Unique and contrasting mixed-metal lithium-calcium and lithium-barium hexamethyldisilazide complexes

摘要

Addition of lithium hexamethyldisilazide to calcium or barium bis(hexamethyldisilaxide)in THF resulted in the synthesis of two unique but very different mixed-metal complexes:X-ray crystallography shows these to be, respectively,the heterobimetallic complex [Ca{N(SiMe_3)_2Li(THF)](1),containing two calcium-lithium bridging amide ligands and the remarkable co-crystalline compound [Ba{N(SiMe_3)_2}_2(THF)_3][Li_2{N(SiMe_3)_2}_2(THF)_2](2).