“…In mononuclear or dinuclear transition-metal complexes, thiosemicarbazone ligands are known to bind to metal ions as neutral, deprotonated N,S bidentate, [1] or N,S,X (X = N, O, C)-tridentate [2] donors to form five-or four-membered chelate rings. Although a number of studies of the coordination behavior of thiosemicarbazone derivatives have concerned high-oxidation-state transition-metal cations, there is little structural information on low-oxidation-state trinuclear complexes [3] with thiosemicarbazones. Here we report the investigation of the reaction of (carbonyl)triruthenium with acetylferrocene thiosemicarbazone (η 5 -C 5 H 5 )Fe(η 5 -C 5 H 4 )C(Me)=NN(H)C(S)NH(Me) [L] [4] in thf.…”