Pyrazine-bridged trimeric and tetrameric oligomers of triruthenium clusters, [{Ry(3)O(CH3CO2)(6)(CO)(py)}-(mu-pz)-{Ru3O-(CH3CO2)(6)(CO)}-(mu-pz) {Ru3O(CH3CO2)(6)(py)(2))}](+) (1) and [{Ru3O(CH3CO2)(6)(CO)(py)}-(mu-pz) -{Ru3O(CH3CO2)(6)(CO)}-(mu-pz)-{Ru3O(CH3CO2)(6)(py)}-(mu-pz) -{Ru3O(CH3CO2)(6)(dmap)2}](2+) (2), were prepared (pz = pyrazine, py = pyridine, dmap = 4-dimethylaminopyridine). Trimer 1 and tetramer 2 show closely spaced 11 step-12 electron and 14 step-15 electron reversible redox waves, respectively, in their cyclic voltammograms in CH3CN. These compounds were designed specifically to incorporate the above-mentioned electrochemical behavior, using the unique redox properties characteristic of triruthenium clusters: (i) each Ru-3 cluster unit generally exhibits four reversible single electron waves from Ru-3 (IV,111,111) to Ru-3 (11,11,11) state; (ii) the redox potentials of the cluster units strongly depend on the basicity of the ancillary ligand; (iii) redox potentials of the Ru-3 cluster units vary by 300-500 mV depending on the presence or the absence of a carbonyl ligand on the cluster unit; (iv) in the negative potential region, electronic interaction through the bridging pyrazine between adjacent Ru-3 units containing a carbonyl ligand makes the difference in redox potential of each unit larger. 1 and 2 were synthesized by linking Ru-3 cluster units with the desired ancillary ligand set in the appropriate order.