Chalcogenide-capped triruthenium clusters: X-ray structures of [Ru3(CO)6(μ3-CO){P(C4H3S)3}(μ-dppm)(μ3-O)] and [(μ-H)2Ru3(CO)6{P(C4H3S)3}(μ-dppm)(μ3-S)]

► Reactions of [Ru3(CO)9{P(C4H3S)3}(μ-dppm)] with molecular O2, elemental S and Se. ► Formation of chalcogenide-capped triruthenium clusters. ► Oxidative-addition of H2S into [Ru3(CO)9{P(C4H3S)3}(μ-dppm)]. ► Formation of sulfido-capped dihydride [(μ-H)2Ru3(CO)6{P(C4H3S)3}(μ-dppm)(μ3-S)].