Solution and solid-state characterization of rare silyluranium(III) complexes.

A uranium(III) silylate complex [K(DME) 4 ][UI 2 {(Si(SiMe 3 ) 2 SiMe 2 ) 2 O}] (1) was stabilized by the addition of 18-crown-6, forming [K(18-crown-6)][UI 2 {(Si(SiMe 3 ) 2 SiMe 2 ) 2 O}] (1-crown). Crystallization under multiple conditions resulted in three distinct molecular structures. Compound 1-crown was further characterized in the solution state via 1 H, 13 C, and 29 Si NMR spectroscopy, and electronic absorption spectroscopy.