Abstract
The reaction of Cp/sub 2/U(NEt/sub 2/)/sub 2/ with carboxylic and thiocarboxylic acids produced complexes of the type Cp/sub 2/U(XYCR)/sub 2/ (X = Y = O, R = Me, Ph, t-Bu; X = O, Y = S, R = Me, Ph). Solubility properties of the acetate and benzoate derivatives indicate polymeric behavior, whereas molecular weight measurements show that the pivalate complex is dimeric and the thiobenzoate compound is monomeric. The infrared spectra of all the complexes indicate eta/sup 5/-cyclopentadienyl bonding and bidentate, chelating and/or bridging, carboxylate moieties. Assuming that the monomeric Cp/sub 2/U(OSCPh)/sub 2/ exhibits the expected pseudo-cis-octahedral geometry, it is shown that the variable-temperature /sup 1/H NMR spectra of the molecule is only compatible with a combination of metal-centered rearrangement and C-Ph bond rotation. The simple and temperature-invariant nature of the spectrum for Cp/sub 2/U(O/sub 2/CCMe/sub 3/)/sub 2/ implies a symmetrical dimeric structure, and a possibility for this is proposed.
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