What absorbs at 904 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 904 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 904 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

• Alkyl C-H 신뢰도 1.0

  “The peak at 904 corresponds to the C - H bond deformation or to the C - N cm-1 C bond of the protein backbone.”

  Depciuch 和 Parlinska-Wojtan - 2018 - Comparing dried and liquid blood serum samples of DOI: 10.1016/j.jpba.2017.11.074
• Silicon (Si) 신뢰도 1.0

  “2 X x film indicates that the N atoms were incorporated in the a-Si due to 766-884cm-1 904cm-1 nitridation.”

  Growth of silicon nitride by nitridation of amorphous silicon at low temperature in hot-wire CVD DOI: 10.1016/j.mssp.2017.05.015
• Oxygen heterocycle 신뢰도 1.0

  “In addition, after modification, FTIR peaks that assigned to the epoxy ring (844 cm-1 and 904 cm-1) were decreased.”

  Mazlan 和 Abu Hanifah - 2014 - Synthesis and Effect of Modification On Methacylat DOI: 10.1063/1.4895206
• Oxygen heterocycle 신뢰도 1.0

  “Explicit assignment in text.”

  New reactive isoeugenol based phosphate flame retardant: toward green epoxy resins DOI: 10.1021/acssuschemeng.9b02629
• Acetate 신뢰도 1.0

  “1636 cm-1, assigned to C-O stretching vibration and on the preparation route of the C-CPS/W hybrids, one about 904 cm-1, which could be assigned to the conformation change in the secondary structure et al.”

  Radev 等 - 2009 - OrganicInorganic bioactive materials Part II in DOI: 10.2478/s11532-009-0076-1
• Acetate 신뢰도 1.0

  “The satellite band at 904 cm-1 is due to the C=O*”

  Plasticizers and Salt Concentrations Effects on Polymer Gel Electrolytes Based on Poly (Methyl Methacrylate) for Electrochemical Applications DOI: 10.3390/gels8060363
• Silicon nitrogen 신뢰도 1.0

  “The broad absorption bands due to Si-O (1026 Si-N (904 cm-1)”

  Porous Silicon Oxycarbonitride Ceramics with Palladium and Pd2Si Nanoparticles for Dry Reforming of Methane DOI: 10.3390/polym14173470