A Robust Porous Material Constructed of Linear Coordination Polymer Chains: Reversible Single-Crystal to Single-Crystal Transformations upon Dehydration and Rehydration

✍ Scribed by Eun Young Lee; Myunghyun Paik Suh

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 152 KB
• Volume: 43
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.200353494

✦ Synopsis

Metal-organic open-framework solids have been the focus of research interest because of their potential applications in molecular adsorption and separation processes, [1][2][3][4] ion exchange, [5,6] catalysis, [7,8] sensor technology, [9][10][11] and optoelectronics. [12] They can be designed and assembled to generate cavities or channels of various sizes and shapes by appropriate choice of the building blocks. [13][14][15][16][17][18] However, despite extensive studies, information on how to design and synthesize metalorganic frameworks (MOFs) with permanent porosity is still limited. [1, 16,17] Moreover, applications of MOFs are scarce compared to zeolites. This is because 1) they often collapse when the guest molecules occupying the voids are removed, 2) they are in general thermally unstable compared with inorganic zeolites and are destroyed at high temperatures (> 200 8C) or even at low temperatures under vacuum, and 3) they are often soluble in solvents and dissociate into their building blocks. [3, 4,[13][14][15] Porous materials that retain their crystallinity during the reversible desorption/adsorption of guest molecules could be relevant as sensing devices.

Here we report a robust metal-organic open framework, namely, [Ni(cyclam)(bpydc)]•5 H 2 O (1), which is constructed of linear coordination polymer chains made of the nickelmacrocyclic complex [Ni(cyclam)](ClO 4 ) 2 (cyclam = 1,4,8,11tetraazacyclotetradecane) and 2,2'-bipyridyl-5,5'-dicarboxylate (bpydc 2À ). Open framework 1 shows a reversible type I [19]