
• Acetate affidabilità 1,0

  “cm-1) cm-1) 1330-1326 [30], a C-O-C band center position (1025 [31], and C-O-C vibrations lignin, there is a syringyl (S) at 809 cm-1.”

  Mesoporous Manganese Oxide/Lignin-Derived Carbon for High Performance of Supercapacitor Electrodes DOI: 10.3390/molecules26237104