Abstract
The ligand bis-1-(1′-diphenylphosphinoferrocenyl)phenylphosphine, triphosfer, reacts with dichlorotris-triphenylphosphineruthenium(II) to give the complex [(triphosfer)RuCl 2], ( 17), in almost quantitative yield. This complex reacts with CO at ambient temperature to afford [(triphosfer)Ru(CO)Cl 2]. Three related complexes, [{(η-R 2PC 5H 4)Fe–μ 2-(η-C 5H 4P(R′)η-C 5H 4)Fe(η-C 5H 4R 2)}RuCl 2], R,R′=Ph, iPr ( 18–20), exhibit identical chemical properties. Reaction of complexes 17–20 with excess PMe 2Ph results in the deligation of the ferrocene ligand. The electrochemistry shows that while the diferrocenyltriphosphine ligands undergo a single two-electron oxidation, irreversible in character, complexes ( 17–19) exhibit two separated one-electron oxidations having features of chemical reversibility. This data suggests that while within the ligands no electronic communication exists between the two ferrocene subunits, complexation with RuCl 2 allows communication between the two ferrocenes. The single crystal X-ray structure of [(triphosfer)RuCl 2] has been determined.
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