All reagents were of analytical grade and were used without any further purification. The following agents were bought from Sigma Aldrich (St. Louis, MO, USA) unless otherwise specified: resorcinol (m-C6H4(OH)2, 99%), formaldehyde solution (37 wt% in H2O, stabilized with methanol, Chem-Lab, West-Vlaanderen, Belgium), bismuth (III) nitrate pentahydrate [Bi(NO3)3·5H2O, 98%, Alfa Aesar (Haverhill, MA, USA)], acetic acid (CH3COOH, 99.7%), anhydrous iron (II) acetate (Fe(OOCCH3)2, minimum Fe content 29.5%), acetic acid (CH3COOH, 99%), ammonium hydroxide water solution (NH3aq., 10 wt%), and glycerol formal (47–67% 5-hydroxy-1,3-dioxane, 33–53% 4-hydroxymethyl-1,3-dioxolane). Bidistilled water was used for solution preparation.
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