Diruthenium compounds of heterocycle-containing acetylides

Novel diruthenium compounds containing heterocycle-acetylide are reported here. Ru2(Y-DMBA)4(Ctriple bond; length of mdashC-2-pyrimidine)2 were prepared from the reaction between Ru2(Y-DMBA)4(NO3)2 and HCtriple bond; length of mdashC-2-pyrimidine in the presence of Et2NH, where Y-DMBA is either N,N′-dimethylbenzamidinate (DMBA, Y = H) or N,N′-dimethyl-(3-methoxy)benzamidinate (Y = 3-CH3O). Ru2(Y-DMBA)4(Ctriple bond; length of mdashC-4-N-methylpyridinium)2 were obtained through the methylation of known compounds Ru2(Y-DMBA)4(Ctriple bond; length of mdashC-4-pyridine)2. Both the structural and voltammetric data are consistent with the heterocycles being moderate electron acceptors.