2.1. Materials

Urea (CH₄N₂O, Proquimsa, Coahuila, Mexico), phosphorus pentoxide (P₂O₅, Sigma-Aldrich, St. Louis, MO, USA), zinc powder (Chemical Dynamics, Florida, USA), ethanol (C₂H₆O, Sigma-Aldrich, St. Louis, MO, USA), methanol (CH₄O, Sigma-Aldrich, St. Louis, MO, USA), acetone (C₃H₆O, Sigma-Aldrich, St. Louis, MO, USA), Toluene (C₇H₈, Sigma-Aldrich, St. Louis, MO, USA), Hexane (Sigma-Aldrich, St. Louis, MO, USA), Phosphoric Acid (H₃PO₄, Fermont, Nuevo León, Mexico), Ammonium Hydroxide 30% (NH₄OH, Fermont, Nuevo León, Mexico), Hydrochloric Acid 30% (HCl, Fermont, Nuevo León, Mexico), porcine hematin (Sigma-Aldrich, St. Louis, MO, USA), aniline (Sigma-Aldrich, St. Louis, MO, USA), sodium carbonate (Na₂CO₃, Sigma-Aldrich, St. Louis, MO, USA), sodium bicarbonate (NaHCO₃, Sigma-Aldrich St. Louis, MO, USA), p-toluene sulfonic acid (TSA, Sigma-Aldrich, St. Louis, MO, USA), hydrogen peroxide (H₂O₂, Sigma-Aldrich, St. Louis, MO, USA), Dimethyl sulfoxide (DMSO, Sigma-Aldrich, St. Louis, MO, USA), N-Methyl-2-pyrrolidone (NMP, Sigma-Aldrich, St. Louis, MO, USA), deuterated sulfuric acid (D₂SO₄, Sigma-Aldrich, St. Louis, MO, USA), deuterated DMSO (Sigma-Aldrich, St. Louis, MO, USA), deuterated acetone (Sigma-Aldrich, St. Louis, MO, USA) and deuterated water (D₂O, Sigma-Aldrich, St. Louis, MO, USA).