Ammonium acetate ch3co2 nh4

Cyclam (1,4,8,11-tetraazacyclotetradecane) from CheMatech (Dijon, France) was stored in vacuum desiccators. The 2-(chloromethyl) pyridine hydrochloride (picolyl chloride chlorohydrate) was purchased from Sigma-Aldrich. Formaldehyde from Sigma-Aldrich (37% in water, density 1.08) contained 10–15% of methanol as stabilizer to prevent polymerization. The solvents such as diethyl ether (C₂H₅)₂O, dichloromethane (CH₂Cl₂), acetonitrile (CH₃CN) and chloroform (CHCl₃) from Sigma-Aldrich were anhydrous with a purity higher than 99.5%. Sodium iodide (NaI), magnesium sulphate (MgSO₄) and ammonium acetate (CH₃CO₂⁻NH₄⁺) were also purchased from Sigma-Aldrich. Four lanthanides were purchased from Sigma-Aldrich: gadolinium(III) nitrate hexahydrate (Gd(NO₃)₃·6H₂O), europium(III) nitrate pentahydrate (Eu(NO₃)₃·5H₂O), terbium(III) nitrate pentahydrate (Tb(NO₃)₃·5H₂O) and dysprosium(III) nitrate hydrate (Dy(NO₃)₃·xH₂O). Negative urine control was provided by Sigma-Aldrich.

Zinc acetate dihydrate (Zn(CH₃COO)₂ ·2H₂O) and ammonium acetate (CH₃CO₂NH₄) precursors from Sigma Aldrich, (99.999%) were dissolved into the solvent of 2-methoxyethanol (CH₃OCH₂CH₂OH) to synthesize 0.1 M zinc oxide (ZnO) solution. 0.2 M aluminum oxide (AlO_x) precursor solution was made by dissolving aluminum chloride (AlCl₃) (Sigma Aldrich, 99.999%) into a mixed solvent of acetonitrile and ethylene glycol. All the precursor solutions were prepared under an N₂ environment and stirred at least 2 h to get a transparent solution. A 0.45 μm PTFE filter was used to get the desired precursor solutions.