Crystal Structure of 2,2-Bis(Trimethylsilylamino)-Tetrachlorocyclotriphosphazene

摘要

Tetrachlorocyclotriphosphazene crystals have unique observed reflections. The phosphazene ring lies on a crystallographic 2-fold axis and is planar within 0.031(5)A. The exo P-N bond distance is 1.609(5) and the Si-N bond distance is 1.757(5)A which suggests preferential nitrogen lone pair delocalization to the phosphorus atom. P-N distances in the ring alternate (from the P with the exo N atoms) from 1.617(5) to 1.551(5) to 1.591(4)A. The structural and 31 phosphorus 31 nmr parameters of 2,2-N3P3C14NHS;Me3)2 are compared to the analogous tert-butylamino derivative.