K2Li(NH2)3 and K2Na(NH2)3-synthesis and crystal structure of two crystal-chemically isotypic mixed-cationic amides

The figure shows a projection of the unit cell of the crystal-chemically isotypic mixed-cationic amides K2Li(NH2)3 and K2Na(NH2)3. The coordination of the alkali metal cations by amide anions is thoroughly discussed.