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Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals

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Solvothermal aluminophosphate zeotype synthesis with ionic liquid precursors.

David S Wragg¹, Grace M Fullerton, Peter J Byrne

¹School of Chemistry, University of St Andrews, St Andrews, Fife, UK KY16 9ST. david.wragg@smn.uio.no

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|March 25, 2011

Summary

Ionic liquids and amines are effective in aluminophosphate framework synthesis. Fluoride ions dictate framework formation, leading to novel materials and layered structures.

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Area of Science:

Materials Science
Inorganic Chemistry
Crystallography

Background:

Aluminophosphate frameworks are versatile materials with diverse applications.
Amine-based ionic liquids and parent amines serve as effective solvents and structure-directing agents in framework synthesis.

Purpose of the Study:

To investigate the role of amine-based ionic liquids and parent amines in aluminophosphate framework synthesis.
To explore the influence of fluoride ions on the resulting framework structures.
To report the synthesis and crystal structures of novel aluminophosphate materials.

Main Methods:

Utilizing amine-based ionic liquids and their parent amines as solvents and templates.
Conducting synthesis with and without fluoride ions (from hydrofluoric acid).
Employing X-ray diffraction for crystal structure determination.

Main Results:

In the presence of fluoride ions, ionic liquids and parent amines yield identical aluminophosphate frameworks.
Without fluoride ions, the synthesis products are unrelated to the directing agents.
A novel extra-large pore aluminophosphate material was synthesized using 1-methylpyrrolidine.
The relationship between the novel material and sodalite structures was elucidated.
Crystal structures of two new layered aluminophosphate materials were determined.

Conclusions:

Fluoride ions are crucial for directing the formation of specific aluminophosphate frameworks when using amine-based ionic liquids and parent amines.
1-methylpyrrolidine facilitates the synthesis of a unique extra-large pore material and related sodalite structures.
The study expands the library of known aluminophosphate materials with the discovery of new layered structures.