Acetyl — FTIR absorption peaks and assignments

Quick answer

Acetyl is usually assigned by looking for a recurring cluster of characteristic peaks rather than one exact textbook number. The table below shows where the literature most often places this group in FTIR, ranked by accumulated evidence.

Characteristic FTIR peaks for Acetyl

Showing the 30 best-supported peaks of 73 total for Acetyl.

Spectrum logic

A functional-group assignment becomes more confident when several expected bands appear together. Use this page to find the strongest-supported peaks, then confirm that the same sample exhibits a coherent pattern rather than a single isolated hit.

Real-world usage

These pages are useful for unknown material analysis, peak explanation in reports, polymer troubleshooting, and verifying whether a candidate material family is chemically plausible.

Common mistakes

• Using one functional-group page as a complete material verdict without checking the rest of the spectrum.
• Assuming the strongest band is always the most diagnostic one.
• Forgetting that processing, additives, aging, and mixtures can shift or broaden expected peaks.

Verification advice

Use DSC, GC-MS, or TGA when several material families share similar bands or when mixture effects make the FTIR assignment uncertain.

Literature behind these assignments

• 2886 cm⁻¹ confidence 1.0

  “The peak component in the composite fibers, therefore the absorption intensity of modified wood pulp was appeared at cm-1 peak at 2886 and 1459 which corresponds to the cm-1 1746 due to grafting of acetyl groups.”

  Awal 等 - 2012 - Thermal analysis and spectroscopic studies of elec DOI: 10.1007/s10973-011-1875-0
• 1089 cm⁻¹ confidence 1.0

  “The sharp band at 1089 corresponds The PVA used in this work were obtained in powder form to C-O stretching of acetyl group present on the PVA back from M/s.”

  Bhajantri 等 - 2006 - Microstructural studies on BaCl2 doped poly(vinyl DOI: 10.1016/j.polymer.2006.03.054
• 1030 cm⁻¹ confidence 1.0

  “The band at 1518 is generally ascribed to cm-1 C-H bending vibration and the band at 1030 assigned to C-O stretching of acetyl groups present in PVA.”

  Devi 等 - 2019 - Structural and optical studies on PVA capped SnS f DOI: 10.1088/1674-4926/40/5/052101
• 1730 cm⁻¹ confidence 1.0

  “Hemicelluloses were the first to degrade as proved by the initial decrease cm-1 of the 1730 peak due to the breaking of acetyl groups in xylan.”

  Esteves 等 - 2013 - CHEMICAL CHANGES OF HEAT TREATED PINE AND EUCALYPT DOI: 10.4067/S0718-221X2013005000020
• 3300 cm⁻¹ confidence 1.0

  “It is possible (NS, LAS, and HAS), which can be confirmed by the that HAS sample has a more electronegative surface cm-1 peak at 3300 which is commonly attributed to than LAS sample, as more acetyl groups were incorstretching of -OH groups”

  Felipe Tirado 等 - 2017 - EVALUATION OF THE COAGULANT CAPACITY OF STARCH OBT DOI: 10.20937/RICA.2017.33.esp01.11
• 1149 cm⁻¹ confidence 1.0

  “At 1149.37 the sharp band was observed which corresponded to the C-O stretching of acetyl group present on the back bone of PVA.”

  Gopinath 等 - 2023 - Mechanical, structural and optical properties of p DOI: 10.15251/JOR.2023.191.23
• 1435 cm⁻¹ confidence 1.0

  “In contrast, the paramecompletely cm-1 introduction of acetyl groups weakens the formation of interand ters including peaks associated with the C O at 1733 and cm-1, hydrogen bonds and gives rise to the disruption of intramolecular 1435 and”

  Synthesis, optimization and characterization of acetylated corn starch with the high degree of substitution DOI: 10.1016/j.ijbiomac.2013.04.080
• 1242 cm⁻¹ confidence 1.0

  “cm-1 The peak at 1242 of raw spectrum was EFB The moisture content (2-5%) seems to be necessary for attributed to a waxy acetyl group of hemicellulose ester the best reaction.”

  Jahi 等 - 2020 - Empty Fruit Bunch Cellulose based Sorbent for Oil DOI: 10.17576/jsm-2020-4909-29