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Crystals 2014, 4(1), 64-73; doi:10.3390/cryst4010064
Article

Polyoxotungstates in Molecular Boxes of Purine Bases

 and *
Department für Chemie, Institut für Anorganische Chemie, Universität zu Köln, Greinstraße 6, Köln D-50939, Germany
* Author to whom correspondence should be addressed.
Received: 31 December 2013 / Revised: 17 February 2014 / Accepted: 20 February 2014 / Published: 12 March 2014
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Abstract

Three new compounds, (GuaH)4[W10O32](H2O)4 (1), (ThbH)3(H3O)[(W10O32](H2O)7.5 (2) and (ThbH)2[W6O19](H2O)2 (3) (GuaH = guaninium, thbH = theobrominium) were synthesized in acidified acetonitrile solutions. The polyoxotungstates in all of these compounds are surrounded by an organic matrix consisting of protonated purine bases and water molecules. The distinctive structural arrangement of the aromatic organic cations around the polyoxoanions parallel to their faces is reminiscent of nanosized boxes. The results of IR spectroscopy are consistent with previously reported results for polyoxotungstates and neat organic compounds. The polyoxoanions are reduced to tungsten(IV) oxide upon heating over 400 °C in an intramolecular redox reaction.
Keywords: polyoxometalates; purines; non-covalent interactions; tungsten polyoxometalates; purines; non-covalent interactions; tungsten
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kulikov, V.; Meyer, G. Polyoxotungstates in Molecular Boxes of Purine Bases. Crystals 2014, 4, 64-73.

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