What absorbs at 788 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 788 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.

가능한 작용기 할당

순위는 단일 권위 규칙이 아닌 축적된 문헌 증거를 반영합니다. 항상 샘플 상황에 대해 확인하세요.

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 788 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.

이 할당의 배경이 되는 문헌

• Silicon-oxygen (Si-O) 신뢰도 1.0

  “Various peaks 323 cm-1), were detected which correspond to O-Si-O stretching vibrations of silica group (788 -O324 cm-1), CH/C-O stretch for the O-CH and C-OH of sugar unit in cellulose (1034 OH in-plane 325”

  Balan 等 - 2021 - Esterification of residual palm oil using solid ac DOI: 10.1016/j.jtice.2012.07.001.
• 신뢰도 1.0

  “cm-1 The peak of 3372 denoted the vibrations of the silanol functional group and the peak at 986 cm-1 cm-1 due the Si-O stretching vibration while the peak at 788 represented calcium [43-44].”

  Design and synthesis of a new topical agent for halting blood loss rapidly: A multimodal chitosan-gelatin xerogel composite loaded with silica nanoparticles and calcium DOI: 10.1016/j.colsurfb.2020.111454
• Silicon (Si) 신뢰도 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
• 신뢰도 1.0

  “In addition, two typical peaks located at 788 and 1260 attribute to N-H and C-N”

  Improvement of anti-corrosion performance of an epoxy coating using hybrid UiO-66-NH2/carbon nanotubes nanocomposite DOI: 10.1038/s41598-022-14854-y
• Alkene (C=C) 신뢰도 1.0

  “The peaks at 788 and 796 are associated with the vibration of the the stretching vibrations of the C=C and C=O bonds respectively.”

  Influence of the Alcoholic/Ethanolic Extract of Mangifera indica Residues on the Green Synthesis of FeO Nanoparticles and Their Application for the Remediation of Agricultural Soils DOI: 10.3390/molecules26247633
• 신뢰도 1.0

  “Functional Group 601.89 620.59 Bending vibration of Si-O 788.05 788.14”

  Data extraction of nano silica as a potential filler in nanocomposites from rice husk ash with ballmill and coprecipitation methods DOI: 10.1016/j.dib.2022.108656
• Silicon (Si) 신뢰도 1.0

  “Moreover, a Si-OH peak at 943 was documented, and the vibrational band ver, a Si-OH peak at 943 cm-1 was documented, and the vibrational band at 788 cm-1 corcm-1 at 788 corresponds to the Si-O-Si group.”

  Sustainable Remedy Waste to Generate SiO2 Functionalized on Graphene Oxide for Removal of U(VI) Ions DOI: 10.3390/su14052699
• 신뢰도 1.0

  “Al-OH bending 835 Al-Mg-OH deformation 835 Al-Mg-OH deformation 788 Si-O stretching of quartz 788”

  SO42-/Sn-MMT Solid Acid Catalyst for Xylose and Xylan Conversion into Furfural in the Biphasic System DOI: 10.3390/catal7040118