What absorbs at 814 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 814 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.

Möjliga identifieringar av funktionella grupper

Rankingen speglar ackumulerade litteraturbevis, inte en enda auktoritativ regel. Bekräfta alltid mot din provkontext.

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 814 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.

Litteratur bakom dessa identifieringar

• Alkyl C-H förtroende 1,0

  “Meanwhile, the peak of 1160.83 is the fingerprint for stretching the C-O ester At the same time, cm-1 the peak of 813.54 represents the alkane group's fingerprints.”

  Synthesis of magnetic nanocarbon using palm oil as the green precursor via microwave-assisted arc for wastewater treatment DOI: 10.1038/s41598-022-21982-y
• Carboxyl (COOH) förtroende 1,0

  “9 depicts the two possible pathways of formic acid of the H 2BDC Raman ring breathing doublet bands at 814 and cm(cid:3)1”

  Embrechts 等 - 2020 - In situ Raman and FTIR spectroscopic study on the DOI: 10.1039/c9ra09968a
• Silicon (Si) förtroende 1,0

  “cm(cid:4)1 fluorescence (SieO (OeSieO suggests that blueberry extract produces a phenombands at 999 stretching) and 814 enon in clay samples, thus limiting the detection of the spectra asymmetric stretching) due to changes in the Si environ”

  Nano-clays from natural and modified montmorillonite with and without added blueberry extract for active and intelligent food nanopackaging materials DOI: 10.1016/j.matchemphys.2017.03.052
• förtroende 1,0

  “The peaks at 814 and 473 cm-1 are attributed to the amorphous Al-O stretching vibration cm-1 The peaks at 814 and 473 are attributed to the amorphous Al-O stretching vibration and Si-O-Si flexion, respectively [12].”

  Metakaolin-Based Geopolymer with Added TiO2 Particles: Physicomechanical Characteristics DOI: 10.3390/coatings7120233
• Acetate förtroende 1,0

  “at 2927 and 1448 (CH2 group) meanwhile the tea tree at 3340 Biotersus spectra show these common bands 2920 (CH2 asymmetric bending), 1452 (CH2 bending), 2047, cm-1 1255 (C-O stretching vibration), 814 (CH), and 658 while YOCOCOIL shows band”

  In-Situ Comparative Study of Eucalyptus, Basil, Cloves, Thyme, Pine Tree, and Tea Tree Essential Oil Biocide Efficacy DOI: 10.3390/mps5030037
• Alkene (C=C) förtroende 1,0

  “This process is also confirmed cm-1 cm-1 (d [bands at 814 and 936 =C-H), at 1650 by the lack of such a peak in the case of copolymers cm-1 (m (m C=C) and at 3105 =C-H)], aldehydes, especially”

  Synthesis and thermal properties of parent and modified DMN–co-GMA copolymers DOI: 10.1007/s10973-018-7162-6
• Silicon-oxygen (Si-O) förtroende 1,0

  “Addicm-1 bands at 3400 and 1637 are due to the O-H group on the surface of nano-SiO 2, and tionally, the bands at 471 cm-1 and 814 cm-1 in nano-SiO2 spectrum represent Si-O bending”

  Preparation and Characterization of Novel Microgels Containing Nano-SiO2 and Copolymeric Hydrogel Based on Poly (Acrylamide) and Poly (Acrylic Acid): Morphological, Structural and Swelling Studies DOI: 10.3390/ma15144782
• Acetate förtroende 1,0

  “The presence of sulfate in both samples is confirmed by the bands at 1249, 1035, and 814 cm-1, which correspond to the vibrations of asymmetric S = O stretching, symmetric C-O associated with a C-O-SO group, and C-O-S of the sulfate groups”

  Silver Nanoparticles Containing Fucoidan Synthesized by Green Method Have Anti-Trypanosoma cruzi Activity DOI: 10.3390/nano12122059