Penta- and Hexacoordinated Si Compounds with Heavier Pnictogens P

4 Penta- and Hexacoordinated Si Compounds with Heavier Pnictogens (P) 

To date hypercoordinated Si compounds with As, Sb, or Bi in the silicon coordination sphere have not been reported with any crystallographic evidence of their bonding situation. Phosphorus atoms in the coordination shell of such Si compounds, however, have been reported and the P-donor moieties cover the two classes of neutral (phosphane) and anionic (phosphanide) ligands. 

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