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  • Inorganic Chemistry  (16)
  • host/guest chemistry  (4)
  • complex formation  (2)
  • 1985-1989  (21)
  • 1
    Electronic Resource
    Electronic Resource
    Bausteine für funktionalisierte carbocyclische Grosshohlräume — Methanol-Clathrat eineso-Terphenylophans (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 135-146 
    Details
    ISSN: 1573-1111
    Keywords: Guest molecules ; host/guest chemistry ; host molecules ; inclusion (of molecules) ; large rings ; macrocyclic compounds ; receptor model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The syntheses of the functionalized carbomacrocycles5–11 are reported. The diastereomeric diols10a, b form a stable methanol clathrate. The X-ray analysis of9 gives insight into the dimensions of the cavity. In the course of the preparation of4 the side products22 and23 have been characterized. Aldol condensations are also used for the syntheses of the 30-membered ring15 and of its hydrogenation product16. The diesters12–14 have been prepared to make available functionalized carbomacrocycles with high ring member numbers by acyloin condensation. In this connection, the 28-membered tetra-yne20 and its precursors18 and19 are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655928
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  • 2
    Electronic Resource
    Electronic Resource
    A new host compound for the selective inclusion of ethanol (1986)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 4 (1986), S. 163-167 
    Details
    ISSN: 1573-1111
    Keywords: Alcohol inclusion ; clathrate ; clathrand ; enrichment of ethanol ; host/guest chemistry ; inclusion ; lattice inclusion ; separation of solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new host compound of the onium salt type,N-(3-biphenylmethyl)quininium bromide (1), is described. This host compound shows an unusually high selectivity for the inclusion of ethanol. Using this clathrand, ethanol can be extracted from a variety of solvent mixtures. In most cases, a remarkable enrichment of the ethanol is observed. The following solvents in a mixture with ethanol remain in the mother liquid: methanol,n-propanol,n-hexane, pyridine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00655930
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  • 3
    Electronic Resource
    Electronic Resource
    The rhodium complex of a tris(bipyridine) ligand—Its electrochemical behaviour and function as mediator for the regeneration of NADH from NAD+ (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 695-707 
    Details
    ISSN: 1573-1111
    Keywords: Bipyridine ; bipyridine ligand ; complexation ; complex chemistry ; complex formation ; cyclovoltammetry ; electrochemical mediator ; electrochemical reduction ; electrochemistry ; NAD+ ; NADH ; Rh3+ ; Rh+ ; Rh complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The tris-bipyridine ligand3a and its stoichiometric Rh3+ complex have been prepared. Cyclovoltammograms of the complex at pH 7.4 using a glassy carbon disk electrode reveal a strong reduction peak at −620 mV and two weak reduction peaks at more negative voltage. The reduction potential of the new complex is shifted by 300 mV to more positive values as compared to [Rh(bipy)3]3+. There is no reversible reoxidation peak of the Rh(I) complex formed due to the decomplexation of one of the three bipyridine units in the course of the transition Rh(III)→Rh(I). The Rh(III) complex of3a was also studied with respect to its function as a possible redox mediator for the electrochemical regeneration of NADH from NAD+. The preparative electrolysis of the Rh3+ complex of3a in the presence of NAD+ yields a selective formation of NADH, whereas NAD dimers were not detected. On the other hand, a significant acceleration of this reaction compared to [Rh(bipy)3]3+ was not observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656589
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  • 4
    Electronic Resource
    Electronic Resource
    Macrobicyclic hexalactones — Synthesis, host-guest properties and electrochemistry (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 157-165 
    Details
    ISSN: 1573-1111
    Keywords: Benzene inclusion ; cyclovoltammetry ; electrochemistry ; ester ; host/guest chemistry ; lactone ; macrobicyclic compounds ; macrocyclic molecules ; triphenylamine units
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The synthesis of a family of new host type molecules (1–4) bearing six lactone structural units is described. One of the lactones (1) forms crystals which contain benzene in a 1∶2 (host:guest) ratio. The complexation behaviour towards potential guest molecules and the electrochemical properties of the molecules are studied. Compared to an analogous open chained ester (18) the electrochemical potentials of the bicyclic lactones,1, 2 are higher due to the different steric environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00663048
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  • 5
    Electronic Resource
    Electronic Resource
