Sulfonate — FTIR absorption peaks and assignments

Quick answer

Sulfonate 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 Sulfonate

Showing the 30 best-supported peaks of 43 total for Sulfonate.

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

• 3433 cm⁻¹ confidence 1.0

  “Then, the functional group of the cm-1 of the sulfonated group SPEEK was determined using Fourier transfer infrared (FTIR) showed O-H vibration at 3433 (SO2-OH).”

  Hasbullah 等 - 2016 - Synthesis and Characterizations of Electrospun Sul DOI: 10.1063/1.4948867
• 1402 cm⁻¹ confidence 1.0

  “There are three vibrations at 1402, 1330, cm-1 and 1079 due to S=O stretching, the sulfonate group (SO 3) as it is connected to the 10”

  Power-Dependent Nonlinear Optical Behaviours of Ponceau BS Chromophore at 532 nm via Z-Scan Technique DOI: 10.1016/j.jphotochem.2020.112574
• 1052 cm⁻¹ confidence 1.0

  “During fuel cell operation, an oxyintensity of peaks in this region for the nanocomposite gen reduction reaction can proceed through two eleccm-1 membrane.61 Also, the peaks at 1052 and 1074 were trons pathway (ie, incomplete reduction) in”

  Simultaneous improvement of ionic conductivity and oxidative stability of sulfonated poly(ether ether ketone) nanocomposite proton exchange membrane for fuel cell application DOI: 10.1002/er.5094
• 1710 cm⁻¹ confidence 1.0

  “Moreover, the peak at 1710 which is related to the vibration of the C = O bonds, is more intense in the sulfonated lignins compared to RL [45].”

  Microsoft Word - Zadeh_ Valorization of bagasse alkali lignin to water-soluble derivatives through chemical modification_AAM.docx DOI: 10.1016/j.rser.2016.10.082
• 3373 cm⁻¹ confidence 1.0

  “The peaks observed at 3373, 1221, 1037, 1157, 924 and 844 cm-1 can be attributed cm-1 1356-1374 attributed to sulphate (SO 3) group stretching in 1.5-3% CARR:SA (1:0) wafers.”

  Akiyode 和 Boateng - 2018 - Composite Biopolymer-Based Wafer Dressings Loaded DOI: 10.3390/polym10080918
• 1190 cm⁻¹ confidence 1.0

  “the peaks at 1190 cm-1 cm-1 and 985 can be assigned to the asymmetric and symmetric stretching of SO 3.”

  Anis 等 - 2023 - Studies on Polybenzimidazole and Methanesulfonate DOI: 10.3390/polym15132821
• 1055 cm⁻¹ confidence 1.0

  “at 1055 cm-1 observed in the IR spectra is characteristic for the stretching vibrations of SO3 13C The synthesized SPNBIs were examined by solid-state NMR spectroscopy groups in sulfonic acids.”

  One-Step Synthesis of Functional Sulfonated Polynaphthoylenebenzimidazoles for Biosensing Applications DOI: 10.3390/app13021073
• 1123 cm⁻¹ confidence 1.0

  “The S-O symCySO 2-S-Cy (1121 was found for keratin hydrolysates at 1121.9-1123.3 The cm-1 metric stretch band attributed to Cy-S-SO3 (Bunte salt) at 1015.8-1021.1 cm-1 and S-O S-O symmetric stretch band attributed to Cy-S-SO (Bunte salt) at”

  Gaidau 等 - 2021 - Wool Keratin Hydrolysates for Bioactive Additives DOI: 10.3390/ma14164696