Edwin Weber – författare

Dieses Buch stellt die Ergebnisse des Innovationskollegs Bergbaufolgelandschaften der Brandenburgischen Technischen Universität Cottbus vor. In einem interdisziplinären Ansatz wurden Grundlagen zur Abschätzung des Entwicklungspotentials typischer Ökosysteme der Niederlausitzer Bergbaufolgelandschaften geschaffen. Dieser Band bietet wertvolle Informationen für alle, die sich mit Rekultivierung, spontaner Wiederbesiedlung sowie Wasserhaushalt und Wasserqualität in Bergbaufolgelandschaften des Braunkohletagebaus beschäftigen.

1. F.H. Kohnke, J. Mathias, J.F. Stoddart: Substrate-Directed Synthesis: The Rapid Assembly of Novel Macropolycyclic Structures via Stereoregular Diels-Alder Oligomerizations 2. S.C. Zimmerman: Rigid Molecular Tweezers as Hosts for the Complexation of Neutral Guests 3. A. Collet, J.-P. Dutasta, B. Lozach, J. Canceill: Cyclotriveratrylenes and Cryptophanes: Their Synthesis and Applications to Host-Guest Chemistry and to the Design of New Materials 4. J.-C. Chambron, Ch.D. Dietrich-Buchecker, S. Misumi: From Classical Chirality to Topologically Chiral Catenands and Knots 5. S. Misumi: Recognitory Coloration of Cations with Chromoacerands 6. D.A. Tomalia, H.D. Durst: Genealogically Directed Synthesis: Starburst/Cascade Dendrimers and Hyperbranched Structures

The lively interest in organic solids stems from our increasing ability to manipulate and tune the properties of organic and organometallic materials (e.g. nonlinear behavior or electrical conductivity) by systematic variations of the molecular components. New insight derived from modern supramolecular chemistry are also allowing molecular level control of solid-state structure with the arrangement of functional molecular components into a defined solid architecture. Examples include the creation of nanoporous host lattices containing functional guest molecules and of defined nanomaterials. In this book, leading experts in the field give a state-of the art overview of our current knowledge and of future prospects, with chapters on directional aspects of intermolecular interactions, supramolecular synthon approaches, hydrogen-bonded tape, ribbon and sheet motifs, designed organic zeolite analogues, and crystalline polymorphism.

Considering the high level of our knowledge concerning covalent bond formation in the organic chemistry of molecules, our understanding of the principles involved in organic solid design is almost in its infancy. While chemists today are able to synthesize organic molecules of very high complexity using sophisticated methods of preparation, they lack general approaches enabling them to reliably predict organic crystalline or solid structures from molecular descriptors - no matter how simple they are. On the other hand, nearly all the organic matter surrounding us is not in the single-molecule state but aggregated and condensed to form liquid or solid molecular assemblages and structural arrays giving rise to the appearances and properties of organic compounds we usually observe. Obviously, the electrical, optical or magnetic properties of solid organic materials that are important requirements for future technologies and high-tech applications, as well as the stability and solubility behavior of a medicament depend on the structure of the molecule and the intramolecular forces, but even more decisively on the intermolecular forces, i. e. the packing structure of the molecules to which a general approach is lacking. This situation concerned ]. Maddox some years ago to such a degree that he described it as "one of the continuing scandals in the physical sciences" [see (1998) Nature 335:201; see also Ball, P. (1996) Nature 381:648]. The problem of predicting organic solid and crystal structures is very dif- cult.

The lively interest in organic solids stems from our increasing ability to manipulate and tune the properties of organic and organometallic materials (e.g. nonlinear behavior or electrical conductivity) by systematic variations of the molecular components. New insight derived from modern supramolecular chemistry are also allowing molecular level control of solid-state structure with the arrangement of functional molecular components into a defined solid architecture. Examples include the creation of nanoporous host lattices containing functional guest molecules and of defined nanomaterials. In this book, leading experts in the field give a state-of the art overview of our current knowledge and of future prospects, with chapters on directional aspects of intermolecular interactions, supramolecular synthon approaches, hydrogen-bonded tape, ribbon and sheet motifs, designed organic zeolite analogues, and crystalline polymorphism.

1. F.H. Kohnke, J. Mathias, J.F. Stoddart: Substrate-Directed Synthesis: The Rapid Assembly of Novel Macropolycyclic Structures via Stereoregular Diels-Alder Oligomerizations 2. S.C. Zimmerman: Rigid Molecular Tweezers as Hosts for the Complexation of Neutral Guests 3. A. Collet, J.-P. Dutasta, B. Lozach, J. Canceill: Cyclotriveratrylenes and Cryptophanes: Their Synthesis and Applications to Host-Guest Chemistry and to the Design of New Materials 4. J.-C. Chambron, Ch.D. Dietrich-Buchecker, S. Misumi: From Classical Chirality to Topologically Chiral Catenands and Knots 5. S. Misumi: Recognitory Coloration ofCations with Chromoacerands 6. D.A. Tomalia, H.D. Durst: GenealogicallyDirected Synthesis: Starburst/Cascade Dendrimers and Hyperbranched Structures

1. P. Knops, N. Sendhoff, H.-B. Mekelburger, F. Voegtle, Bonn/FRG HighDilution Reactions - New Synthetic Applications 2. A. Ostrowicki, E. Koepp, F. Voegtle, Bonn/FRG The "Cesium Effect": Syntheses of Medio- and Macrocyclic Compounds 3. J. Dohm, F. Voegtle, Bonn/FRG Synthesis of (Strained) Macrocycles by Sulfone Pyrolysis 4. Q. Meng, M. Hesse, Zurich/Switzerland Ring Closure Methods in the Synthesis of Macrocyclic Natural Products 5. J.L. Sessler, A.K. Burrell, Austin, TX/USA Expanded Porphyrins