    Macrotricyclic host molecules with basket shaped cavities (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 429-442 
    Details
    ISSN: 1573-1111
    Keywords: Cavity ; complex formation ; ethanol adduct ; ethanol inclusion ; host/guest chemistry ; inclusion compounds ; lactam ; lactone ; macrotricyclic compounds ; perdeuteroethanol ; spacer groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The syntheses of several macrotricyclic hexalactams (1–3) and of a corresponding hexalactone (4) are described in detail for the first time. The molecules have a basket shaped skeleton and contain a non-collapsible cavity, the size and shape of which is varied by use of spacer groups. Compounds1–3 selectively form crystalline adducts with ethanol as guest; the macrotricyclic hexaester4 does not. Evidence for an interaction of1 with ethanol was obtained by exchange experiments with perdeuteroethanol. Complexation experiments in solution did not show significant host/guest interactions with the guest chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658985
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  • 6
    Electronic Resource
    Electronic Resource
    Drei- und sechsfach verbrückte phenyloge Cyclophane (1988)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 121 (1988), S. 2179-2185 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Three- and Sixfold Bridged Phenylogous CyclophanesThe syntheses of the threefold bridged cyclophanes 4, 5, of the sixfold bridged cyclophane 6, and of the triple-layered cyclophanes 7, 8 are reported. The yields have been optimized by variation of the reaction conditions and by use of the cesium effect. The enantiomer resolution of 7 and the X-ray structural analysis of 4 are discussed.
    Notes: Die dreifach verbrückten Cyclophane 4, 5, das sechsfach verbrückte Phan 6 und die Tripeldecker-Verbindungen 7, 8 werden beschrieben. Die Ausbeuten werden durch Variation verschiedener Bedingungen und durch den Cäsium-Effekt optimiert. Die Enantiomerentrennung von 7 und die Röntgen-Kristallstrukturanalyse von 4 werden mitgeteilt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19881211217
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  • 7
    Electronic Resource
    Electronic Resource
    Chromoinophore, VI. Neue Chromoionophore mit Azulen-Bausteinen und hoher Ba2+-Farbselektivität (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 905-913 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chromoionophores, VI. New Chromoionophores with Azulene Units and High Color Selectivity for Ba2+ IonsThe neutral ligand 2b in solution (acetonitrile) shows a color change from yellowish-orange to blueish-violet on addition of barium salts. Relatively little alterations of color from orange up to red are effected by other alkali and alkaline earth metal salts. The syntheses, spectroscopic investigations, and cation selectivities of the new 6-aminoazulene coronands 2a, b and 3 are described. The band shifts in the absorption spectra are discussed in view of dipole moment changes of the azulene system proceeding from the ground- to the photoexcited state.
    Notes: Der Neutralligand 2b zeigt in Lösung (Acetonitril) auf Zugabe von Bariumsalzen einen Farbumschlag von gelborange nach blauviolett, während er mit anderen Alkali- und Erdalkalimetallsalzen nur vergleichsweise geringe Farbänderungen nach orange bis rot bewirkt. Synthesen, spektroskopische Untersuchungen und Kationselektivitäten der neuen 6-Aminoazulen-Kronenderivate 2a, b und 3 werden beschrieben. Die Veränderungen der Absorptionsspektren der Liganden bei Salzzusatz werden im Hinblick auf Diplomoment-Änderungen des Azulensystems beim Übergang vom Grund- zum photoangeregten Zustand erörtert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180308
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  • 8
    Electronic Resource
    Electronic Resource
    Chromoionophore, VII. Podanden mit Elektronen-Donor- und -Acceptor-Endgruppen und kationgesteuerter Charge-Transfer-Absorption (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 914-921 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chromoionophores, VII. Podands Carrying Terminal Electron-Donor- and -Acceptor Groups. Cation-Influenced Charge Transfer AbsorptionThe synthesis and spectroscopic investigation of the new noncyclic neutral ligands 12-20 of the glycol ether type (podands) carrying terminal electron-donor- and -acceptor groups are described. The podands show intramolecular charge transfer interactions which can be influenced selectively by complexed cations. The ligands 13 and 20 cause significant increases of extinction and bathochromic shifts of the charge transfer bands in the UV/Vis spectra on addition of alkali perchlorates, whereas the shorter ligands 14 and 18 show a decrease of extinction and hypsochromic shifts under similar conditions. Some of the noncyclic chromoionophores discern considerably and visually perceivably between Na+ and K+ or Li+ and Na+, respectively, in acetonitrile. The cation selective alterations in the electron spectra are discussed in view of steric effects considering some complex stability constants determined by photometric titrations.
