Über eine neue kristalline Kieselsäure der Zusammensetzung H2Si14O29 · 5 H2O mit Schichtstruktur und Befähigung zur Bildung von Intercalationsverbindungen / A Crystalline Silicic Acid H2Si14O29 · 5 H2O with Layer Structure and Capability of Formation of Intercalation Compounds

Abstract

A crystalline silicic acid H2Si14O29 · 5H2O has been prepared by topochemical reaction of sodium silicate Na2Si14O29·12H2O with acids. The compound has a layer structure with silicate sheets of about 11.2 Å thickness. The layer structure is clearly established by two dimensional reactions, mainly the formation of intercalation compounds with X-oxides (dimethylsulfoxide, pyridine-N-oxides etc.), acid amides, urea and its derivatives and bases such as hydrazine and pyridine. Typical exemples are 2 (CH3)2SO · H2Si14O29, 2C5H5NO · H2Si14O29, 2, 7 HCONHCH3 · H2Si14O29; 2, 3 HCON (CH3)2 · H2Si14O29; 1, 6 HCONHC2H5 · H2Si14O29; 1, 6 HCON (C2H5)2 · H2Si14O29.