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The complexation oflanthanide(Ⅲ) cations with 1,2-propanediaminetetraacetate (1,2-PDTA)in aqueous solution has been investigated by ~(23)Na,~(35)Cl,~2H and ~(17)O NMR shift measurements.It hasbeen shown that the contact shifts are dominant for ~(17)O,~(35)Cl and ~2H (only for the heavier lanthanideseries) and the pseudocontact shifts are dominant for ~(23)Na.It is suggested that the 1,2-PDTA ligandis bound pentadentately via the two nitrogens and the three carboxylates for the lighter lanthanidecomplexes,hexdentately via the two nitrogens and the four carboxylates for the heavier ones.Thenumbers of the water coordinated were determined.The small amount of chloride anion in innercoordination sphere was observed.
The complexation oflanthanide (Ⅲ) cations with 1,2-propanediaminetetraacetate (1,2-PDTA) in aqueous solution has been investigated by Na, ~ (35) Cl, ~ 2H and ~ (17) .It hasbeen shown that the contact shifts are dominant for ~ (17) O, ~ (35) Cl and ~ 2H (only for the heavier lanthanideseries) and the pseudocontact shifts are dominant for ~ (23) Na.It is suggested that the 1,2-PDTA ligandis bound pentadentately via the two nitrogens and the three carboxylates for the lighter lanthanide complexes, hexdentately via the two nitrogens and the four carboxylates for the heavier ones. Members of the water coordinated were determined. The small amount of chloride anion in innercoordination sphere was observed.