Organo-f-element thermochemistry. Thorium vs. uranium and ancillary ligand effects on metal-ligand bond disruption enthalpies in bis(pentamethylcyclopentadienyl)actinide bis(hydrocarbyls) and bis(pentamethylcyclopentadienyl) alkoxy actinide hydrides and hydrocarbyls

Thorium and uranium-ligand bond disruption enthalpies (D(M-R)) have been determined for a series of complexes of the type Cp'/sub 2/M(R)X, where M = Th, or U, Cp' = eta/sup 5/-(CH/sub 3/)/sub 5/C/sub 5/, R = alkyl, aryl, or hydride, and X = alkyl, chloride, or alkoxide. The thermodynamic data were obtained by anaerobic, batch-titration, solution calorimetry from the enthalpies of solution of the organic-f-element complexes in toluene and from the subsequent enthalpies of alcoholysis with tert-butyl alcohol or methanol.