A dinuclear Ru complex, [{Ru(tPY)Cl}(2)(mu-L)](PF6)(2) (1), was synthesized by the reaction of the flexible bridging ligand L (= N,N'-bis(5-bipyridylhexyl)-cis-1,4-cyclohexanediamine) with [Ru(tpy)Cl-3]. The complex contained two [Ru(tpy)(bpy)Cl](+) moieties linked by L, and the reaction of 1 with AgNO3 allowed for isolation of the ligand-exchanged product [{Ru(tpy)-(Solv.)}(2)(mu-L)](PF6)(4) (2). The behavior of 2 as a CO2 reduction electrocatalyst was investigated in acetonitrile. Under N-2, two reduction peaks appeared at E-p,E-c = 1.08 (tpy/tpy(.-)) and -1.40V (bpy/bpy(.-)) vs. NHE. In a saturated CO2 solution, a further reduction peak, at E-p,E-c = 1.60 V, showed significant current enhancement consistent with electrocatalytic CO2 reduction. The primary product of the CO2 reduction was CO, and the turnover frequency was calculated to be ca. 1.4 s(-1).