Abstract: Five multidentate ligands: N,N′-di(1,10-phenanthroline-2-methylene)-1,2-ethylenediamine(L1),1,7-di(1,10-phenanthroline-2-methylene)-n-1,4,7-triazaheptane(L2), 1,10-di(1,10-phenanthroline-2-methylene)-n-1,4,7, 10-tetraazadecane(L3), 1,13-di(1,10-phenanthroline-2-methylene)-n-1,4,7,10,13-pentaazatridecane(L4), N,N′-di(1,10-phenanthroline-2-methylene)-1,3-diaminopropane(L5) were synthesized and characterized. The stability of the complexes of the five ligands with transition metal ions Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ) and Zn(Ⅱ) was studied by the potentiometric technique in water and I=0.1 mol·dm-3 KNO3 at 25.0 ± 0.1 ℃, respectively. The difference among the five series of complexes is tentatively explained. |