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- W2024156954 abstract "Die Synthese der lipophile Strukturelemente (o-, m-, p-Phenylen-, Biphenyl- und Pyridin-Kerne) enthaltenden neuen Cryptandsysteme 1–17 und 27–32 wird mitgeteilt. In der Reihe 15–17 ist das Diaza[2.2]kronenethersystem jeweils durch zwei starre p-Phenylen-, 4,4′-Biphenyl- und 2-Nitro-m-phenylen-Bausteine als „Spacer”︁-Gruppen in fixiertem Abstand auseinandergehalten, so daß Modellsubstanzen für kanalbildende Ionentransport-Systeme entstehen. Von einigen der neuen Neutralliganden mit variierter Hohlraumgröße und Donoratomzahl wurden kristalline Alkalimetallion-Komplexe dargestellt. Die Komplexkonstanten von 27–32 werden im Hinblick auf eine π-Donorbeteiligung von Arenringen an der Koordination der Alkalimetall-Kationen verglichen. Durch temperaturabhängige 13C-NMR-Spektren wird die gehinderte Rotation von P-Phenylen-Einheiten quantitativ untersucht. Ligand Structure and Complexation, XXX. Lipophilic and Conformationally Hindered Cryptands The synthesis of the new cryptand systems 1–17 and 27–32 with lipophilic structural elements (like O, m-, p-phenylene, biphenyl, and pyridine nuclei) is reported. The diaza[2.2]crown ether system of the series 15–17 is held apart at a fixed distance by two p-phenylene. 4,4-biphenyl, and 2-nitro-m-phenylene systems thus providing model compounds for channel building ion transport systems. A few of the neutral ligands displaying varying cavity size and numbers of donor atoms give crystalline alkali metal ion complexes. The alkali and alkaline-earth complex constants of the diazacrown ether systems 27–32 are compared to elucidate the extent of donor participation of arene rings in the coordination. By means of temperature-dependent13 C NMR spectroscopy. the conformationally hindered rotation of the p-phenylene units is quantitatively studied." @default.
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- W2024156954 date "1979-02-01" @default.
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- W2024156954 title "Ligandstruktur und Komplexierung, XXX. Lipophile und konformativ gehinderte Cryptanden" @default.
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- W2024156954 doi "https://doi.org/10.1002/cber.19791120218" @default.
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