What absorbs at 1219 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1219 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.

Mögliche Funktionsgruppenzuweisungen

Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.

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 1219 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.

Literatur hinter diesen Zuweisungen

• Acetate Vertrauen 1,0

  “characteristics ester carbonyl C=O stretch vibration of PMMA was also appeared at 1766 cm-1, cm-1 The stretching modes were detected at 1219 and 703 assigned to C-O and C=O bonds, respectively.”

  Carrier mechanism of ZnO nanoparticles-embedded PMMA nanocomposite organic bistable memory device DOI: 10.1016/j.solidstatesciences.2019.106046
• Vertrauen 1,0

  “Bands depicting amide II were found at 1517, cm-1, 1586, 1514, and 1522 whereas amide III bands were registered at 1221, 1219, 1227, cm-1 and 1229 for all tested protocol extracts (P1, P2, P3, and P4 respectively) (Figure 3B).”

  Comparison of Different Methods for Spongin-like Collagen Extraction from Marine Sponges (Chondrilla caribensis and Aplysina fulva): Physicochemical Properties and In Vitro Biological Analysis DOI: 10.3390/membranes11070522
• Ring structure Vertrauen 1,0

  “The former one (peak D) can be ing, bond at 1219 assigned to the ring vibrations is obascribed to the C=O bonds pertaining to carboxylic groups, served for samples EG and EG-3Ph reg but not for EG-3Ph.”

  Regeneration of expanded graphite electrodes by joined electrochemical and ozone treatment in liquid phase DOI: 10.1007/s10008-018-4098-5
• Amide Vertrauen 1,0

  “Shore A hardness cm-1 (C-O (cis-) bending (rocking)), 1105 (aliphatic saturated cm-1 (C-N CvO Hardness of HMA7 was measured with a handheld Precision ether)), 1282 (secondary amide, III) + (carbocm-1 (C-N Instrument Shore A digital duromete”

  Bhullar 等 - 2021 - Advanced spectroscopy, microscopy, diffraction and DOI: 10.1039/d0py01348j
• S eq o Vertrauen 1,0

  “The absorptions at 1219, decreases, making the more tortuous path by ethanol due cm-1 1076, and 1020 were assigned to the sulfonic acid to inorganic phase presence and possible TiO particles”

  Dutra Filho 等 - 2014 - Nanostructured Polyelectrolytes Based on SPEEKTiO DOI: 10.4322/polimeros.2014.069
• Hydroxyl (O-H) Vertrauen 1,0

  “rR@SrTiO rR@BaTiO (1900 to 900 In contrast, the FTIR spectra of 3-OH-A and 3cm-1, OH-A showed strong absorptions at 1219, 1141, and 1100 and at 1200 and 1091 respectively, due to the presence of H 2SO on the NP surface.”

  Freimann 等 - 2023 - Nanoparticulate Perovskites for Photocatalytic Wat DOI: 10.3390/nano13142094
• Acetate Vertrauen 1,0

  “The peak cm-1 at 1219 could be assigned to the C-O stretching in the ether or alcohol groups [38].”

  Analysis of Chemical Structure and Antibiofilm Properties of Exopolysaccharides from Lactiplantibacillus plantarum EIR/IF-1 Postbiotics DOI: 10.3390/microorganisms10112200
• Acetate Vertrauen 1,0

  “C-C, C=C (aromatic skeleton), stretching C-C, C=C (aromatic skeleton), stretching 1379 1379 - - 1396 1379 1379 - - 1396 - - - 1271 1270 1272 C-O (guaiacyl unit) stretching - - - 1271 1270 1272 C-O (guaiacyl unit) stretching - - - 1219 1221”

  Activation of Magnesium Lignosulfonate and Kraft Lignin: Influence on the Properties of Phenolic Resin-Based Composites for Potential Applications in Abrasive Materials DOI: 10.3390/ijms18061224