A Theoretical and Experimental Investigation of the Reduction of Dinuclear Persulfide-Bridged Ruthenium Complexes

Дата публикации: 10-09-2026 00:00:00

Abstract:
Previously, the dinuclear persulfide-bridged ruthenium complex [(H2O)(NH3)4Ru(μ-S2)Ru(NH3)4(OH2)]4+ was demonstrated to be a reduction-activated H2S donor, acting as a promising complex for the biological delivery of this gasotransmitter. Building on previous studies, other complexes bearing the [RuSSRu] motif were investigated for H2S release. In this study, a previously reported persulfide-bridged complex [(acac)(Me3TACN)Ru(μ-S2)Ru(Me3TACN)(acac)]2+ was evaluated. The crystal structure of a new crystal form of this complex was determined revealing a new orientation of supporting ligands about the trans-[RuSSRu] motif. Furthermore, resonance Raman spectroscopy revealed symmetric Ru–S and S–S stretching frequencies of 418 and 528 cm–1, respectively. Lastly, the electrochemistry of this complex was probed in aqueous buffer revealing an irreversible reduction at −758 mV vs SCE. The reactivity of [(acac)(Me3TACN)Ru(μ-S2)Ru(Me3TACN)(acac)]2+ was studied...

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