Enhancing
Order and Porosity in a Highly Robust Tin(IV) Triphosphonate Framework
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Abstract
Metal organic frameworks
(MOFs) are noted for crystallinity, stability, and porosity. For many
industrial challenges though, beyond stability to pore activation,
porous materials require high thermal and moisture stability. Here,
we report a Sn(IV) triphosphonate framework, CALF-28, that is highly
robust and porous. CALF-28 was designed based on the known structure
of a divalent metal phosphonate that was 2-fold interpenetrated. It
has strong sustaining interactions but consequently rapidly precipitates,
compromising crystallinity. Using methods to enhance order, and by
analogy to the M(II) analogue, insights to the structure are ascertained
and corroborated by PXRD and gas sorption analysis. CALF-28 has a
surface area >500 m<sup>2</sup>/g and is stable in water
