Über basische Aluminiumsalze und ihre Lösungen. (XII). Vergleichende Untersuchungen an unterschiedlich dargestellten Basischen Aluminiumchloridlösungen

Abstract

Basische Aluminiumchloridlösungen wurden aus Lösungen des neutralen Salzes durch Zugabe von Lauge bzw. Auflösen von metallischem Aluminium hergestellt. Ihre Untersuchung mit der Ferronmethode und der 27Al‐Kernresonanz ergab in den Lösungen beider Darstellungsarten monomere, tridekamere und polymere Aluminiumkationen. Die tridekameren Ionen bilden sich bevorzugt bei niedriger Temperatur, geringen Basizitätsgraden und in verdünnter Lösung. Bei höheren Temperaturen und Basizitätsgraden werden sie in polymere und monomere Aluminiumformen umgewandelt.

Aluminum Compounds, Inorganic

“…In contrast to the aluminum chlorides of low basicity (below 65 %), the compounds of high basicity (above 65 %) do not crystallize from their aqueous solutions, but form glassy masses. When solutions in the basicity range 30 -65 % are evaporated, the compound Al 2 (OH) 3 [70][71][72][73]. Basic aluminum chlorides are mixtures of complex compounds of various degrees of polymerization.…”

“…Basic aluminum chlorides are mixtures of complex compounds of various degrees of polymerization. Spectroscopic and kinetic investigations of the basic aluminum chlorides and of their solutions [70][71][72][73] lead to the conclusion that the complex ion [Al 13 O 4 (OH) 24 (H 2 O) 12 ] 7þ is present and is in equilibrium with its polymeric forms. Variations observed in the properties of these aqueous solutions such as viscosity and pH are caused by polymerization and depolymerization [74].…”

Local Chemistry and Growth of Single Corrosion Pits in Aluminum

“…Aluminum oxychlorides have been prepared by chemical and electrochemical methods (6), and the physicochemical properties of their aqueous solutions have been studied over a broad range of concentrations and temperatures (7)(8)(9)(10). The existence of mononuclear and polynuclear hydroxyaluminum ions, as well as solid phases formed when a base is added to A1C13 solutions, has been demonstrated by UV spectroscopy by various authors (10)(11)(12)(13). In the present study, ferron (8-hydroxy-7iodo-5-quinoline sulfonic acid) was used to form aluminum-ferron complexes which were detected by UV spectroscopy (11,14).…”

Untitled

“…The aluminum cations A1O + isolated from HF solutions, in the form of BF 4- 4+ and more highly polymerized complexes, which are formed during aging of aqueous solutions of aluminates [52]. According to Raman scattering data [53] and NMR data [54][55][56][57][58][59][60][61][62][63][64] for the cation [A1 13 O 4 (OH) 25 (OH 2 ) 11 ], which forms soluble sulfate and chloride, and is stored in an aqueous solution. In the presence of HC1, it decomposes into smaller particles, but with the addition of alkalis, particles with higher molecular weight can be formed.…”