In Situ Synthesis of an Imidazolate-4-amide-5-imidate Ligand and Formation of a Microporous Zinc–Organic Framework with H2-and CO2-Storage Ability

✍ Scribed by Franziska Debatin; Arne Thomas; Alexandra Kelling; Niklas Hedin; Zoltan Bacsik; Irena Senkovska; Stefan Kaskel; Matthias Junginger; Holger Müller; Uwe Schilde; Christian Jäger; Alwin Friedrich; Hans-Jürgen Holdt

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 625 KB
• Volume: 49
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.200906188

✦ Synopsis

Metal-organic frameworks (MOFs) are an emerging class of materials with various potential applications in gas adsorption and separation, [1] catalysis, [2] ion exchange, [3] sensors, [4] photovoltaics, [5] and drug release. [6] Besides a distinct porosity, many of these applications demand a MOF with high chemical and thermal stability, as well as organic linkers with designated chemical or physical functionalities. [7] A recent advance has been the development of a class of MOFs known as zeolitic imidazole frameworks (ZIFs), [8] in which tetrahedral coordinated metal atoms, such as zinc, are linked through N atoms by ditopic imidazolate linkers to form neutral frameworks. These compounds have high chemical and thermal stabilities. Yaghi and co-workers used functionalized imidazolate linkers for synthesizing ZIFs with varying pore diameters and surface polarities. Gas-sorption experiments with the ZIFs revealed high capacities for selective CO 2 uptake; this capacity is influenced primarily by the polar functionalities (NO 2 , CN, Br, Cl). [8b,h] Recently, ZIFs were used as microporous metal-organic frameworks (MMOFs) for the kinetic separation of propane and propene. [8a] Scheme 1. Synthesis of the IMOF [Zn(2)] n (3).