Potassium complexes magnesiates

In the solvent-separated potassium magnesiate [(IPr)2K] [MgHMDS3] 73 (Fig. 46), the K cation is coordinated to two IPr NHC ligands. Complex 73 represents a unique example whereby two neutral IPr ligands are a-bound to a potassium in a near-linear arrangement forming the [(IPr)2K]" cation of 73. This is the first example of a K complex where the metal is solely coordinated to NFIC donor ligands. 

---