5">Extraction of Am3 +, La3 +, Eu3 + and Lu3 + was studies with HPMBP in RTIL.
10">Species with RTIL were different than that obtained with molecular solvents.
15">Cationic species like M(HL)L2+ were extracted.
Luminescence spectroscopy suggested presence of inner-sphere water.
5">Stability constants of Nd3 + - HPMBP were determined for the first time.