Mass Spectrometric Studies of the Ionization and Thermal Decomposition of Tungsten π-Cyclopentadienyl Tricarbonyl Dimer

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Abstract

The ionization and thermal decomposition of tungsten π-cyclopentadienyl tricarbonyl dimer [WC 5 H 5 (CO) 3 ] 2 was investigated using a mass spectrometer fitted with single and double cell molecular flow inlet systems.The electron impact mass spectrum and appearance potentials for the principle ions in the spectrum have been measured and recorded.The enthalpy change for the dissociation[Formula: see text]obtained from van't Hoff plots of the temperature dependence of the equilibrium constant was found to be 234.4 ± 3.8 kJ/mol. This result was substantiated by an electron impact value of 221.0 ± 20.1 kJ/mol based on an ionization potential for ·WC 5 H 5 (CO) 3 of 7.66 ± 0.05 eV measured in the high temperature studies.

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