The syntheses and crystal structure determinations of a pair of 'sawhorse' dimers are reported, viz. [Ru(2)(C(6)H(5)CO(2))(2)(C(5)H(5)N)(2)(CO)(4)] [a new polymorph, cf. Kepert, Deacon, Spiccia, Fallon, Skelton & White (2000). J. Chem. Soc. Dalton Trans. pp. 2867-2874] and [Ru(2)(CF(3)CO(2))(2)(C(5)H(5)N)(2)(CO)(4)]. The Ru.Ru distances are 2.6724 (2) and 2.7122 (5) A, respectively.