Zeolitic imidazolate frameworks

Zeolitic imidazolate frameworks are metal-organic framework carbon dioxide sinks which could be used to keep industrial emissions of carbon dioxide out of the atmosphere. One litre of the crystals could store about 83 litres of CO2. The crystals are non-toxic and require little energy to create, making them an attractive possibility for carbon capture and storage. "The porous structures can be heated to high temperatures without decomposing and can be boiled in water or solvents for a week and remain stable, making them suitable for use in hot, energy-producing environments like power plants." [ [http://www.cbc.ca/technology/story/2008/02/15/tech-carbon-capture.html CBC News] article "New materials can selectively capture CO2, scientists say" published February 15, 2008]

"Twelve zeolitic imidazolate frameworks (ZIFs; termed ZIF-1 to -12) have been synthesized as crystals by copolymerization of either Zn(II) (ZIF-1 to -4, -6 to -8, and -10 to -11) or Co(II) (ZIF-9 and -12) with imidazolate-type links. The ZIF crystal structures are based on the nets of seven distinct aluminosilicate zeolites: tetrahedral Si(Al) and the bridging O are replaced with transition metal ion and imidazolate link, respectively. In addition, one example of mixed-coordination imidazolate of Zn(II) and In(III) (ZIF-5) based on the garnet net is reported. Study of the gas adsorption and thermal and chemical stability of two prototypical members, ZIF-8 and -11, demonstrated their permanent porosity (Langmuir surface area = 1,810 m2/g), high thermal stability (up to 550°C), and remarkable chemical resistance to boiling alkaline water and organic solvents." [ [http://www.pnas.org/cgi/content/abstract/103/27/10186 National Academy of Sciences] article "Exceptional chemical and thermal stability of zeolitic imidazolate frameworks" Published online on June 23, 2006, 10.1073/pnas.0602439103 ]

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Further reading

*http://yaghi.chem.ucla.edu/pdfPublications/Park_Yaghi.pdf