in ethanol; water ppt. filtered off; washed (water, ethanol, acetone), crystd. twice (toluene/methanol 1:1), filtered, dried in vac. at 40°C for 24 h; elem. anal.;

in not given slight excess of lanthanide salt, vigorous stirring (50 - 60°C, pptn.); digestion, filtration, washing (H2O, ether), drying, recrystn. (benzene/MeOH);