Ligand values for

The oxidative addition reaction of I2 with (> -Cp )2Ln (Ln = Sm °" , Eu ° , Ybio.ii) j,ggj3 utilized as a thermodynamic anchor to determine absolute Ln-X bond disruption energies, D(Ln-X), in solution. Suitable thermodynamic cycles can be set up in which the ability to estimate an accurate value for >(Ln-I) is crucial to the accurate calculation of D(Ln-X) for various carbon- and silicon-donor ligands . Values for D(Ln-I) are obtained from reactions such as the one for Sm, where n (probably) equals 2 or 3 ° ... 

Values relative to the reaction + ligand, Values for Oh complexes NiLfH O). ... 

EDTA is one member of a class of aminocarboxylate ligands that form very stable 1 1 complexes with metal ions. The following table shows log Kf values for several ligands with Ca + and Mg +. Which ligand is the best choice for the direct titration of Ca + in the presence of Mg + ... 

The new macrocyclic hexaamine ligand X has the mixed protonation constants, log K of 10.10, 10.01, 8.96 and 8.02 at 25 °C and 1=0.2 M for the four most basic amines. The values for other weaker bases, including the six carboxylates, are all less than 5. From a comparison with logA values of the parent macrocycle [18]aneN6, it was deduced that the initial four protonations occur to the macrocyclic amine bases. Thus, the most abundant species of X at neutral pH is depicted as XI. 

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