14514-98-8Relevant articles and documents
Structure and conformation of the medium-sized chlorophosphazene rings
Bowers, David J.,Wright, Brian D.,Scionti, Vincenzo,Schultz, Anthony,Panzner, Matthew J.,Twum, Eric B.,Li, Lin-Lin,Katzenmeyer, Bryan C.,Thome, Benjamin S.,Rinaldi, Peter L.,Wesdemiotis, Chrys,Youngs, Wiley J.,Tessier, Claire A.
, p. 8874 - 8886 (2014)
Medium-sized cyclic oligomeric phosphazenes [PCl2N]m (where m = 5-9) that were prepared from the reaction of PCl5 and NH4Cl in refluxing chlorobenzene have been isolated by a combination of sublimation/extraction and column chromatography from the predominant products [PCl2N]3 and [PCl2N]4. The medium-sized rings [PCl2N]m have been characterized by electrospray ionization-mass spectroscopy (ESI-MS), their 31P chemical shifts have been reassigned, and their T1 relaxation times have been obtained. Crystallographic data has been recollected for [PCl 2N]5, and the crystal structures of [PCl 2N]6, and [PCl2N]8 are reported. Halogen-bonding interactions were observed in all the crystal structures of cyclic [PCl2N]m (m = 3-5, 6, 8). The crystal structures of [P(OPh)2N]7 and [P(OPh)2N]8, which are derivatives of the respective [PCl2N]m, are also reported. Comparisons of the intermolecular forces and torsion angles of [PCl2N]8 and [P(OPh)2N]8 with those of three other octameric rings are described. The comparisons show that chlorophosphazenes should not be considered prototypical, in terms of solid-state structure, because of the strong influence of halogen bonding.
