What absorbs at 902 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 902 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.

可能的官能团归属

排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。

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 902 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.

这些分配背后的文献

• 置信度 1.0

  “FTIR spectra hydrophobic state resulted from surface treatment involving of Hybrid Al 2O 3-SiO shows additional peak at 902, 850, 2 cm-1”

  Damayanti - 2010 - Preparation of superhydrophobic PET fabric from Al DOI: 10.1007/s10971-010-2271-0
• Oxygen heterocycle 置信度 1.0

  “ALG rapidly decomposed into monomers and evenstretching of the epoxy ring at 902 and seen in this study”

  Hussin 等 - 2020 - Taguchi design-assisted immobilization of Candida DOI: 10.1016/j.enzmictec.2019.109506
• Phosphate (PO4) 置信度 1.0

  “Symmetric vibrations and asymmetric stretching modes of non-bridging or P-O”

  Effects of titanium nanoparticles on self-cleaning and structural features of zinc-magnesium-phosphate glass DOI: 10.1016/j.materresbull.2015.11.022
• Acetate 置信度 1.0

  “Polymers2022,14,3100 4of14 Polymers 2022, 14, x FOR PEER REVIEW 4 of 14 presence of the epoxy group is displayed by the characteristic absorption bands at 902 and cm-1, 853 which areattributed to stretching of C-O-C and C-O of oxirane group”

  Synthesis Characterization and Highly Protective Efficiency of Tetraglycidyloxy Pentanal Epoxy Prepolymer as a Potential Corrosion Inhibitor for Mild Steel in 1 M HCl Medium DOI: 10.3390/polym14153100
• Carbohydrate 置信度 1.0

  “Finally, at 902 it presents a peak that is associated with the absorption of β-glycosidic the bonds between glucose units in cellulose [36-40].”

  Improvement in the Carbonation Resistance of Construction Mortar with Cane Bagasse Fiber Added DOI: 10.3390/ma14082066
• Phosphate (PO4) 置信度 1.0

  “(2:1) sample at 298 cm-1, (2:1) sample at 1266 and 902 cm-1, corresponding to the P=O bond and P-O bond from P=O 1266 and 902 corresponding to the bond and P-O bond from polyphosphoric acid produced 299 polyphosphoric acid produced by the d”

  Synthesis of a Carrageenan–Iron Complex and Its Effect on Flame Retardancy and Smoke Suppression for Waterborne Epoxy DOI: 10.3390/polym11101677
• Acetate 置信度 1.0

  “Regarding the fingerprint area, the peaks at 1022 and 902 cm-1 were mainly associated with C-O and P-O stretching Polymers2019,11,947 5of13”

  Degradation of Metal-Organic Framework Materials as Controlled-Release Fertilizers in Crop Fields DOI: 10.3390/polym11060947
• Phosphate (PO4) 置信度 1.0

  “The IR band at 902 is assigned to the asymmetric bridging P-O bond H”

  Zhang 等 - 2010 - Leaving Group Activation and Pyrophosphate Ionic S DOI: 10.1021/ja107806j.