| ATR-IR | The characteristic carboxylic acid C=O band near ~1700 cm⁻¹ was absent; prominent absorptions were observed in the ~1400–1500 cm⁻¹ region together with bands in the ~900–950 cm⁻¹ region, consistent with CO₂-derived inorganic salts such as oxalate- and carbonate-like species |
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Shahid Ullah Khan, Adwait Bhingarde, Wiebren de Jong, Earl Goetheer, Ruud Kortlever. “Electrocarboxylation of 1,3-butadiene with CO₂ to 3-hexenedioic acid: Effect of operating parameters on product selectivity.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007901/v1
Values presented only in plots or images were not transcribed. The main paper refers to supporting information, but no separate supporting information file was available on the ChemRxiv article page
| ATR-FTIR | Strong carboxylate COO⁻ features were consistent with 3HDA/3PA formation; weaker carbonate-like signatures remained in the ≈900–950 cm⁻¹ region |
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| EDX | Al content: 0.6 wt % |
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