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The carbonyl donor of an alkyne capping ligand stabilizes a reactive tetraruthenium framework,which sheds light on the fragmentation and formation of low-valence ruthenium clusters.The thermolysis reaction of the triruthenium cluster,Ru3(CO)12(1)with 1,3-ynone,1-(4-methoxyphenyl)-3-phenylprop-2-yn-1-one(2)were systematically investigated.