What absorbs at 1144 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1144 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.

Possible functional-group assignments

Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.

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 1144 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.

Literature behind these assignments

• Acetate confidence 1.0

  “The band at cm-1 1144 resulted from the stretching vibrations of -C-O ester groups (Guillén & Cabo, cm-1 2000).”

  Prediction of peroxide value in omega-3 rich microalgae oil by ATR-FTIR spectroscopy combined with chemometrics DOI: 10.1016/j.foodchem.2017.01.013
• Hydrogen bond confidence 1.0

  “The Hydrogen bond formation is predicted to be with the hydroxyl -1 peak at 1144 cm is ascribed to oxygen and sulfur double bond of amine groups.”

  A case study of poly (aryl ether sulfone) hemodialysis membrane interactions with human blood: Molecular dynamics simulation and experimental analyses DOI: 10.1016/j.cmpb.2020.105742
• Alkyl C-H confidence 1.0

  “Stretching 1144 1012 1050 1039 H-C-H deformation”

  Suardy 等 - 2020 - Analysis and Characterization of Microplastic from DOI: 10.17576/jsm-2020-4909-21
• Acetate confidence 1.0

  “For both paints, the contribution at 1144 and 1111 cm-1 attributed to C-O stretching disappears.”

  Evaluation of the Impacts of Four Weathering Methods on Two Acrylic Paints: Showcasing Distinctions and Particularities DOI: 10.3390/coatings9020121
• Acetate confidence 1.0

  “the peak at 1143.57 could be assigned to triterpene compounds (C-O);”

  Ganoderma lucidum-Mediated Green Synthesis of Silver Nanoparticles with Antimicrobial Activity DOI: 10.3390/ma16124261
• confidence 1.0

  “The very cm-1 wavenumbers correspond to C-F stretching vibrations of the PTFE strong absorption bands near 1144 and 1204 cm-1 are assigned to the symmetric vibrations of two ether backbone in Nafion.”

  Irmawati 等 - 2016 - Polarization Losses Under Dynamic Load Cycle Using DOI: 10.1063/1.4941635
• confidence 1.0

  “The peak at 177 cm-1 is with the highest intensity are 101, 177, 1144, 1456, and 2923 attributed to Zn-N bond vibrations, the peak at 682 cm-1 is attributed to imidazolate ring puckering vibrations, the peak at 1144 cm-1 is attributed to Zn”

  Biocatalysts Synthesized with Lipase from Pseudomonas cepacia on Glycol-Modified ZIF-8: Characterization and Utilization in the Synthesis of Green Biodiesel DOI: 10.3390/molecules27175396
• Acetate confidence 1.0

  “The signals at 1243 and 1144 cm-1 were assigned to the C-O-H”

  Mucilage from Yellow Pitahaya (Selenicereus megalanthus)Fruit Peel: Extraction, Proximal Analysis, and Molecular Characterization DOI: 10.3390/molecules28020786