What absorbs at 1206 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1206 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 1206 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

  “easily distinguish the present peak from the 1206-cm(cid:3)1 1230cm(cid:3)1 The important result here is that the broad absorption band at peak was not due to oxygen”

  Second Harmonic Vibrational Mode of Substitutional Carbon in Cast-Grown Multicrystalline Silicon DOI: 10.1143/APEX.4.051401
• Acetate 置信度 1.0

  “All the solutions used in NMR C-O stretching 1205.99 1214.82 1396.97 ]C-H experiment were prepared in D 2O solvent.”

  Multi-spectroscopic monitoring of molecular interactions between an amino acid-functionalized ionic liquid and potential anti-Alzheimer's drugs DOI: 10.1039/d0ra06323a
• Carbohydrate 置信度 1.0

  “In turn, in the spectrum of liver, a three 1280cm(cid:3)1, exhibits a specific triplet of bands at 1206, 1238, and bands characteristic for glycogen are observed at 1029, 1078 and however, we do not observe them in the spectra of the homoge”

  Rapid approach to analyze biochemical variation in rat organs by ATR FTIR spectroscopy DOI: 10.1016/j.saa.2013.09.131
• Aromatic ring 置信度 1.0

  “The spectra for amlodipine besylate drug (Figure 4b) show peaks at 2964.69 for C-CH stretching, at 1698.53, 3 cm(cid:1)1 cm(cid:1)1 cm(cid:1)1 1676.11 for ester C=O stretching, at 1493.92 for aromatic skeletal stretching, at 1205.55 for Sul”

  Formulation, optimization, and characterization of amlodipine besylate loaded polymeric nanoparticles DOI: 10.1177/09673911211056154
• Phosphate (PO4) 置信度 1.0

  “1250 Amide III (β-sheet, protein) 1235 Antisymmetric phosphate stretching 1206 C-C stretch, C-H bend”

  Growth substrate induced functional changes elucidated by FTIR and Raman spectroscopy in in-vitro cultured human keratinocytes. DOI: 10.1007/s00216-006-0876-5
• Phosphate (PO4) 置信度 1.0

  “∼430 prominent at and 973 cm-1 for symmetric P-O stretching (ν1), cm-1 for doubly ∼1192 Materials2022,15,2924 7of16 degenerate O-P-O bending (ν2), and 1206 cm-1 for triply degenerate asymmetric P- ∼555 ∼610 O stretching (ν3), and and cm-1 f”

  Ponnusamy 等 - 2022 - Synthesis, Structural, and Mechanical Behavior of DOI: 10.3390/ma15082924
• 置信度 0.9

  “Text: 'bands at 1735 and 1206 were characteristic of C=O and C-O stretching groups'.”

  Bio-plastic (P-3HB-co-3HV) from Bacillus circulans (MTCC 8167) and its biodegradation DOI: 10.1016/j.colsurfb.2011.11.011
• Aromatic ring 置信度 0.9

  “Explicit assignment in text.”

  Synthesis, Characterization, and Antibacterial Potential of Poly(o-anisidine)/BaSO4 Nanocomposites with Enhanced Electrical Conductivity DOI: 10.3390/pr10091878