Abstract
This work reports a new three-dimensional flexible lanthanide metal-organic framework [La(BTB)(H2O)·3DMF]n (BTB = 1,3,5-tris(4-carboxyphenyl) benzene) that possesses a rare chiral space group (P6522), very high thermal stability (560 °C), and high surface area (1014 m2 g-1). This new MOF demonstrates a large adsorption hysteresis loop on the N2 isotherm at 77 K after activation at 300 °C. Powder X-ray thermodiffraction experiments reveal that structural transformation occurs upon removal of guest molecules. The as-synthesized material is the "open" form, while the activated sample is "closed". Adsorption isotherms of CO2 exhibit a dramatic step near a relative pressure of 0.3, which is similar to the location of the step in the N2 isotherm at 77 K. Upon desorption, the material transforms to the closed form near a reduced pressure of 0.15, where it collapses back to the adsorption isotherm. Adsorption kinetic studies show that equilibrium is reached more slowly during the opening/closing steps compared to adsorption loadings measured on the static portion of the isotherm.
Original language | English (US) |
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Pages (from-to) | 10172-10178 |
Number of pages | 7 |
Journal | Journal of Materials Chemistry |
Volume | 22 |
Issue number | 20 |
DOIs | |
State | Published - May 28 2012 |
Externally published | Yes |
ASJC Scopus subject areas
- General Chemistry
- Materials Chemistry