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The importance of discovering the true catalytically active species involved in photocatalytic systems allows for a better and more general understanding of photocatalytic processes, which eventually may help to improve their efficiency. Bi 2 O 3  has been used as a heterogeneous photocatalyst and is able to catalyze several synthetically important visible-light-driven organic transformations. However, insight into the operative catalyst involved in the photocatalytic process is hitherto missing. Herein, we show through a combination of theoretical and experimental studies that the perceived heterogeneous photocatalysis with Bi 2 O 3  in the presence of alkyl bromides involves a homogeneous Bi  n  Br  m   species, which is the true photocatalyst operative in the reaction. Hence, Bi 2 O 3  can be regarded as a precatalyst which is slowly converted in an active homogeneous photocatalyst. This work can also be of importance to mechanistic studies involving other semiconductor-based photocatalytic processes.

Shedding light on the nature of the catalytically active species in photocatalytic reactions using Bi2O3 semiconductor