SYNTHESIS AND COMPLEXING PROPERTIES OF -TRI-[2-(DIPHENYLPHOSPHINYL)ETHYLAMINO]CYCLOHEXANE

A novel polydentate phosphorus-containing complexing agent, -tri[2-(di phenylphosphinyl)ethylamino]cyclohexane, has been prepared on the basi s of cis,cis-1,3,5-triamino-cyclohexane. The method of potentiometric titration in an aqueous-organic medium (70 % ethanol, ionic strength 0 .01 M LiNO3, 298 K) has been used to study the acid-base and complexin g properties of the title compound. The ligand thus prepared forms 1 : 1 complexes with Cu2+, Co2+, Zn2+, and Ni2+ cations; formation of hyd roxocomplexes MOHL+ has been observed in the case of Zn2+ and Cd2+.