G. Mechanisms that Racemize the &Lambda and &Delta Forms of Metal Tris Chelates
1. Non-dissociative Mechanisms: c. Contrasting the Bailar Twist and Ray-Dutt Mechanisms for GaL3


Calculated Transition State for the Bailar Twist
Viewing Tools:

Viewing Calculated Motions


Calculated Transition State for the Ray Dutt
Viewing Tools:

Viewing Calculated Motions

Notice that both of these mechansims constitute a twisting motion when viewed with the oxygen atoms in an eclipsed orientation.
For the Bailar twist, three oxygen atoms all on different ligands (in a facial orientation) twist in the same direction while the oxygen atoms on the opposite face twist in the opposite direction.
In contrast, in the Ray-Dutt Mechanism, two oxyen atoms on one ligand and one oxygen atom on a second ligand twist in one direction, while the two oxygen atoms on the third ligand and the remaining oxygen atom on the second ligand twist in the oppositve direction.

Return to Index