Handout8-CHELATES&MACROCYCLIC EFFECT

Handout8-CHELATES&MACROCYCLIC EFFECT - CEM 834...

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CEM 834 CHELATE AND MACROCYCLIC EFFECT FALL 2005 TABLE I: Illustration of the chelate effect for complexes of Cd 2+ with amine ligands in water at 25 ºC. Complex log f cn β ∆Gº kcal mol –1 ∆Hº kcal mol –1 ∆Sº cal mol –1 K –1 + 2 4 3 ) NH ( Cd 7.44 –10.15 –12.70 – 8.52 + 2 4 3 2 ) CH NH ( Cd 6.55 – 8.94 –13.70 –16.00 + 2 2 2 2 2 2 ) NH CH CH NH ( Cd 10.62 –14.50 –13.50 + 3.29 TABLE II: Illustration of the chelate effect for complexes of various divalent metals with pyridine and 2,2'-bipyridine ligands in water at 25 ºC. Cation Pyridine Complex 2,2'-Bipyridine Complex Difference Cd 2+ log f 4 c β = 2.5 log f 2 c β = 7.3 4.8 Cu 2+ log f 4 c β = 6.4 log f 2 c β = 16.3 9.9 Ni 2+ log f 4 c β = 5.6 log f 2 c β = 13.6 8.0 Ni 2+ log f 6 c β = 9.8 log f 3 c β = 19.3 9.5
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FIGURE 1: Linear and macrocyclic amine ligands. TABLE III: Illustration of the macrocyclic effect for complexes of Cu 2+ with the amine ligands shown in Figure 1 in water at 25 ºC. From A. Anichini, L. Fabbrizi, P.
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Handout8-CHELATES&MACROCYCLIC EFFECT - CEM 834...

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