Abstract
Two new mixed ligand ruthenium(I) complexes of the composition [Ru2(O2CR)2(CO)5] (where R = (2,4-CF3)2C6H3 (1) and (3,5-CF3)2C6H3 (2)) have been prepared by melt reactions, and both have been fully characterized. Crystals of 1 and 2 have been obtained by gas phase sublimation of crude products at 124 and 150°C, respectively. The X-ray diffraction studies have revealed a tetranuclear ‘dimer of dimers’ core structure in both cases. In 1 two diruthenium(I) units cis-bridged by two carboxylates each are coordinated through the Ru···FO axial interactions at 2.301(2) A. In contrast, complex 2 shows the direct Ru···FRu bonding of two diruthenium units at 2.9065(9) A. The Ru–Ru distances within the dinuclear units are 2.6654(7) and 2.6859(8) A in 1 and 2, respectively.
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