Reversible Dehydration
Behavior Reveals Coordinatively
Unsaturated Metal Sites in Microporous Aluminum Phosphonates
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Abstract
Incorporation of the same ligand
into three different aluminum
phenylenediphosphonates (Al(H<sub>2</sub>O)(O<sub>3</sub>PC<sub>6</sub>H<sub>4</sub>PO<sub>3</sub>H) (<b>1</b>), Al<sub>4</sub>(H<sub>2</sub>O)<sub>2</sub>(O<sub>3</sub>PC<sub>6</sub>H<sub>4</sub>PO<sub>3</sub>)<sub>3</sub> (<b>2</b>), and Al<sub>4</sub>(H<sub>2</sub>O)<sub>4</sub>(O<sub>3</sub>PC<sub>6</sub>H<sub>4</sub>PO<sub>3</sub>)<sub>2.84</sub>(OH)<sub>0.64</sub> (<b>3</b>)) was accomplished by varying the synthetic conditions.
The compounds have different sorption properties; however, all exhibit
reversible dehydration behavior. The structures of the hydrated and
dehydrated phases were determined from powder X-ray diffraction data.
Compounds <b>2</b> and <b>3</b> were found to be microporous,
while compound <b>1</b> was found to be nonporous. The stability
of the dehydrated phase and the resulting porosity was found to be
influenced by the change in the structure upon loss of water
