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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: BrockaFloka on January 18, 2012, 10:43:33 PM

Title: square planar mechanism based on rates of various ligands
Post by: BrockaFloka on January 18, 2012, 10:43:33 PM

Here's the question:

This graph
(https://www.chemicalforums.com/proxy.php?request=http%3A%2F%2Fi41.tinypic.com%2F124d4cm.jpg&hash=899599a7009a4ce3a17dd9bc289acf07c4e6503e)


shows the observed first-order rate constants for the reaction of [PdBrL]+ with various Y- to give [PdYL]+ where L is Et2NCH2CH2NHCH2CH2NEt2. Propose a mechanism.


So far I am assuming that the mechanism is Dissociative because the rate has very little to do with the incoming ligands' concentration. But the exception to this is the S2O3 2- ion, and I cannot figure out why. I know the metal center is fairly sterically crowded, so could it be the size of this ion compared to the others?

Any insight would  be appreciated.

Title: Re: square planar mechanism based on rates of various ligands
Post by: BrockaFloka on January 19, 2012, 09:28:13 PM

is there possibly a nucleophilic difference between the ligands?