Reduction of [U(NN'(3))I] [NN'(3) = N(CH2CH2NSiMe2But)(3)] with potassium in pentane gives the purple trivalent monomer [U(NN'(3))] in good yield, this compound having previously been synthesised via fractional vacuum sublimation of mixed-valent [{U(NN'(3))}(2)(mu-Cl)]. The magnetic susceptibility of this compound is consistent with the presence of U(III) centres, and this is confirmed by a characteristic near IR spectrum. Its reactions with Lewis bases to give e.g. [U(NN'(3))(Py)] and [U(NN'(3))(HMPA)] are reported, along with the molecular structure of the latter. The complex [U(NN'3)] is readily oxidised, imido and hydrazido complexes being formed readily by reaction with trimethylsilyl-azide and -diazomethane, respectively. The reaction with methylene trimethylphosproane however led to the formation of an addition compound [U(NN'(3))(CH2PMe3)]. Reaction of this latter complex with air gave a few crystals of the unusual hydroxo complex [U(NN'(3))(OH)(CH2PMe3)] which was structurally characterised. Reaction of [U(NN'(3))(CH2PMe3)] with trimethylamine N-oxide gave pentavalent [U(NN'(3))(O)], or perhaps a dimer thereof. The latter complex reacted with [U(NN'(3))] to give the bridging oxo complex [{U(NN'(3))}(2)(mu-O)] which could also be prepared directly by reaction of trimethylamine N-oxide with [U(NN'(3))]

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An easily synthesised Sn(II) bis(ureide) derivative is shown to be a single-source precursor for the aerosol-assisted CVD of SnO, providing unprecedented levels of oxidation state control at temperatures as low as 250 °C.