What absorbs at 1184 cm⁻¹ in an FTIR spectrum?

Quick answer

A band near 1184 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.

Возможные назначения функциональных групп

Ранжирование отражает накопленные литературные данные, а не единственное авторитетное правило. Всегда проверяйте в контексте вашего образца.

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 1184 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.

Литература, лежащая в основе этих назначений

• Alkyl C-H достоверность 1,0

  “- - - - - 1265 1267 1263 Amino acid, CH and CH2 vibrations 1184 1199 -”

  Doerr 等 - 2008 - Far infrared spectroscopy on hemoproteins A model DOI: 10.1016/j.vibspec.2008.02.003
• Aromatic ring достоверность 1,0

  “The main Raman lines observed in In order to show the vibrational properties of the composites resulting from the elecare attributed to the vibrational modes caused by the deformation of the benzene ring, Figure 5a-c have maxima at ~415-498”

  The Photoluminescence and Vibrational Properties of Black Phosphorous Sheets Chemically/Electrochemically Functionalized in the Presence of Diphenylamine DOI: 10.3390/polym14214479
• Acetate достоверность 1,0

  “Furthermore, the cm-1 cm-1 1184 and 1038 bands could be attributed to the C-O stretching vibrations of 1184 cm-1 and 1038 cm-1 bands could be attributed to the C-O stretching vibrations of alcohols, esters, ethers and carboxylic acids from”

  Green Synthesis and Characterization of Silver Nanoparticles Using a Lythrum salicaria Extract and In Vitro Exploration of Their Biological Activities DOI: 10.3390/life12101643
• Acetate достоверность 1,0

  “The thermal properties such as glass transition and are correpeaks at = temperature (T g), melting temperature (T m) and enthalpies O and -CH 2, the sponding to the characteristic peaks of C 1184∼1190cm-1 m) were measured using a Perkin-Elm”

  Fang 等 - 2009 - Synthesis of Poly(L-lactide) via Solvothermal Meth DOI: 10.1155/2009/929732
• Carbohydrate достоверность 1,0

  “weighted peak around 1270 is related to guaiacyl ringin in The positive weighted peaks around cm-1 cm-1 1108 and 1062 and the negative weighted peaks around 1184 are related to hemicellulose, while the cm-1 positive weighted peaks around 99”

  Soil-applied selenite increases selenium and reduces cadmium in roots of Moringa oleifera DOI: 10.1038/s41598-020-77350-1
• Aromatic ring достоверность 1,0

  “Bands corresponding to the surfactant SDBS are also present in the figure, such as the S=O bonding vibrations present at 1184 cm-1 and 1043 cm-1, the cm-1 cm-1, in the figure, such as the S=O bonding vibrations present at 1184 and 1043 arom”

  Study of Melamine-Formaldehyde/Phase Change Material Microcapsules for the Preparation of Polymer Films by Extrusion DOI: 10.3390/membranes12030266
• Amide достоверность 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 достоверность 1,0

  “1184cm-1 Δ𝐼 (a stretching vibration of the C-O group of lipid The linear increase in the value of the parameter in”

  Oleszko 等 - 2015 - Application of FTIR-ATR Spectroscopy to Determine DOI: 10.1155/2015/245607