Abstract
A new zincophosphate (ZnPO), (C 5H 14N 2)[Zn 2(HPO 4) 3] ( I), has been synthesized in the presence of 1,4-diazacycloheptane under mild hydrothermal conditions (160 °C) and the crystal structure determined by single-crystal X-ray crystallography. Corner-sharing ZnO 4 and HPO 4 tetrahedra are arranged into layers that are based on the 2D, three-connected 4.8 2 net and linked together by tetrahedral HPO 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 5H 14N 2)[Zn 2(HPO 4) 3]·H 2O ( 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 °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 Pca 2 1 , Z = 16 , a = 14.6595 ( 9 ) , b = 14.557 ( 1 ) , c = 28.114 ( 2 ) Å , T = 298 K .
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