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New Acidic Complexons with Bipyridine Anchor Groups and their Cation Selectivity
Ohm, Christian,Voegtle, Fritz
, p. 22 - 27 (2007/10/02)
The new acidic complexons 2a and 3a bearing a bipyridine anchor group have been synthesized.Selectivity and stability of the complexons with several metal ions were determined by potentiometric titration and compared to those of EDTA and other complexons: Ligand 2a in particular forms remarkable stable complexes with Zn2+, Cd2+, and Mn2+, while the stability constants of the Ca2+- and Mg2+ complexes are of usual magnitude.On the other hand, the alkaline earth metal complexes of 3a are more stable and comparable to those of EDTA with a pronounced peak selectivity towards Ca2+.
