Hydrothermal reversible interconversion of two zincophosphates with three-dimensional open frameworks containing diprotonated 1,4-diazacycloheptane molecules

被引：5
作者：
Wiebcke, M
Kühn, C
Wildermuth, G
机构：
[1] Leibniz Univ Hannover, Inst Anorgan Chem, D-30167 Hannover, Germany
[2] Univ Konstanz, Fachbereich Chem, D-78457 Constance, Germany
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2005年 / 178卷 / 03期
关键词：
zincophosphate; 1,4-diazacycloheptane; crystal structure; phase transformation; hydrothermal synthesis;
D O I：
10.1016/j.jssc.2004.12.026
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A new zincophosphate (ZnPO), (C5H14N2)[Zn-2(HPO4)(3)] (I), has been synthesized in the presence of 1,4-diazacycloheptane under mild hydrothermal conditions (160 degrees C) and the crystal structure determined by single-crystal X-ray crystallography. Corner-sharing ZnO4 and HPO4 tetrahedra are arranged into layers that are based on the 2D, three-connected 4.8(2) net and linked together by tetrahedral HPO4 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, (C5H14N2)[Zn-2(HPO4)(3)] center dot H2O (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 degrees 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(1), Z = 16, a = 14.6595(9), b = 14.557(1), c = 28.114(2)angstrom, T = 298 K. (c) 2005 Elsevier Inc. Ail rights reserved.
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页码：694 / 701
页数：8
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