from VWR; phosphorous acid (99%) and hexylamine (98%) from Fluka Chemical
Co.; 2-ethylhexylamine (98%), La(NO3)3·6H2O, and propylamine hydrochloride from Sigma-Aldrich; ethylamine
hydrochloride (98%), butylamine (99%), and Y(NO3)3·6H2O (99.8%) from Merck; and Lu(NO3)3·H2O from abcr and amylamine (98%) from TCI
chemicals. All of the chemicals were reagent grade and used without
further purification. NMR measurements and titrations were performed
on a Bruker Avance III 300 MHz-spectrometer, and NMR data was processed
with Bruker TopSpin 4.0.8. IR spectra were measured by Bruker Alpha
FT-IR. Elemental analyses were done by an Elementar Vario EL III-analysator.
Lanthanoid concentrations were determined by a Perkin Elmer Optima
8300 DV ICP-OES- spectrometer.