Abstract
The Ru 3(CO) 12/Ru(CO) 5-equilibrium was investigated. It was observed, that the rate of equilibration is slow even at higher temperatures (e.g. ca. 550 h at 100°C, 2.50 bar CO in isooctane and ca. 10 h at 150°C, 5.4 bar CO in n-hexane). It is about doubled if the carbon monoxide contains 2% H 2. The ruthenium concentrations were measured by IR spectroscopy using a high pressure infrared cell. Thorough solubility and density measurements were performed for carbon monoxide in n-hexane. The temperature dependence of the equilibrium constant, extrapolated to 1 bar, is given by the equation ln K° a = K° x = −7.32+1560/ T. For the temperature range 100°−175°C, the enthalpy of reaction, Δ H° R, calculated therefrom is −13.0±1.1 kJ/mol and the entropy of reaction Δ S° R. is −60.8±2.6 J/mol K. From the former, an enthalpy of formation, Δ H° f{Ru(CO) 5} of −714±10kJ/mol and an enthalpy of disruption, Δ H° disr{Ru(CO) 5}, of 819±11kJ/mol can be calculated. The mean RuRu bond dissotation enthalpy, R(RuRu), is 159±3kJ/mol, the one for the RuCO bond, D(RuCO), is 164±2 kJ/mol.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
