Crystal Structure, Vibrational, Spectroscopic and Thermochemical Properties of Double Sulfate Crystalline Hydrate [CsEu(H2O)3(SO4)2]•H2O and Its Thermal Dehydration Product CsEu(SO4)2

Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)(3)(SO4)(2)]center dot H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs(+):1Eu(3+):2SO(4)(2-) ions. Anhydrous salt CsEu(SO4)(2) was formed as a result of the thermal dehydration of the crystallohydrate. The unusual effects observed during the thermal dehydration were attributed to the specific coordination of water molecules in the [CsEu(H2O)(3)(SO4)(2)]center dot H2O structure. The crystal structure of [CsEu(H2O)(3)(SO4)(2)]center dot H2O was determined by a single crystal X-ray diffraction analysis, and the crystal structure of CsEu(SO4)(2) was obtained by the Rietveld method. [CsEu(H2O)(3)(SO4)(2)]center dot H2O crystallizes in the monoclinic system, space group P2(1)/c (a = 6.5574(1) angstrom, b = 19.0733(3) angstrom, c = 8.8364(2) angstrom, beta = 93.931(1)degrees, V = 1102.58(3) angstrom 3). The anhydrous sulfate CsEu(SO4)(2) formed as a result of the thermal destruction crystallizes in the monoclinic system, space group C2/c (a = 14.327(1) angstrom, b = 5.3838(4) angstrom, c = 9.5104(6) angstrom, beta = 101.979(3)degrees, V = 717.58(9) angstrom 3). The vibration properties of the compounds are fully consistent with the structural models and are mainly determined by the deformation of non-rigid structural elements, such as H2O and SO42-. As shown by the diffused reflection spectra measurements and DFT calculations, the structural transformation from [CsEu(H2O)(3)(SO4)(2)]center dot H2O to CsEu(SO4)(2) induced a significant band gap reduction. A noticeable difference of the luminescence spectra between cesium europium sulfate and cesium europium sulfate hydrate is detected and explained by the variation of the extent of local symmetry violation at the crystallographic sites occupied by Eu3+ ions, namely, by the increase in inversion asymmetry in [CsEu(H2O)(3)(SO4)(2)]center dot H2O and the increase in mirror asymmetry in CsEu(SO4)(2). The chemical shift of the D-5(0) energy level in cesium europium sulfate hydrate, with respect to cesium europium sulfate, is associated with the presence of H2O molecules in the vicinity of Eu3+ ion.

Automated summary

This study synthesized a crystalline hydrate of double cesium europium sulfate and observed unusual effects during its thermal dehydration process, attributed to the specific coordination of water molecules. The crystal structures were determined through X-ray diffraction and Rietveld method analysis, revealing differences between the two crystal structures.