Cover Picture Enzymatically Derived Sugar-Containing Self-Assembled Organogels with Nanostructured Morphologies (Angew. Chem. Int. Ed. 292006)код для вставкиСкачать
Cover Picture George John, Guangyu Zhu, Jun Li, and Jonathan S. Dordick* Enzymatically synthesized symmetrical trehalose diesters self-assemble into fibrous gel networks in a wide range of organic solvents and at very low gelator concentrations. Gels containing acrylate functionalities can be further stabilized through polymerization. In the presence of added water and the same enzyme, the gels degrade into trehalose, as shown in the cover picture. In their Communication on page 4772 ff., J. S. Dordick et al. describe how combining the principles of supramolecular chemistry and the selectivity of biocatalysis represents a powerful strategy to develop defined functional materials. Concept of Selectivity In his Essay on page 4724 ff., J. A. Berson describes the reception by the scientific community in the first half of the 20th century of the principles of kinetic versus thermodynamic control and explains the physical basis of selectivity. Asymmetric Heterogeneous Catalysis An overview of the concepts of asymmetric heterogeneous catalysis is given in the Review by F. Glorius et al. on page 4732 ff. The central themes are metal–organic catalysts, chiral modifiers, noncovalent immobilization, and the application of solid supports. Composite Materials In their Communication on page 4764 ff., K. Sada, S. Shinkai, and co-workers describe how the anisotropy of l-cystine single crystals leads to their face-selective decoration by gold nanoparticles.