A new Ru(II)Rh(III) structural motif [(bpy)2Ru(dpp)RhCl(tpy)](4+) with one halide on the Rh(III) center demonstrates light-driven proton reduction ability, establishing that two halide ligands are not mandatory despite all prior systems containing a cis-RhCl2 catalytic site. This new design provides a novel approach to modulate Rh(III) redox behavior and catalytic activity with insight into catalytic intermediates.
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