Tungsten Oxide Layer

The compounds of comprise tungsten oxide layers which have a base inserted between the metal oxide layers and directly coordinated to tungsten. Unlike the metal chalcogenides employed in intercalation compounds, commercially obtainable H2WO4 may be used as a starting material without any pretreatment such as heat annealing or a preliminary interaction with ammonia.

It has been discovered that tungsten trioxide hydrate or tungstic acid can react with bases to form new compounds having a unique layered structure. The novel composition of matter comprises layered compounds of the formula LWO3 where L is a Lewis base containing nitrogen or oxygen electron donors and selected from the group consisting of 5-membered heterocyclic amines, 6-membered heterocyclic amines, amine oxides, triorganophosphates, phosphine oxides and sulfoxides, the layered compounds being characterized in that L is covalently bound to a tungsten atom in the tungsten oxide layer.

In the compounds, a neutral Lewis base, such as pyridine, is strongly coordinated to a tungsten atom in the manner of a molecular coordination complex, e.g. WCl4 py2. But the compounds of the invention are not molecular coordination complexes, as they possess an infinitely connected two-dimensional layered structure.

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