Thermally robust and porous noncovalent organic framework with high affinity for fluorocarbons and CFCs

Teng-Hao Chen, Ilya Popov, Watchareeya Kaveevivitchai, Yu-Chun Chuang, Yu-Sheng Chen, Olafs Daugulis, Allan J. Jacobson and Ognjen Š. Miljanić ()
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Teng-Hao Chen: University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
Ilya Popov: University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
Watchareeya Kaveevivitchai: University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
Yu-Chun Chuang: National Synchrotron Radiation Research Center
Yu-Sheng Chen: Center for Advanced Radiation Source (ChemMatCARS), The University of Chicago, c/o APS/ANL, 9700 South Cass Drive, Argonne, Illinois 60439, USA
Olafs Daugulis: University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
Allan J. Jacobson: University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA
Ognjen Š. Miljanić: University of Houston, 112 Fleming Building, Houston, Texas 77204-5003, USA

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Metal-organic and covalent organic frameworks are porous materials characterized by outstanding thermal stability, high porosities and modular synthesis. Their repeating structures offer a great degree of control over pore sizes, dimensions and surface properties. Similarly precise engineering at the nanoscale is difficult to achieve with discrete molecules, since they rarely crystallize as porous structures. Here we report a small organic molecule that organizes into a noncovalent organic framework with large empty pores. This structure is held together by a combination of [N–H···N] hydrogen bonds between the terminal pyrazole rings and [π···π] stacking between the electron-rich pyrazoles and electron-poor tetrafluorobenzenes. Such a synergistic arrangement makes this structure stable to at least 250 °C and porous, with an accessible surface area of 1,159 m2 g−1. Crystals of this framework adsorb hydrocarbons, CFCs and fluorocarbons—the latter two being ozone-depleting substances and potent greenhouse species—with weight capacities of up to 75%.

Date: 2014
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DOI: 10.1038/ncomms6131

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