Question

Rationlize the rate constant trends for the following electron transfer complexes (i.e. why is there such...

Rationlize the rate constant trends for the following electron transfer complexes (i.e. why is there such a big difference between 1 and 2 and a big difference between 2 and 3 ?

# Reaction pair Rate Constant
1 [Ru(bpy)3]3+/2+ 4 x 108
2 [Ru(NH3)6]3+/2+ 6.6 x 103
3 [Co(NH3)6]3+/2+ 6 x 10-6
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Answer #1

[Ru(bpy)3]3+/2+ has a rate constant = 4 x 10^8 beacuse of the charge transfer takes place via inner sphere mechanism due to presence of bpy (bipyradine) group which provide a ease medium through the resonance travellingof the charge.

[Ru(NH3)6]3+/2+ takes place through the outer sphere transfer mechanism and therefore have a low rate constant then the upper one.

[Co(NH3)6]3+/2+ have very low rate constant because there is no inner or outer sphere mechanism and also there is a spin change from the low field to high field complex which makes the electron transfer very hard.

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