Lipophilic Di- and Triamides as Ionophores for Alkaline Earth Metal Cations

Different electrically neutral lipophilic di- and triamides were prepared and their ion selectivity in membranes studied. In membranes the ionophore N, N′-diheptyl-N, N′-dimethyl-succinamide prefers Ca²⁺ over Mg²⁺ by a factor of 20 but rejects Na⁺ and K⁺ in respect to Mg²⁺ by a factor of 100 and 10, respectively. This selectivity suffices to perform useful intracellular Mg²⁺ activity studies.     

The scattering of classical waves from inhomogeneous media

By extending Kato's theory of two Hilbert space scattering, we are able to formulate both optical and accoustical scattering from inhomogeneous media as strictly elliptic problems. We use this formulation to present simple proofs of the existence and completeness of scattering states.     

Korrelation von IR.-Absorptiosfrequenzen der Silbersalze von Carbonsäuren mit Substituentenkonstanten

A correlation of TAFT' s substituent constants σ* with the asymmetric stretching vibration of the carboxylate group of 24 silver salts of carboxylic acids shows that σ*-values may be determined with a standard deviation of about 0.1 using IR. absorption data.     

Coordinating sites in non-cyclic neutral ionophores determined by Mn2+ induced 13C-spin-lattice relaxation

¹³C-Spin-lattice relaxation times induced by Mn²⁺ were measured for some ionophores and interpreted in terms of the ion-ligand interaction and position of the metal ion relative to the carbon atoms.     

Angaben zur Bildung von stereospezifischen Katalysatoren

Ohne ZusammenfassungMit 12 Abbildungen