Cucurbituril: organic molecular porous material with permanent porosity, exceptional stability, and acetylene sorption properties.
National Creative Research Initiative Center for Smart Supramolecules and Department of Chemistry, Pohang University of Science and Technology, San 31 Hyoja-dong, Pohang 790-784, Republic of Korea.Angewandte Chemie International Edition (Impact Factor: 13.73). 02/2008; 47(18):3352-5. DOI:10.1002/anie.200800772
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ABSTRACT: Metal-organic microporous materials (MOMs) have attracted wide scientific attention owing to their unusual structure and properties, as well as commercial interest due to their potential applications in storage, separation and heterogeneous catalysis. One of the advantages of MOMs compared to other microporous materials, such as activated carbons, is their ability to exhibit a variety of pore surface properties such as hydrophilicity and chirality, as a result of the controlled incorporation of organic functional groups into the pore walls. This capability means that the pore surfaces of MOMs could be designed to adsorb specific molecules; but few design strategies for the adsorption of small molecules have been established so far. Here we report high levels of selective sorption of acetylene molecules as compared to a very similar molecule, carbon dioxide, onto the functionalized surface of a MOM. The acetylene molecules are held at a periodic distance from one another by hydrogen bonding between two non-coordinated oxygen atoms in the nanoscale pore wall of the MOM and the two hydrogen atoms of the acetylene molecule. This permits the stable storage of acetylene at a density 200 times the safe compression limit of free acetylene at room temperature.Nature 08/2005; 436(7048):238-41. · 38.60 Impact Factor
Article: Self-assembling peptide nanotubes[show abstract] [hide abstract]
ABSTRACT: Biological proteins and peptides have the intrinsic ability to self-assemble into elongated solid nanofibrils , , , , ,  and , which may give rise to amyloid diseases , ,  and  or inspire applications ranging from tissue engineering to nanoelectronics , , ,  and . Proteinaceous fibrils are extensively studied and well understood, to the extent that detailed theoretical models have been proposed that explain and predict their behavior  and . Another intriguing state of protein-like self-assembly is that of nanotubes (NTs), defined here as an elongated nano-object with a definite inner hole. In contrast to proteinaceous fibrils, nanotubes are much less frequently observed and far less well understood. However, they have attracted research interest internationally as key components for nanotechnology.Nano Today. 01/1996;
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ABSTRACT: A strategy based on reticulating metal ions and organic carboxylate links into extended networks has been advanced to a point that allowed the design of porous structures in which pore size and functionality could be varied systematically. Metal-organic framework (MOF-5), a prototype of a new class of porous materials and one that is constructed from octahedral Zn-O-C clusters and benzene links, was used to demonstrate that its three-dimensional porous system can be functionalized with the organic groups -Br, -NH2, -OC3H7, -OC5H11, -C2H4, and -C4H4 and that its pore size can be expanded with the long molecular struts biphenyl, tetrahydropyrene, pyrene, and terphenyl. We synthesized an isoreticular series (one that has the same framework topology) of 16 highly crystalline materials whose open space represented up to 91.1% of the crystal volume, as well as homogeneous periodic pores that can be incrementally varied from 3.8 to 28.8 angstroms. One member of this series exhibited a high capacity for methane storage (240 cubic centimeters at standard temperature and pressure per gram at 36 atmospheres and ambient temperature), and others the lowest densities (0.41 to 0.21 gram per cubic centimeter) for a crystalline material at room temperature.Science 02/2002; 295(5554):469-72. · 31.20 Impact Factor
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