These carbon monoxide stretching frequencies display an expected trend that inversely correlates to the σ-donating abilities of the terminal phosphine ligands, L .
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Synthesis, characterization, DFT calculations, and crystal structure of [Ru<sub>2</sub>(O<sub>2</sub>CCF<sub>3</sub>)<sub>2</sub>(CO)<sub>4</sub> <i>L</i> <sub>2</sub>]: tri-fluoro-acetate-bridged dimeric ruthenium(I) sawhorse complexes bearing phosphine ligands.
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