    Notes: Synthese und spektroskopische Untersuchung der neuen nichtcyclischen Neutralliganden 12-20 von Glycolether-Typ (Podanden) mit Elektronen-Donor- und -Acceptor-Endgruppen werden beschrieben. Die Podanden zeigen intramolekulare Charge-Transfer-Wechselwirkungen, die durch komplexierte Kationen selektiv beeinflußt werden. Während bei den Liganden 13 und 20 mit Alkalimetallperchloraten signifikante Extinktionszunahmen und bathochrome Verschiebungen der Charge-Transfer-Banden in den UV/Vis-Spektren auftreten, beobachtet man bei den kürzerkettigen Liganden 14 und 18 unter analogen Bedingungen Extinktionsverminderung und Hypsochromie. Einige der offenkettigen Chromoionophore differenzieren in Acetonitril stark und visuell gut wahrnehmbar zwischen Na+ und K+ bzw. Li+ und Na+. Die kationselektiven Veränderungen in den Elektronenspektren der Chromoionophore werden, unter Berücksichtigung einiger durch photometrische Titration ermittelter Komplexkonstanten, im Hinblick auf sterische Effekte bei der Komplexierung erörtert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180309
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  • 9
    Electronic Resource
    Electronic Resource
    Neue planarchirale [2.2]Phane - Synthese, Struktur und chiroptische Eigenschaften (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4433-4438 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Planarchiral [2.2]Phanes - Syntheses, Structures, and Chiroptical PropertiesPreparation, conformations and chiroptical properties of the ten-membered, planarchiral naph-thalinophanes 4, 5 (heterocyclic) and 6-8 (carbocyclic) are described. 4 and 6 are chromatographically enriched using (-)-α-(2,4,5,7-tetranitro-9-fluorenylideneaminooxy)propionic acid (TAPA). Optical rotations and circular dichroisms of 4 and 6 are determined. The anti conformations are ascertained for 4 and 6-8 by 1H NMR spectroscopy, whereas a conformational flexible syn conformation is supposed for 5.
    Notes: Darstellung, Konformationen und chiroptische Eigenschaften der zehngliedrigen planarchiralen Naphthalinophane 4, 5 (heterocyclisch) und 6-8 (carbocyclisch) werden beschrieben. Die Enantiomeren von 4 und 6 werden mitteldruckchromatographisch an (-)-α-(2,4,5,7-Tetranitro-9-fluorenylidenaminooxy)propionsäure (TAPA) angereichert und polarimetrisch und circulardichrographisch untersucht. 1H-NMR-Spektren belegen die anti-Konformationen für 4 und 6-8, während sie für 5 eine konformativ flexible syn-Konformation nahelegen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181114
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  • 10
    Electronic Resource
    Electronic Resource
    4,4′-Donor-substituierte und 6,6′-difunktionalisierte 2,2′-Bipyridine (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 589-591 
    Details
    ISSN: 0009-2940
    Keywords: 2,2′-Bipyridines, building blocks for complex ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4,4′-Donor-Substituted and 6,6′-Difunctionalized 2,2′-BipyridinesThe previously unknown 4,4′-dimethoxy-substituted 6,6′-diacyl-2,2′-bipyridines 7, 8 (acyl = acetyl, formyl) are prepared. Some old procedures in the synthetic sequence were optimized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220330
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