trifluoroacetate 99%, yttrium(III) nitrate hexahydrate 99.8%, yttrium(III)
chloride hexahydrate 99.99%, samarium(III) acetate hydrate 99.9%,
europium(III) acetate hydrate 99.9%, lutetium(III) acetate hydrate
99.9%, citric acid 99%, maleic acid ≥99%, citraconic acid 98%,
tetramethylammonium hydroxide 25% v/v in water, tetrabutylammonium
fluoride hydrate 98%, and ammonium fluoride >99.99% were purchased
from Sigma-Aldrich. Ethanol 96% from Panreac, acetone 99.5% from Scharlau,
and deuterium oxide 99.90% D were purchased from euriso-top. All reagents
were used as received without further purification.