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  • 1
    Electronic Resource
    Electronic Resource
    Complexation Properties of Preorganized Receptor Molecules for Large, Neutral Guests (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 1577-1586 
    Details
    ISSN: 0947-3440
    Keywords: Host-guest chemistry ; Calix[4]arenes ; Resorcin[4]arenes ; Dimerization ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Receptor molecules with a preorganized cavity were synthesized by combining two resorcin[4]arene and one calix[4]-arene building block. Based on predictions from a computational study which matches hosts and guests, several steroids, sugar derivatives, and alkaloids were selected for complexation studies. Experimentally the complexation of such guests by these receptor molecules was proven by 1H-NMR spectroscopy (association constants of 1.0-6.0 × 102 M-1 in CDCl3). One of these receptors with four hydroxyl groups forms a dimeric capsule (Kdimer = 11 M-1 in CDCl3). Evidence for this dimerization comes from 1H-NMR, FAB MS spectroscopy, and molecular mechanics and dynamics calculations.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970739
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  • 2
    Electronic Resource
    Electronic Resource
    Stable Heterotopic Noncovalent Resorcin[4]arene Assemblies (2000)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 2000 (2000), S. 1727-1734 
    Details
    ISSN: 1434-193X
    Keywords: Self-assembly ; Vapor-pressure osmometry ; Resorcin[4]arenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---Resorcin[4]arene tetracarboxylic acids 5,6 (A) and resorcin[4]arene tetrapyridines 2,3 (P) self-assemble in chloroform solution to form stable heterotopic AP dimers. Data from NMR titration and dilution experiments, as well as from vapor-pressure osmometry (VPO), indicate that the AP dimer is formed with an association constant greater than 107 M-1. Solid-solution extraction experiments are indicative of the formation of a 2:1 trimer (A2P), while self-associated homotopic species (A2 and A3) can be detected by NMR and VPO. Analysis of the heterotopic noncovalent assembly process over a range of compositions shows that these other species are much less stable than the AP heterodimer, which is the exclusive species at an A/P concentration ratio of 1:1 (〉 99.7% of the total at 10 mM).
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    The Modular Approach in Supramolecular Chemistry (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2689-2702 
    Details
    ISSN: 1434-193X
    Keywords: Modular approach ; Building blocks ; Supramolecular chemistry ; Calix[4]arenes ; Resorcin[4]arenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This review describes covalent and non-covalent combinations of building blocks, e.g. calix[4]arenes, resorcin[4]arenes, cyclodextrins, porphyrins, and cyclotriveratrylenes, leading to well-defined large (receptor) molecules.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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