Metal hydroborates and hydroborato metalates .21. Solvates of lithium (dimethylamino)trihydroborate

Li(Me(2)NBH(3)) (1) was prepared by deprotonation of Me(2)NH . BH3 with LiBu and its solubility determined in various solvents. Compound 1 is unstable in most ethereal solvents and decomposes in a reversible reaction into LiH and Li(Me(2)N-BH2-NMe(2)-BH3) (2). Five solvates of 1 were characterised by X-ray structure analysis. Li(Me(2)NH(3)). TMEDA is a dimer in the solid state, and two units are connected to one another by B-H ... Li bonds. The crystal structure of Li(Me(2)NBH(3)). 0.5 dioxane is represented by layers consisting of tetrameric Li(Me(2)NBH(3)) units connected via dioxane molecules. Each Li atom is coordinated to one oxygen atom, one nitrogen atom, and two hydrogen atoms. Also Li(Me(2)NBH(3)). 0.5 O2C3H6 forms an extended layer, however with pentacoordinated Li atoms which bear one oxygen, one nitrogen, and three hydrogen atoms. A similar layer structure was also found for Li(Me(2)NBH(3)). O3C3H6 where each Li atom is bound to two oxygen atoms of different trioxane molecules, one nitrogen atom, and two hydrogen atoms. Finally, Li(Me(2)NBH(3)). 12-crown-4 retains its molecular integrity in the solid state. Its Li atom is pentacoordinated by four oxygen atoms and one nitrogen atom.