Makrocyclische und acyclische neutrale Ionophore. Einfluss des Ringschlusses auf die Kationenselektivität

Macrocyclic and noncyclic neutral ionophores. Effect of the macrocyclic ring on the ion selectivity A series of macrocyclic 3, 6-dioxaoctanedioic diamides was prepared. Their ion selectivity in membranes was compared with nonmacrocyclic analogues. The ion selectivity as well as the capability to extract ions from aqueous solutions to an organic phase decreases with decreasing ring size.     

Herstellung und Charakterisierung in Membranen von Ionophoren mit Selektivität fü Natrium-Ionen

Preparation of Neutral Sodium-Selective Ionophores and their Characterization in Membrane Electrodes Different ionopbores based on N,N′-dibenzyl-N,N′-diphenyl-1,2-phenylenedioxydiacetamide ( 1 ) have been prepared by substitution of the aromatic ring carrying the ether O-atoms. Substituents of widely different electronegativity (CH₃, CH₃O, CHO, CN NO₂, Br) do not relevantly influence the ion selectivity.     

Farbenreaktionen der Kohlenhydrate, beruhend auf der Bildung von Furfurol; Reaktionen mit Indol und Karbazol

Ohne Zusammenfassung     

Darstellung von neutralen,lipophilen Liganden für Membranelektroden mit Selektivität für Erdalkali-Ionen

The preparation of a series of non-cyclic, electrically neutral ligands, able to selectively complex alkaline earth metal cations, is described. Some of the compounds show high Ca²⁺ selectivity in membrane electrodes.     

Untersuchungen an Metallkatalysatoren. 37. Zum Einfluß der Beladung auf Aktivität und Selektivität von Nickel/Träger-Katalysatoren

Investigations on Metal Catalysts. 37. On the Influence of the Loading on Activity and Selectivity of Supported Nickel Catalysts Strong metal-support interactions effect a distinct decrease of the hydrogenolysis activity. They can be detected with diminishing metal loading in the following order: Ni/TiO₂ > Ni/Al₂O₃ > Ni/SiO₂. Strong metal-support interactions mean an influence on the electronic properties of the metal crystallites. On the other hand a mechanical mixture of nickel and η-Al₂O₃ is more active in hydrogenolysis than nickel.