What absorbs at 929 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 929 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 929 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

• Acetate 신뢰도 1.0

  “- 995 999 1003 C-O stretching of cornstarch 929 -”

  Jothi 等 - 2021 - Proton conducting polymer electrolyte based on cor DOI: 10.1007/s11581-020-03792-2
• 신뢰도 1.0

  “cm-1 ~929 Phonon sideband spectrum confirms the phonon energy ~920 for these glasses Si-O-.”

  Development of Eu3+ doped Li2O-BaO-GdF3-SiO2 oxyfluoride glass for efficient energy transfer from Gd3+ to Eu3+ in red emission solid state device application DOI: 10.1016/j.jlumin.2018.07.009
• Acetate 신뢰도 1.0

  “cm-1), cm-1), cm-1), (1450.65 C-N stretching (1394.53 amide III or C-N stretching (1235.67 CO-O-C cm-1), cm-1) symmetric stretching vibration (1073.59 stretching vibration of C-O groups ( 928.78 and”

  Encapsulation of olive leaf phenolics within electrosprayed whey protein nanoparticles; production and characterization DOI: 10.1016/j.foodhyd.2019.105572
• Alkyl C-H 신뢰도 1.0

  “FTIR(KBr, 1772, 1720(imideIgroup)1507(stretchingoftrisubstitutedbenzenering), 1386 (imide II, CN stretching), 1209 (COC antisymmetric stretching), 929 (out-of-plane CH bending).”

  Corrosion Resistance of Mild Steel Coated with Phthalimide-Functionalized Polybenzoxazines DOI: 10.3390/coatings10111114
• 신뢰도 1.0

  “cm-1 (C-N in-plane deformation), 1201 (Py ring vibration), 1097 (asymmetric S(=O) 2 cm-1 stretching vibration), 1049 (symmetric S(=O) stretching and Py ring C-H deformation 2 cm-1 cm-1 vibration), 967 (C-C out of plane ring deformation vibr”

  New conductive copolymer membranes via track-etched PC templates for biological media ultra-filtration DOI: 10.1016/j.nimb.2007.08.066
• Alkyl C-H 신뢰도 1.0

  “1603 1595 1544 1544 1551 NH bend coupled with CN stretch Amide II - - 1453 1438 1446 CH2 bending (scissors) vibration wag of proline and glycine 1378 1386 1378 1378 1394 CH2 Amide III - - 1229 1229 1236 NH bend stretch coupled C-N stretch 1”

  Characterization of gelatin/chitosan ploymer films integrated with docosahexaenoic acids fabricated by different methods DOI: 10.1038/s41598-019-44807-x
• 신뢰도 1.0

  “The peaks 1086 results from stretching amine, shows that no absorption peak was observed in 0.5, 1, and 4 h and five peaks at 929,773,849,715 1035 from C-N stretching”

  Gupta 等 - 2018 - Effective Antimicrobial Activity o Green ZnO Nano DOI: 10.3389/fmicb.2018.02030
• Alkyl C-H 신뢰도 1.0

  “(cm-1) Frequency Band Assignment Species C-H 929 out-of-plane deformation 1018 Ring deformation 1081 Furfural 1156 =C-O-C= ring vibration 1279 1570 C=C stretches 1696 C=O aldehyde stretch 1671 C-O 1163 acid stretch vibration 1369 CH symmetr”

  Solubility Temperature Dependence of Bio-Based Levulinic Acid, Furfural, and Hydroxymethylfurfural in Water, Nonpolar, Polar Aprotic and Protic Solvents DOI: 10.3390/pr9060924