Hydrothermal reversible interconversion of two zincophosphates with three-dimensional open frameworks containing diprotonated 1,4-diazacycloheptane molecules
- Institut fuer Anorganische Chemie, Universitaet Hannover, Callinstrasse 9, D-30167 Hannover (Germany)
- Universitaet Konstanz, Fachbereich Chemie, D-78457 Konstanz (Germany)
A new zincophosphate (ZnPO) (C{sub 5}H{sub 14}N{sub 2})[Zn{sub 2}(HPO{sub 4}){sub 3}] (I), has been synthesized in the presence of 1,4-diazacycloheptane under mild hydrothermal conditions (160{sup o}C) and the crystal structure determined by single-crystal X-ray crystallography. Corner-sharing ZnO{sub 4} and HPO{sub 4} tetrahedra are arranged into layers that are based on the 2D, three-connected 4.8{sup 2} net and linked together by tetrahedral HPO{sub 4} pillars into the 3D interrupted open framework. The 3D intersecting channel system is filled with diprotonated amine molecules. It has been observed that I forms via hydrothermal transformation of a known ZnPO hydrate (C{sub 5}H{sub 14}N{sub 2})[Zn{sub 2}(HPO{sub 4}){sub 3}].H{sub 2}O (II), with a closely related 3D open-framework structure, involving dehydration and reconstruction of Zn-O-P linkages. Interestingly, this transformation is completely reversible under hydrothermal conditions at temperatures between 100 and 160{sup o}C with II and I being stable at low and high temperature, respectively. Also, I and II can be interconverted via solid-gas reactions. Crystal data for I: Orthorhombic, space group Pca2{sub 1}, Z=16, a=14.6595(9), b=14.557(1), c=28.114(2)A, T=298K.
- OSTI ID:
- 20725825
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 3 Vol. 178; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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