Crystal structures of [Li(7)(i-PrO)(3)(C(4)H(10)NO)(3)](2)O and [Na(i-PrOH)(2)(C(8)H(18)NO(2))](2)

The title compounds, hexa­kis­[μ(3)-2-(di­methyl­amino)­ethano­lato]hexa-μ(2)-iso­propano­lato-μ(4)-oxido-tetra­deca­lithium(I), [Li(7)(i-PrO)(3)(C(4)H(10)NO)(3)](2)O (1), and {3-[(2-meth­oxy­eth­yl)(meth­yl)amino]-1,1-dimethylpropano­lato}diiso­prop­an­o­lsodium(I), [Na(i-PrOH)(2)(C(8)H(18)NO(2))] (2), were crystallized in the presence of 2-propanol (i-PrOH, C(3)H(7)OH). The structure 1 has monoclinic symmetry (C2/c) and the asymmetric unit contains half of the compound. Title compound 2 has triclinic symmetry (P [Image: see text]) and the asymmetric unit is half of an inversion-symmetric aggregate. Both compounds consist of an alkali metal, an amino­alkoxide and a 2-propanol compound. Furthermore, the dimeric sodium aggregate 2 is build up by hydrogen bonding through the 2-propanol and the alkoxides. Compound 1 does not exhibit hydrogen bonding, due to the fact that the 2-propanol is deprotonated. In compound 1, benzene appeared as co-crystallate, but was suppressed by solvent masking because of strong disorder. The formula mass and density do not take account of the solvent.