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Polyaminopolycarboxylates are attractive ligands for binding cationic radionuclides for synthesis of radiopharmaceuticals with target delivery to tumor cells. Nowadays beta emitting Y−90 and Lu−177 are used as therapeutic agents, while Ac−225 and Bi−213 are considered as perspective for alpha therapy. In the present study new data on complexation of Y 3+ , Lu 3+ , Ac 3+  and Bi 3+  with 2,2’-(15-formyl-2,3,5,6,8,9,11,12-octahydrobenzo [b][ 1 , 4 , 10 , 7 , 13 ]trioxadiazacyclopentadecine-4,10- diyl)diacetic acid are presented. For ligand and complexes characterization potentiometric titration, solvent extraction, chromatography and solubility techniques were applied. The highest values of stability constants within the range of log  K  = 5.8 – 7.5 were found for Ac 3+  and REE. Fast complex formation is established which is beneficial for practical applications in radiopharmaceutical synthesis.

Complexation of Bi 3+ , Ac 3+ , Y 3+ , Lu 3+ , La 3+ and Eu 3+ with benzo-diaza-crown ether with carboxylic pendant arms