1,10-phenanthroline-2,9-dicarboxamides of various structure were synthesized and studied as ligands for separation and sensing of d-and f-metals. It was found that the extraction ability of dialkyl-diaryl-diamide to lanthanides decreases from La to Lu and extraction of Am is close to light lanthanides (La-Pr). Tetraalkyl-diamide are not selective to lanthanides, instead exhibiting moderate selectivity in Am/Ln separation. The diamide complexes with lanthanides and d-elements were synthesized and characterized by XRD analysis. All diamides have demonstrated good extraction ability to environmentally hazardous metals (cadmium, lead, copper). The synthesized compounds were also tested as ionophores in PVC-plasticized potentiometric sensor membranes. Such sensors displayed no perceptible response to lanthanides but exhibited high sensitivity towards copper, zinc, cadmium and lead. These compositions can be considered as promising cross-sensitive sensors for multisensor systems.

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Two complexes of uranyl nitrate with N,N,NЈ, and N,NЈ-diethyl-N,NЈ-diphenyl-2,6-pyridinedicarboxamide (EtPhDPA) were synthesized and studied. The complex of tetraalkyl-2,6-pyridinedicarboxamide with metal nitrate was synthesized for the first time. XRD analysis revealed * Prof. Dr. M. Alyapyshev E-Mail: mikkaly@gmail.com [a] ITMO University 49, Kronverksky pr.

Solvent extraction of microamounts of Eu 3+ and Am 3+ from water into nitrobenzene by means of a mixture of hydrogen dicarbollylcobaltate (H + B -) and N,N,N',N'-tetrabutyl-1,10-phenanthroline-2,9-dicarboxamide (L) N,N,N',N'-tetrabutyl-1,10-phenanthroline-2,9-dicarboxamide) are extracted into the nitrobenzene phase. Extraction and stability constants of the cationic complex species in nitrobenzene saturated with water were determined and discussed. From the experimental results it is evident that this effective N,N,N',N'-tetrabutyl-1,10-phenanthroline-2,9-dicarboxamide receptor for the Eu 3+ and Am 3+ cations could be considered as a potential extraction agent for nuclear waste treatment.

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