Аннотация:New powerful complexing group of phosphororganic tripodandes (POTP) synthesized by an economic approach were studied as chemical sensors for different ionoselective electrodes. The substitutive central group of POTP influenced the characteristic rows of potentiometric selectivity coefficient. The central-phosphoric tripodandes were highly selective to Ca(2+) and Pb(2+), while the central-amine tripodandes were selective to Cd(2+), Pb(2+) and Cs(+). The selectivity of the central-amine tripodandes strongly depended on the substituting of N-adjusted methylene group for ethylene-glycol group. For membranes sensorized with the central-phosphorous podandes, the enlargement of the by-side chain for one methylene group maid no practical influence