Low-Valent Group 14 NHC-Stabilized Phosphinidenide ate Complexes and NHC-Stabilized K/P-Clusters.

The N-heterocyclic carbene (NHC)-stabilized phosphinidenide, SIMesPK [SIMes=1,3-bis(2,4,6-trimethylphenyl)imidazolidine-2-ylidene], was used as an (NHC)P-transfer reagent for the synthesis of the low-valent Group 14 ate complexes K[(SIMesP)3 E] (E=Ge: 2, Sn: 3, Pb: 4), which were characterized by 1 H NMR, 31 P NMR, IR spectroscopy as well as elemental and X-ray analysis. Furthermore, SIMesPK was used in reactions with potassium amides and alkoxides to form the molecular phosphorus-potassium clusters [K4 (SIMesP)2 (hmds)2 ] [5, hmds=N(SiMe3 )2 ] and [K6 (SIMesP)2 (OtBu)4 ] (6). Finally, the reaction of SIMesPK with Li[Al(OC4 F9 )4 ] led to the potassium-rich ionic compound [(SIMesP)4 K5 ][Al(OC4 F9 )4 ] (7).