Heat of formation of bis(η-cyclopentadienyl)dimethyltungsten and bis(η-cyclopentadienyl)dimethylmolybdenum

Abstract

Bond-enthalpy contribution values D(Mo–Me)= 149·5 kJ mol^–1 and D(W–Me)= 197·8 kJ mol^–1 have been derived from the standard enthalpies of formation ΔH°_f[Mo(η-C₅H₅)₂Me₂, c]=(283·8 ± 3·8) kJ mol^–1 and ΔH°_f[W(η-C₅H₅)₂Me₂, c]=(295·6 ± 3·5) kJ mol^–1 obtained from measurements of the reaction enthalpies of Mo(η-C₅H₅)₂Me₂(c) and W(η-C₅H₅)₂Me₂(c) in an aqueous solution of hydrochloric acid.