Synthesis and Stability of Mixed Ligand Zirconium Phosphonate Layered Compounds
- Additional Document Info
- View All
The synthesis of layered phosphonates of zirconium was carried out using ligands which were combinations of phenylphosphonic acid and either phosphoric or phosphorus acid. At high ratios of phosphate to phenylphosphonic acid in the presence of HF a staged or interstratified product was obtained in which layers of pure phosphate alternated with those of phenyl pendant groups. At lower ratios of phosphate to phosphonate both ligands are randomly dispersed on the layers with compositions Zr(O3PC6H5)x (HPO4)2-x, where x = 0.7-1. When the second ligand was phosphite, a greater variety of products were obtained. In the case where both ligands were randomly dispersed on the layers, the interlayer distances ranged from 15.5 Å (almost all phenylphosphonate) to 10.4 Å (mostly phosphite). This latter spacing arises from each phenyl group in one layer lying opposite a phosphite group in the adjacent layers. Interstratified phosphonate phosphites were also obtained. The behavior of these mixed derivatives on sulfonation under fuming sulfuric acid is also described. © 1995 Academic Press. All rights reserved.
author list (cited authors)
Clearfield, A., Wang, J. D., Tian, Y., Stein, E., & Bhardwaj, C.