Structure and Conformation of the Medium-Sized Chlorophosphazene Rings
| Autor: | Eric B. Twum, Linlin Li, Claire A. Tessier, David J. Bowers Bowers, Wiley J. Youngs, Brian D. Wright, Anthony Schultz, Vincenzo Scionti, Peter L. Rinaldi, Chrys Wesdemiotis, Matthew J. Panzner, Benjamin S. Thome, Bryan C. Katzenmeyer |
|---|---|
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Inorganic Chemistry. 53:8874-8886 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic500272b |
| Popis: | 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 (31)P chemical shifts have been reassigned, and their T1 relaxation times have been obtained. Crystallographic data has been recollected for [PCl2N]5, and the crystal structures of [PCl2N]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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|