B. Vaartstra, J. Huffman, W. E. Streib
1991
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96
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Inorganic Chemistry
Abstract
Barium hexamethyldisilazide tetrahydrofuranate, Ba(N(SiMe{sub 3}){sub 2}){sub 2}(THF){sub 2} (1), is synthesized from barium granules and 1,1,1,3,3,3-hexamethyldisiliazane at 25{degree}C in THF. Gaseous ammonia is a necessary catalyst. In the solid state, the compound is a monomer containing a tetrahedral four-coordinate barium center. One of the coordinated THF molecules is removed from 1 by stripping a toluene solution of 1 to dryness in vacuo, yielding (Ba(N(SiMe{sub 3}){sub 2}){sub 2}(THF)){sub 2} (2). In the solid state, 2 is a dimer containing two bridging and two terminal hexamethyldisilamido groups. The four-coordinate, tetrahedral geometry at each barium is completed by terminal THF molecules. The solvent-free compound (Ba(N(SiMe{sub 3}){sub 2}){sub 2}){sub 2} (3) is obtained by sublimation of 1. This compound is a dimer in the solid state, with three-coordinate barium centers. Crystal data are reported for all these compounds 14 refs., 3 figs., 9 tabs.