New Porous Structures from Layered Phosphonates
Porous compounds were obtained in the formation of zirconium biphenyldiphosphonate, Zr(O3PC6H4-C6H4 PO3). The compounds are layered with an interlayer separation of 13.8Å. The layers are cross-linked into a three dimensional structure by virtue of the phosphonic acid bonding across two adjacent layers. It would be expected that this compound would be non-porous since the distance between adjacent organic pillars (crosslinks) along the layers is 5.3Å. Three types of products were obtained, those with an average pore radius ≈25Å, those containing micropores as well as mesopoers of 20–25Å radius and products with only layer mesopores. Surface areas ranged from 100–400m2/g.
Porous compounds were also prepared from layered double hydroxides of general composition M(II)nM(III)(OH)2n+2x. Diphosphonic acids of the type H2O3P(C6H4)nPO3H2, n=1, 2, 3 were intercalated into the layered double hydroxides. Upon warming the intercalates, the phosphonate anions bonded to the layers cross-linking them into a three dimensional array with concomitant pore development.
KeywordsLayered Double Hydroxide Phosphonic Acid Zirconium Phosphate Inorganic Layer Average Pore Radius
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