Bis(tetraphenylimidodiphosphinato)tin(II) and ‐tin(IV) Dihalides. Conversion of Pseudo Trigonal Bipyramidal to Octahedral Geometry

Abstract

Abstract The tetraphenylimidodiphosphinate [ N‐(P,P ‐diphenylphosphinoyl)‐P,P‐diphenylphosphinimidate] ion forms stable bis‐chelates with Sn II and Sn IV . The Sn II compound [N(Ph 2 PO) 2 ] 2 Sn ( 3 ) displays a distorted Ψ‐tbp structure in the solid state and is fluxional in solution. The bis(imidodiphosphinato)tin dihalides 6 are cis ‐structured. A comparison of the X‐ray structures of 3 and the diiodide [N(Ph 2 PO) 2 ] 2 SnI 2 ( 6c ) indicates the presence of a lone‐pair stereochemical effect in 3 which is absent in 6c .