Abstract
The photolysis of 4,4'-disubstituted, 2,2'-bipyridine fac-Re(bpy)(CO)3H derivatives produces stoichiometric H2 gas. The rate of production varies greatly depending on the electronic nature of the disubstituted bipyridine (bpy) with halogenated substituents increasing the rate. Isotope labeling studies along with B3LYP geometry optimization DFT modeling studies indicate a mechanism involving a Re-H-Re bridging complex that leads to a dimeric Re-Re(η2-H2) state prior to dissociating H2 gas.
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