Die Bildung von Tetrαchlorocobaltat in Abhängigkeit vom Lösungsmittel

Formation of Tetrachloro Cobaltate in Dependence of the Solvent The individual complex formation constants and thermodynamic data for the reaction have been determined spectrophotometrically at different temperatures and ionic strengths in the following solvents (L): nitromethane, benzonitrile, acetonitrile, acetone, dimethylformamide, and dimethylacetamide. For solutions of tetrabutylammonium salts activities have been calculated up to total electrolyte concentrations of ≈? 10^?1 mol/liter. The molar absorptivities for both the tri- and the tetrachlorocomplex depend on the solvent; the free enthalpies are related to the solvent donicities.     

Abh?ngigkeit der Fluoreszenzquantenausbeute von substituierten Stilbenen vom L?sungsmittel und von der Temperatur

Ohne Zusammenfassung     

Notiz über die Reaktion von Methylhydrazin mit N-Cyano-azomethinen. Abhängigkeit des Reaktionsverlaufs von der Natur der Abgangsgruppe

The reaction of methylhydrazine with N-cyanoazomethines 1 containing a thioalkyl leaving group yields the 3-amino-1,2,4-triazole derivatives 2 , whereas the N-cyanoazomethines 1 containing an alkoxy leaving group give the isomeric 5-amino-1,2,4-triazoles 3. The yields are excellent and the position selectivity is high. The structures of the 1,2,4-triazole derivatives were determined with the aid of proton-coupled ¹³C-NMR. spectra.     

Zur Abhängigkeit der Hydratation des CaO · Al2O3 von der Temperatur

On the Temperature Dependence of the Hydration of CaO · Al₂O₃ Using differential calorimetric analysis, ¹H-NMR spin-lattice-relaxation time measurements, and X-ray powder characterization of the hydration products it has been shown that the CaO · Al₂O₃ hydration in the range of 4 to 83°C proceeds via three different successively occurring principles.     

Bildung und Fällung von Bromocadmaten in Essigsäure als Lösungsmittel

Cadmium bromide reacts in anhydrous acetic acid solutions with acetyl bromide to form bromocadmates which can be precipitated as ammonium salts. By conductometric control and X-ray diffraction the phases (NH₄)(CdBr₃), (NH₄)₂ (CdBr₄) and (NH₄)₄(CdBr₆) have been found which decompose on heating as ordinary double salts to ammonium bromide and cadmium bromide.     

Die Darstellung von Schwefeltetrafluorid aus den Elementen bei tiefer Temperatur in einem inerten Lösungsmittel

The Preparation of Sulphur Tetrafluoride from the Elements at low Temperature in an Inert Solvent Pure sulphurtetrafluoride cna be prepared by the fluorination of elemental sulphur in CCl₃F at ?78°C in high yields.