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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0570-0833
    Keywords: Supramolecular chemistry ; Cage compounds ; Cyclophanes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Supramolecular chemistry is a new area of research that has rapidly developed from pure synthetic chemistry, and its novelty has led to interdisciplinary cooperation between organic and inorganic chemistry, biochemistry, physical and theoretical chemistry, and physics. Whereas molecular chemistry essentially deals with the covalent bonding of atoms, Supramolecular chemistry is predominantly involved in the study of the weaker intermolecular interactions resulting in the association and self-organization of several components to form larger aggregates (supramolecules). The first crown ether discovered by the subsequent Nobel prizewinner Pedersen was more the fortuitous reaction product of an impurity, but nowadays, some twenty-five years later, chemists are able to tailor host molecules to special requirements. Host compounds having a cyclophane skeleton make an important contribution, since their aromatic structural units ensure the necessary rigidity of the molecular structures and thereby improve the preorganization of the coordination sites for the cooperative binding of the guests. During the course of the rapid development of Supramolecular chemistry such a large number of synthetic hosts has been developed and their interaction with guests studied in such depth that we must restrict ourselves here to a discussion of a particular group of host compounds, namely cavity-supporting macrobicyclic and macrooligocyclic phanesu, which bear a similar relation to open-chain and monocyclic hosts as the metal-complexing cryptands to the podands and crown ethers. The molecular architecture of these three-dimensionally bridged macrooligocycles is a challenge for synthetic chemistry. (Not only the size and shape of the intramolecular cavity, but also the provision of the latter with suitable coordination centers have to be included in the synthesis strategy.) The capacity for the envelopment of guests from all sides and the expedient endo functionalization often also produce a particularly strong binding of host and guest, outstanding selectivities with regards to molecular recognition, and special properties of the Supramolecular complexes.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 1112-1113 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 103 (1991), S. 433-436 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 542-563 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die supramolekulare Chemie ist ein junges Forschungsgebiet, das rasch der reinen Synthese-chemie entwachsen ist und das aufgrund seiner Neuartigkeit zur interdisziplinären Zusammenarbeit von Organischer und Anorganischer Chemie, Biochemie, Physikalischer und Theoretischer Chemie und Physik geführt hat. Beruht die molekulare Chemie im wesentlichen auf der kovalenten Bindung von Atomen, so untersucht die supramolekulare Chemie vornehmlich die schwächeren zwischenmolekularen Wechselwirkungen, welche die Assoziation und Selbstorga-nisation mehrerer Komponenten zu größeren Aggregaten (Supramolekülen, Übermolekülen) zur Folge haben. War der erste Kronenether des späteren Nobelpreisträgers Pedersen noch das eher zufällige Reaktionsprodukt einer Verunreinigung, ist man heute, ein Vierteljahrhundert später, in der Lage, Wirtmoleküle für spezielle Anforderungen maßzuschneidern. Einen wichtigen Beitrag leisten Wirtverbindungen mit Cyclophangerüst, weil ihre aromatischen Bausteine die erforderliche Starrheit der Molekülstrukturen gewährleisten und so die Präorganisation der Koordinationsstellen für die kooperative Bindung der Gäste erhöhen. Im Zuge der stürmischen Entwicklung der supramolekularen Chemie ist eine so große Zahl synthetischer Wirte entwickelt und auf ihre Wechselwirkung mit Gästen hin untersucht worden, daß wir uns hier auf die Diskussion einer besonderen Gruppe von Wirtverbindungen beschränken müssen, nämlich hohlraumaufspannende makrobi- und -oligocyclische Phane, die sich zu offenkettigen und monocyclischen Wirten verhalten wie metallkomplexierende Cryptanden zu Podanden und Kronenethern. Die molekulare Architektur dieser sphärisch verbrückten Makrooligocyclen ist eine Herausforderung für die Synthesechemie. In die Synthesestrategie ist nicht nur die Größe und Gestalt des intramolekularen Hohlraums einzubeziehen, sondern auch dessen Belegung mit geeigneten Koordinationszentren. Die Fähigkeit zur allseitigen Ummantelung von Gästen und eine zweckmäßige endo-Funktionalisierung bewirken oftmals auch eine besonders starke Wirt-Gast-Bindung, ausgeprägte Selektivitäten bei der molekularen Erkennung sowie besondere Eigenschaften der supramolekularen Komplexe.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
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    Kiel und Hamburg: ZBW - Deutsche Zentralbibliothek für Wirtschaftswissenschaften, Leibniz-Informationszentrum Wirtschaft
    Publication Date: 2015-05-08
    Description: This paper introduces a class of contest models in which each player decides when to stop a privately observed Brownian motion with drift and incurs costs depending on his stopping time. The player who stops his process at the highest value wins a prize. We prove existence and uniqueness of a Nash equilibrium outcome and derive the equilibrium distribution in closed form. As the variance tends to zero, the equilibrium outcome converges to the symmetric equilibrium of an all-pay auction. For two players and constant costs, each player's equilibrium pro fit decreases if the drift increases, the variance decreases, or the costs increase.
    Keywords: C72 ; C73 ; D44 ; ddc:330
    Language: English
    Type: doc-type:conferenceObject
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  • 8
    facet.materialart.
    Unknown
    Kiel und Hamburg: ZBW - Deutsche Zentralbibliothek für Wirtschaftswissenschaften, Leibniz-Informationszentrum Wirtschaft
    Publication Date: 2015-02-17
    Description: This paper analyzes a two-player all-pay auction with incomplete information. More precisely, one bidder is uncertain about the size of the initial advantage of his rival modeled as a head start in the auction. I derive the unique Bayesian Nash equilibrium outcome for a large class of cumulative distribution functions over head starts. In equilibrium, the stronger player generates an informational rent if and only if his head start distribution is not stochastically dominated by a uniform distribution. This result introduces a new perspective on lobbying contests and procurement contests.
    Keywords: C72 ; C73 ; D72 ; ddc:330
    Language: English
    Type: doc-type:conferenceObject
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  • 9
    facet.materialart.
    Unknown
    München: Sonderforschungsbereich/Transregio 15 - Governance and the Efficiency of Economic Systems (GESY)
    Publication Date: 2020-05-19
    Description: This paper presents a strategic model of risk-taking behavior in contests. Formally, we analyze an n-player winner-take-all contest in which each player decides when to stop a privately observed Brownian Motion with drift. A player whose process reaches zero has to stop. The player with the highest stopping point wins. Contrary to the explicit cost for a higher stopping time in a war of attrition, here, higher stopping times are riskier, because players can go bankrupt. We derive a closed-form solution of the unique Nash equilibrium outcome of the game. In equilibrium, the trade-off between risk and reward causes a non-monotonicity: highest expected losses occur if the process decreases only slightly in expectation.
    Keywords: C72 ; C73 ; D81 ; ddc:330 ; Discontinuous games ; Contests ; Relative performance pay ; Risktaking behavior ; Entscheidung bei Risiko ; Glücksspiel ; Nichtkooperatives Spiel ; Test
    Language: English
    Type: doc-type:workingPaper
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