Two-electron mixed-valence compounds promote the rearrangement of the two-electron bond photochemically. Such complexes are especially effective at managing the activation of hydrohalic acids (HX). Closed HX-splitting cycles require proton reduction to H-2 and halide oxidation to X-2 to be both accomplished, the latter of which is thermodynamically and kinetically demanding. Phosphazane-bridged Rh-2 catalysts have been especially effective at activating FIX via photogenerated ligand-bridged intermediates; such intermediates are analogues of the classical ligand-bridged intermediates proposed in binuclear elimination reactions. Herein, a new family of phosphazane-bridged Rh-2 photocatalysts has been developed where the halide-bridged geometry is designed into the ground state. The targeted geometries were accessed by replacing previously used alkyl isocyanides with aryl isocyanide ligands, which provided access to families of Rh2L1 complexes. H-2 evolution with Rh-2 catalysts typically proceeds via two-electron photoreduction, protonation to afford Rh hydrides, and photochemical H-2 evolution. Herein, we have directly observed each of these steps in stoichiometric reactions. Reactivity differences between Rh-2 chloride and bromide complexes have been delineated. H-2 evolution from both HCl and HBr proceeds with a halide-bridged Rh-2 hydride photoresting state. The H-2-evolution efficiency of the new family of halide-bridged catalysts is compared to a related catalyst in which ligand-bridged geometries are not stabilized in the molecular ground state, and the new complexes are found to more efficiently facilitate H-2 evolution.