A series of new ternary complexes of 6 methyl 2 picolinic acid N oxide(HL) and 2,2′ bipyridine N,N′ dioxide(bipyO 2) with Ln 3+ (Ln=La, Sm, Eu, Gd, Tb, Dy, Yb) were synthesized and characterized. The composition of the ternary complexes is determined as {LnL 3·bipyO 2·H 2O} ( n-1 )H 2O ( n =2 5～3 0). They are nonelectrolytes in ethanol. It is found that fluorescence intensities of the ternary complexes, LnL 3·bipyO 2·H 2O, are weaker than those of binary complexes, LnL 3·H 2O. And it is also found that Tb 3+ luminescence at 489 3 nm in TbL 3·bipyO 2·H 2O is sensitized by bipyO 2, and it is stronger than that at 543 8 nm, Which differs from TbL 3·H 2O.
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