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Synthesis and Characterization of Triruthenium Complexes Containing a Perpendicularly Coordinated Alkyne Ligand

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journal contribution
posted on 20.12.2004, 00:00 by Toshiro Takao, Yoshiaki Takaya, Eisuke Murotani, Ryu-ichi Tenjimbayashi, Hiroharu Suzuki
Treatment of the triruthenium pentahydrido complex {Cp*Ru(μ-H)}33-H)2 (1; Cp* = η5-C5Me5) with substituted alkynes results in the exclusive formation of the μ3-alkyne complex {Cp*Ru(μ-H)}3322(⊥)-RCCR‘) (2a, R = Ph, R‘ = H; 2b, R = C(CH3)3, R‘ = H; 2c, R = Ph, R‘ = CH3), in which the alkyne adopts a perpendicular coordination mode relative to one of the Ru−Ru edges, as revealed by an X-ray structure determination. The acetylenic carbon located inside the trinuclear core is shown to appear at particularly high magnetic field in the 13C NMR spectra.