Methoxy (OCH3) — FTIR absorption peaks and assignments

Quick answer

Methoxy (OCH3) 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 Methoxy (OCH3)

Showing the 30 best-supported peaks of 1369 total for Methoxy (OCH3).

Possible materials

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

• 853 cm⁻¹ confidence 1.0

  “In ATMC the 1289cm-1 ringbreathingmodeisobservedat853cm-1 1351 and corresponds to the C O stretching mode.”

  Fourier transform infrared and Raman spectral assignments and analysis of 7-amino-4-trifluoromethylcoumarin DOI: 10.1016/j.saa.2006.09.044
• 1027 cm⁻¹ confidence 1.0

  “1137 C-O stretching (ST) 1027 carbohydrate 939”

  The Properties of Brown Marine Algae Sargassum turbinarioides and Sargassum ilicifolium Collected From Yogyakarta, Indonesia DOI: 10.14499/indonesianjpharm30iss1pp43
• 1037 cm⁻¹ confidence 1.0

  “From FTIR cm(cid:0) 1 C-O-C analysis, observed peaks around 1037 represented the stretching vibrations of the saccharide found in pectin and glycerol.”

  Optimization of citron peel pectin and glycerol concentration in the production of edible film using response surface methodology DOI: 10.1016/j.heliyon.2023.e13724
• 2884 cm⁻¹ confidence 1.0

  “The characteristic absorption modes observed in the FTIR spectrum at the wavenumbers ~732 , ~842, ~950, ~1048 , ~ 1113, ~ 1244 ,~ 1351,~ 1432, ~ 1468, ~2884 cm-1 6-), and ~2939 are attributed to C-Clst., 𝑠(PF (C-O-C)st., ν(COC) s,w(CH s, δ(”

  Arya 等 - 2018 - Effect of variation of different nanofillers on st DOI: 10.1007/s11581-016-1784
• 1114 cm⁻¹ confidence 1.0

  “Table 2 shows the shift in C-O-C cm-1 cm-1 band occurring at 1114 towards lower wavenumber side to 1112 on the addition of salt in polymer”

  Arya 和 Sharma - 2018 - Structural, microstructural and electrochemical pr DOI: 10.1007/s11581-017-2364-7
• 1053 cm⁻¹ confidence 1.0

  “cm-1 to the peak intensity which can be observed in 1312 The region at 1053 corresponds to -C-O-C stretching bonds whereas the spectra with wavenumber below cm-1”

  Synthesis and Characterization of Zinc Oxide Nanoparticles Using Acacia caesia Bark Extract and Its Photocatalytic and Antimicrobial Activities DOI: 10.3390/catal11121507
• 1142 cm⁻¹ confidence 1.0

  “42 43 cm-1 In the spectrum of PMMA, there is a distinct absorption band at 1142 which is due to O-CH 3 44”

  Electrosprayed PMMA microcapsules containing green soybean oil-based acrylated epoxy and a thiol: a novel resin for smart self-healing coatings DOI: 10.1088/1361-665X/ab9754
• 1098 cm⁻¹ confidence 1.0

  “The production of biodiesel from oil via a C-O transesterification reaction is monitored by the intensity of the ester cm-1), peak (1098 whereas the mixing of biodiesel and petroleum-based cm-1).”

  Quantitative Investigations of Biodiesel Fuel Using Infrared Spectroscopy: An Instrumental Analysis Experiment for Undergraduate Chemistry Students DOI: 10.1021/ed101097n